TY  - CONF
AU  - Jakovljević, Isidora
AU  - Spremić, Milan
AU  - Fric, Nenad
AU  - Marković, Zlatko
PY  - 2023
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3154
AB  - Implementation of demountable beams in steel-concrete composite floors enables
structure reuse during several life cycles, consequently leading to savings in material
consumption and reduction of emissions, providing overall ecological benefits.
The behaviour of the innovative demountable beam with a shear connection consisting
of headed studs and bolts is analysed in this paper. The proposed beam is
formed of a steel profile and a steel-concrete composite slab cast in open trough
profiled steel sheeting. Headed studs, welded to the additional steel angles, are
placed in sheeting ribs, whereas bolts are installed between ribs, connecting the
steel angles and profile flange. A numerical FE model of a full-scale steel-concrete
composite beam has been developed to analyse the beam behaviour under service
loads. Experimental results of push-out tests have been used to describe the loadslip
behaviour of headed studs, whereas bolt response has been simulated according
to the experimental investigations of lap joints with preloaded bolts and oversize
holes. The parametric study has been conducted by varying the bolt diameter, grade
and bolt hole size. The results have validated the applicability of the proposed system,
confirming the fulfilment of serviceability limit state requirements.
PB  - Ernst & Sohn GmbH
C3  - ce/papers
T1  - Behaviour of demountable steel-concrete composite beams with bolts and headed studs
EP  - 89
IS  - 3-4
SP  - 84
VL  - 6
DO  - 10.1002/cepa.2399
ER  - 

@conference{
author = "Jakovljević, Isidora and Spremić, Milan and Fric, Nenad and Marković, Zlatko",
year = "2023",
abstract = "Implementation of demountable beams in steel-concrete composite floors enables
structure reuse during several life cycles, consequently leading to savings in material
consumption and reduction of emissions, providing overall ecological benefits.
The behaviour of the innovative demountable beam with a shear connection consisting
of headed studs and bolts is analysed in this paper. The proposed beam is
formed of a steel profile and a steel-concrete composite slab cast in open trough
profiled steel sheeting. Headed studs, welded to the additional steel angles, are
placed in sheeting ribs, whereas bolts are installed between ribs, connecting the
steel angles and profile flange. A numerical FE model of a full-scale steel-concrete
composite beam has been developed to analyse the beam behaviour under service
loads. Experimental results of push-out tests have been used to describe the loadslip
behaviour of headed studs, whereas bolt response has been simulated according
to the experimental investigations of lap joints with preloaded bolts and oversize
holes. The parametric study has been conducted by varying the bolt diameter, grade
and bolt hole size. The results have validated the applicability of the proposed system,
confirming the fulfilment of serviceability limit state requirements.",
publisher = "Ernst & Sohn GmbH",
journal = "ce/papers",
title = "Behaviour of demountable steel-concrete composite beams with bolts and headed studs",
pages = "89-84",
number = "3-4",
volume = "6",
doi = "10.1002/cepa.2399"
}

Jakovljević, I., Spremić, M., Fric, N.,& Marković, Z.. (2023). Behaviour of demountable steel-concrete composite beams with bolts and headed studs. in ce/papers
Ernst & Sohn GmbH., 6(3-4), 84-89.
https://doi.org/10.1002/cepa.2399

Jakovljević I, Spremić M, Fric N, Marković Z. Behaviour of demountable steel-concrete composite beams with bolts and headed studs. in ce/papers. 2023;6(3-4):84-89.
doi:10.1002/cepa.2399 .

Jakovljević, Isidora, Spremić, Milan, Fric, Nenad, Marković, Zlatko, "Behaviour of demountable steel-concrete composite beams with bolts and headed studs" in ce/papers, 6, no. 3-4 (2023):84-89,
https://doi.org/10.1002/cepa.2399 . .

TY  - JOUR
AU  - Filipović, Aljoša
AU  - Dobrić, Jelena
AU  - Buđevac, Dragan
AU  - Fric, Nenad
AU  - Baddoo, Nancy
PY  - 2021
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2395
AB  - Substantial research has been conducted in the last years into the structural responses of cold-formed and hot-rolled stainless steel equal-leg angle columns, whereas there is no experimental data on laser-welded stainless steel angle columns despite these sections being increasingly used in the modern construction industry. To fill this gap and provide benchmarks for design, a comprehensive experimental investigation into the structural strength and stability of laser-welded austenitic stainless steel equal-leg angle columns under pure axial compression was performed and described in this paper. A series of laboratory tests, performing on two test groups of specimens with nominal dimensions of 60 × 60 × 6 mm and 100 × 100 × 10 mm and different lengths, involved 6 stub column tests and 20 global buckling tests together with measurements on material properties, initial local geometric imperfections and residual stresses. The experimental observations reveal that the column ultimate capacity and prevalent failure mode — major-axis flexural-torsional buckling and minor-axis flexural buckling — are highly dependent on the column slenderness and initial imperfections. The full load-lateral displacement, load-torsional rotation and load-axial strain responses of the specimens were fully reported and discussed. The results were employed to evaluate the accuracy of the current European and North American stainless steel design standards. The evaluation results revealed that the codified design procedures yield conservative resistance predictions of laser-welded stainless steel equal-leg angle columns, showing a prospective for their modification and improvement by providing more optimized and realistic results in design considering the actual residual stress distributions, material nonlinearity and strain hardening.
T2  - Thin-Walled Structures
T1  - Experimental study of laser-welded stainless steel angle columns
IS  - 164
DO  - 10.1016/j.tws.2021.107777
ER  - 

@article{
author = "Filipović, Aljoša and Dobrić, Jelena and Buđevac, Dragan and Fric, Nenad and Baddoo, Nancy",
year = "2021",
abstract = "Substantial research has been conducted in the last years into the structural responses of cold-formed and hot-rolled stainless steel equal-leg angle columns, whereas there is no experimental data on laser-welded stainless steel angle columns despite these sections being increasingly used in the modern construction industry. To fill this gap and provide benchmarks for design, a comprehensive experimental investigation into the structural strength and stability of laser-welded austenitic stainless steel equal-leg angle columns under pure axial compression was performed and described in this paper. A series of laboratory tests, performing on two test groups of specimens with nominal dimensions of 60 × 60 × 6 mm and 100 × 100 × 10 mm and different lengths, involved 6 stub column tests and 20 global buckling tests together with measurements on material properties, initial local geometric imperfections and residual stresses. The experimental observations reveal that the column ultimate capacity and prevalent failure mode — major-axis flexural-torsional buckling and minor-axis flexural buckling — are highly dependent on the column slenderness and initial imperfections. The full load-lateral displacement, load-torsional rotation and load-axial strain responses of the specimens were fully reported and discussed. The results were employed to evaluate the accuracy of the current European and North American stainless steel design standards. The evaluation results revealed that the codified design procedures yield conservative resistance predictions of laser-welded stainless steel equal-leg angle columns, showing a prospective for their modification and improvement by providing more optimized and realistic results in design considering the actual residual stress distributions, material nonlinearity and strain hardening.",
journal = "Thin-Walled Structures",
title = "Experimental study of laser-welded stainless steel angle columns",
number = "164",
doi = "10.1016/j.tws.2021.107777"
}

Filipović, A., Dobrić, J., Buđevac, D., Fric, N.,& Baddoo, N.. (2021). Experimental study of laser-welded stainless steel angle columns. in Thin-Walled Structures(164).
https://doi.org/10.1016/j.tws.2021.107777

Filipović A, Dobrić J, Buđevac D, Fric N, Baddoo N. Experimental study of laser-welded stainless steel angle columns. in Thin-Walled Structures. 2021;(164).
doi:10.1016/j.tws.2021.107777 .

Filipović, Aljoša, Dobrić, Jelena, Buđevac, Dragan, Fric, Nenad, Baddoo, Nancy, "Experimental study of laser-welded stainless steel angle columns" in Thin-Walled Structures, no. 164 (2021),
https://doi.org/10.1016/j.tws.2021.107777 . .

TY  - JOUR
AU  - Fric, Nenad
AU  - Veljković, Milan
AU  - Mišković, Zoran
AU  - Budjevac, Dragan
PY  - 2021
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2388
AB  - Slip-resistant shear connections with preloaded bolts have traditionally been used in steel
structures exposed to cyclic. Hence, shear load is transferred through friction surfaces
rather than through contact between the bolt surface and the hole. The main influencing
parameters determining slip resistance of the connection are the friction between contact
surfaces and the bolt preload level. This paper presents an experimental study of preloaded
bolted connections under cyclic load, the main objective being to investigate the influence
of cyclic load on the losses of preload force in high strength bolts and lock bolts.
T2  - GRAĐEVINAR
T1  - Experimental investigation of preload losses in high strength bolts under cyclic loading
IS  - 5
SP  - 453
SP  - 468
VL  - 73
DO  - 10.14256/JCE.3157.2021
ER  - 

@article{
author = "Fric, Nenad and Veljković, Milan and Mišković, Zoran and Budjevac, Dragan",
year = "2021",
abstract = "Slip-resistant shear connections with preloaded bolts have traditionally been used in steel
structures exposed to cyclic. Hence, shear load is transferred through friction surfaces
rather than through contact between the bolt surface and the hole. The main influencing
parameters determining slip resistance of the connection are the friction between contact
surfaces and the bolt preload level. This paper presents an experimental study of preloaded
bolted connections under cyclic load, the main objective being to investigate the influence
of cyclic load on the losses of preload force in high strength bolts and lock bolts.",
journal = "GRAĐEVINAR",
title = "Experimental investigation of preload losses in high strength bolts under cyclic loading",
number = "5",
pages = "453-468",
volume = "73",
doi = "10.14256/JCE.3157.2021"
}

Fric, N., Veljković, M., Mišković, Z.,& Budjevac, D.. (2021). Experimental investigation of preload losses in high strength bolts under cyclic loading. in GRAĐEVINAR, 73(5), 453.
https://doi.org/10.14256/JCE.3157.2021

Fric N, Veljković M, Mišković Z, Budjevac D. Experimental investigation of preload losses in high strength bolts under cyclic loading. in GRAĐEVINAR. 2021;73(5):453.
doi:10.14256/JCE.3157.2021 .

Fric, Nenad, Veljković, Milan, Mišković, Zoran, Budjevac, Dragan, "Experimental investigation of preload losses in high strength bolts under cyclic loading" in GRAĐEVINAR, 73, no. 5 (2021):453,
https://doi.org/10.14256/JCE.3157.2021 . .

TY  - CONF
AU  - Đokić, Đorđe
AU  - Filipović, Aljoša
AU  - Fric, Nenad
PY  - 2021
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2608
AB  - Rad prikazuje parametarsku analizu izvijanja uklještenih stubova industrijske hale uzimajući u 
obzir  i  postojanje  podužnog  krovnog  sprega.  Primenom  LBA  (Linear  Buckling  Analysis)  u 
prostornom  modelu  čelične  konstrukcije  određena  je  najpre  kritična  sila  izvijanja,  a  zatim  i 
koeficijent dužine izvijanja glavnih stubova industrijske hale. Analizom je obuhvaćeno osam 
različitih dispozicionih rešenja industrijske hale u smislu položaja podužnog krovnog sprega i 
vertikalnog sprega u kalkanu. U okviru svakog dispozicionog rešenja varirana je dužina hale. 
Razmatran je slučaj kada se spregovi projektuju tako da njihova ispuna može da prihvati  pritisak 
i zatazanje, kao i slučaj kada spreg čini ispuna koja prihvata samo sile zatezanja. Prikazana je 
vrednost  koeficijenta  dužine  izvijanja  glavnih  stubova  industrijske  hale  u  funkciji  uticajnih 
parametara.
AB  - This paper presents a parametric analysis of flexural buckling of cantilever columns of industrial 
hall with longitudinal roof bracing. Linear Buckling Analysis - LBA was performed in 3D hall 
model to determine critical buckling load and buckling coefficient of the main columns. The 
analysis included eight different industrial hall layouts in terms of longitudinal roof bracing and 
gable end bracing positions. Within each layout, the hall length was varied. Two cases of bracing 
structural behaviour were considered: bracing diagonals that can be loaded both in tension and 
compression and diagonals that can only be loaded in tension. Buckling coefficient values of the 
main columns of the industrial hall are presented in function of influencing parameters.
PB  - Univerzitet u Beogradu Građevinski fakultet
PB  - Društvo građevinskih konstruktera Srbije
C3  - Zbornik radova sa Nacionalnog simpozijuma DGKS  / Društvо  građevinskih konstruktera Srbije, Simpozijum 2020
T1  - Uticaj podužnog krovnog sprega na dužinu izvijanja glavnih stubova industrijske hale
EP  - 396
SP  - 389
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2608
ER  - 

@conference{
author = "Đokić, Đorđe and Filipović, Aljoša and Fric, Nenad",
year = "2021",
abstract = "Rad prikazuje parametarsku analizu izvijanja uklještenih stubova industrijske hale uzimajući u 
obzir  i  postojanje  podužnog  krovnog  sprega.  Primenom  LBA  (Linear  Buckling  Analysis)  u 
prostornom  modelu  čelične  konstrukcije  određena  je  najpre  kritična  sila  izvijanja,  a  zatim  i 
koeficijent dužine izvijanja glavnih stubova industrijske hale. Analizom je obuhvaćeno osam 
različitih dispozicionih rešenja industrijske hale u smislu položaja podužnog krovnog sprega i 
vertikalnog sprega u kalkanu. U okviru svakog dispozicionog rešenja varirana je dužina hale. 
Razmatran je slučaj kada se spregovi projektuju tako da njihova ispuna može da prihvati  pritisak 
i zatazanje, kao i slučaj kada spreg čini ispuna koja prihvata samo sile zatezanja. Prikazana je 
vrednost  koeficijenta  dužine  izvijanja  glavnih  stubova  industrijske  hale  u  funkciji  uticajnih 
parametara., This paper presents a parametric analysis of flexural buckling of cantilever columns of industrial 
hall with longitudinal roof bracing. Linear Buckling Analysis - LBA was performed in 3D hall 
model to determine critical buckling load and buckling coefficient of the main columns. The 
analysis included eight different industrial hall layouts in terms of longitudinal roof bracing and 
gable end bracing positions. Within each layout, the hall length was varied. Two cases of bracing 
structural behaviour were considered: bracing diagonals that can be loaded both in tension and 
compression and diagonals that can only be loaded in tension. Buckling coefficient values of the 
main columns of the industrial hall are presented in function of influencing parameters.",
publisher = "Univerzitet u Beogradu Građevinski fakultet, Društvo građevinskih konstruktera Srbije",
journal = "Zbornik radova sa Nacionalnog simpozijuma DGKS  / Društvо  građevinskih konstruktera Srbije, Simpozijum 2020",
title = "Uticaj podužnog krovnog sprega na dužinu izvijanja glavnih stubova industrijske hale",
pages = "396-389",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2608"
}

Đokić, Đ., Filipović, A.,& Fric, N.. (2021). Uticaj podužnog krovnog sprega na dužinu izvijanja glavnih stubova industrijske hale. in Zbornik radova sa Nacionalnog simpozijuma DGKS  / Društvо  građevinskih konstruktera Srbije, Simpozijum 2020
Univerzitet u Beogradu Građevinski fakultet., 389-396.
https://hdl.handle.net/21.15107/rcub_grafar_2608

Đokić Đ, Filipović A, Fric N. Uticaj podužnog krovnog sprega na dužinu izvijanja glavnih stubova industrijske hale. in Zbornik radova sa Nacionalnog simpozijuma DGKS  / Društvо  građevinskih konstruktera Srbije, Simpozijum 2020. 2021;:389-396.
https://hdl.handle.net/21.15107/rcub_grafar_2608 .

Đokić, Đorđe, Filipović, Aljoša, Fric, Nenad, "Uticaj podužnog krovnog sprega na dužinu izvijanja glavnih stubova industrijske hale" in Zbornik radova sa Nacionalnog simpozijuma DGKS  / Društvо  građevinskih konstruktera Srbije, Simpozijum 2020 (2021):389-396,
https://hdl.handle.net/21.15107/rcub_grafar_2608 .

TY  - CONF
AU  - Filipović, Aljoša
AU  - Dobrić, Jelena
AU  - Marković, Zlatko A.
AU  - Spremić, Milan B.
AU  - Fric, Nenad
AU  - Baddoo, Nancy
PY  - 2019
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1964
AB  - This paper presents the experimental programme of an extensive research project that deals with analysing the behaviour of compressed stainless steel columns with equal angle sections. The research focuses on different material and geometrical parameters of pin-ended angle columns produced from austenitic and lean-duplex stainless steel alloys. To assess the influences of initial imperfections on column compressive resistance caused by different manufacturing procedures, three types of angle products are included: cold-formed, hot-rolled and laser-welded sections. In order to obtain both elastic and inelastic ultimate responses, including flexural and torsional-flexural buckling modes, the lengths and cross-section geometries of specimens are selected to cover non-slender sections and slender sections covering the entire wide slenderness range. The experimental programme covers all relevant tests: 15 tensile coupon tests, 15 stub-column tests, 48 overall buckling tests on slender columns and 2 residual stress
tests, including measurements of initial geometric imperfections. The purpose of these experiments is to provide a reliable database to determine design rules for angle members and extend the scope of procedures currently codified in EN 1993-1-4 (2015), not only to conventional angle profiles, but also to contemporary products such as laser-welded angles.
C3  - International Colloquium on Stability and Ductility of Steel Structures
T1  - Experimental investigation of compressed stainless steel angle columns
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1964
ER  - 

@conference{
author = "Filipović, Aljoša and Dobrić, Jelena and Marković, Zlatko A. and Spremić, Milan B. and Fric, Nenad and Baddoo, Nancy",
year = "2019",
abstract = "This paper presents the experimental programme of an extensive research project that deals with analysing the behaviour of compressed stainless steel columns with equal angle sections. The research focuses on different material and geometrical parameters of pin-ended angle columns produced from austenitic and lean-duplex stainless steel alloys. To assess the influences of initial imperfections on column compressive resistance caused by different manufacturing procedures, three types of angle products are included: cold-formed, hot-rolled and laser-welded sections. In order to obtain both elastic and inelastic ultimate responses, including flexural and torsional-flexural buckling modes, the lengths and cross-section geometries of specimens are selected to cover non-slender sections and slender sections covering the entire wide slenderness range. The experimental programme covers all relevant tests: 15 tensile coupon tests, 15 stub-column tests, 48 overall buckling tests on slender columns and 2 residual stress
tests, including measurements of initial geometric imperfections. The purpose of these experiments is to provide a reliable database to determine design rules for angle members and extend the scope of procedures currently codified in EN 1993-1-4 (2015), not only to conventional angle profiles, but also to contemporary products such as laser-welded angles.",
journal = "International Colloquium on Stability and Ductility of Steel Structures",
title = "Experimental investigation of compressed stainless steel angle columns",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1964"
}

Filipović, A., Dobrić, J., Marković, Z. A., Spremić, M. B., Fric, N.,& Baddoo, N.. (2019). Experimental investigation of compressed stainless steel angle columns. in International Colloquium on Stability and Ductility of Steel Structures.
https://hdl.handle.net/21.15107/rcub_grafar_1964

Filipović A, Dobrić J, Marković ZA, Spremić MB, Fric N, Baddoo N. Experimental investigation of compressed stainless steel angle columns. in International Colloquium on Stability and Ductility of Steel Structures. 2019;.
https://hdl.handle.net/21.15107/rcub_grafar_1964 .

Filipović, Aljoša, Dobrić, Jelena, Marković, Zlatko A., Spremić, Milan B., Fric, Nenad, Baddoo, Nancy, "Experimental investigation of compressed stainless steel angle columns" in International Colloquium on Stability and Ductility of Steel Structures (2019),
https://hdl.handle.net/21.15107/rcub_grafar_1964 .

TY  - CONF
AU  - Filipović, Aljoša
AU  - Dobrić, Jelena
AU  - Marković, Zlatko
AU  - Buđevac, Dragan
AU  - Fric, Nenad
AU  - Spremić, Milan
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1650
PB  - Društvo građevinskih konstruktera Srbije, Beograd
C3  - ASES International congress proceedings / Association of Structural Engineers of Serbia, 15th Congress, September 6-8th, 2018, Zlatibor
T1  - Experimental investigation of compressed stainless steel angle columns
EP  - 644
SP  - 635
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1650
ER  - 

@conference{
author = "Filipović, Aljoša and Dobrić, Jelena and Marković, Zlatko and Buđevac, Dragan and Fric, Nenad and Spremić, Milan",
year = "2018",
publisher = "Društvo građevinskih konstruktera Srbije, Beograd",
journal = "ASES International congress proceedings / Association of Structural Engineers of Serbia, 15th Congress, September 6-8th, 2018, Zlatibor",
title = "Experimental investigation of compressed stainless steel angle columns",
pages = "644-635",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1650"
}

Filipović, A., Dobrić, J., Marković, Z., Buđevac, D., Fric, N.,& Spremić, M.. (2018). Experimental investigation of compressed stainless steel angle columns. in ASES International congress proceedings / Association of Structural Engineers of Serbia, 15th Congress, September 6-8th, 2018, Zlatibor
Društvo građevinskih konstruktera Srbije, Beograd., 635-644.
https://hdl.handle.net/21.15107/rcub_grafar_1650

Filipović A, Dobrić J, Marković Z, Buđevac D, Fric N, Spremić M. Experimental investigation of compressed stainless steel angle columns. in ASES International congress proceedings / Association of Structural Engineers of Serbia, 15th Congress, September 6-8th, 2018, Zlatibor. 2018;:635-644.
https://hdl.handle.net/21.15107/rcub_grafar_1650 .

Filipović, Aljoša, Dobrić, Jelena, Marković, Zlatko, Buđevac, Dragan, Fric, Nenad, Spremić, Milan, "Experimental investigation of compressed stainless steel angle columns" in ASES International congress proceedings / Association of Structural Engineers of Serbia, 15th Congress, September 6-8th, 2018, Zlatibor (2018):635-644,
https://hdl.handle.net/21.15107/rcub_grafar_1650 .

TY  - JOUR
AU  - Dobrić, Jelena
AU  - Marković, Zlatko
AU  - Buđevac, Dragan
AU  - Spremić, Milan
AU  - Fric, Nenad
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/966
AB  - Nowadays, the codified procedure for design of centrically compressed cold-formed stainless steel (CFSS) builtup members is absent in Europe. Besides, there are no published research information and experimental data in this structural area. This paper focuses on a comprehensive experimental investigation of closely spaced CFSS built-up columns and addresses their flexural buckling capacity about the minor principal axis. Two series with a total of 36 built-up members were assembled, each formed by two discontinuously and directly connected channel chords oriented back-to-back to form an I-section. The chords were press-braked from flat strips of austenitic stainless steel EN 1,4301 as non-slender channel sections. The chords were uniformly interconnected by bolts or by welds. To identify the effects of interconnection spacing on chords' composite action, the overall and chord slenderness ratios were varied. Material properties, cross-section response and initial imperfections were quantified before testing. As a result, the overall flexural buckling without any local-overall interactions was observed as the dominant failure mode. All findings were used in the accompanying paper [1] to establish qualitative data base through numerical simulations of flexural buckling tests. Additionally, a quantitative accuracy assessment of the design methods for carbon steel built-up columns provided in Eurocode and American Specification was reported on the basis of their ability to predict flexural buckling resistances of the tested columns. This enabled numerical parametric studies and proposing design rules for CFSS built-up columns with non-slender sections that capture interconnection shear stiffness, overall and chord slenderness ratio and strain hardening effects.
PB  - Elsevier Ltd
T2  - Journal of Constructional Steel Research
T1  - Resistance of cold-formed built-up stainless steel columns - Part I: Experiment
EP  - 572
SP  - 552
VL  - 145
DO  - 10.1016/j.jcsr.2018.02.026
ER  - 

@article{
author = "Dobrić, Jelena and Marković, Zlatko and Buđevac, Dragan and Spremić, Milan and Fric, Nenad",
year = "2018",
abstract = "Nowadays, the codified procedure for design of centrically compressed cold-formed stainless steel (CFSS) builtup members is absent in Europe. Besides, there are no published research information and experimental data in this structural area. This paper focuses on a comprehensive experimental investigation of closely spaced CFSS built-up columns and addresses their flexural buckling capacity about the minor principal axis. Two series with a total of 36 built-up members were assembled, each formed by two discontinuously and directly connected channel chords oriented back-to-back to form an I-section. The chords were press-braked from flat strips of austenitic stainless steel EN 1,4301 as non-slender channel sections. The chords were uniformly interconnected by bolts or by welds. To identify the effects of interconnection spacing on chords' composite action, the overall and chord slenderness ratios were varied. Material properties, cross-section response and initial imperfections were quantified before testing. As a result, the overall flexural buckling without any local-overall interactions was observed as the dominant failure mode. All findings were used in the accompanying paper [1] to establish qualitative data base through numerical simulations of flexural buckling tests. Additionally, a quantitative accuracy assessment of the design methods for carbon steel built-up columns provided in Eurocode and American Specification was reported on the basis of their ability to predict flexural buckling resistances of the tested columns. This enabled numerical parametric studies and proposing design rules for CFSS built-up columns with non-slender sections that capture interconnection shear stiffness, overall and chord slenderness ratio and strain hardening effects.",
publisher = "Elsevier Ltd",
journal = "Journal of Constructional Steel Research",
title = "Resistance of cold-formed built-up stainless steel columns - Part I: Experiment",
pages = "572-552",
volume = "145",
doi = "10.1016/j.jcsr.2018.02.026"
}

Dobrić, J., Marković, Z., Buđevac, D., Spremić, M.,& Fric, N.. (2018). Resistance of cold-formed built-up stainless steel columns - Part I: Experiment. in Journal of Constructional Steel Research
Elsevier Ltd., 145, 552-572.
https://doi.org/10.1016/j.jcsr.2018.02.026

Dobrić J, Marković Z, Buđevac D, Spremić M, Fric N. Resistance of cold-formed built-up stainless steel columns - Part I: Experiment. in Journal of Constructional Steel Research. 2018;145:552-572.
doi:10.1016/j.jcsr.2018.02.026 .

Dobrić, Jelena, Marković, Zlatko, Buđevac, Dragan, Spremić, Milan, Fric, Nenad, "Resistance of cold-formed built-up stainless steel columns - Part I: Experiment" in Journal of Constructional Steel Research, 145 (2018):552-572,
https://doi.org/10.1016/j.jcsr.2018.02.026 . .

TY  - CONF
AU  - Spremić, Milan
AU  - Fric, Nenad
AU  - Marković, Zlatko
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1594
PB  - Društvo građevinskih konstruktera Srbije, Beograd
C3  - Zbornik radova sa nacionalnog kongresa DGKS / Društvо građevinskih konstruktera Srbije, 15. kongres, 6-8. septembar 2018, Zlatibor
T1  - Moždanici sa glavom mogućnosti i ograničenja primene u zgradarstvu
EP  - 323
SP  - 316
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1594
ER  - 

@conference{
author = "Spremić, Milan and Fric, Nenad and Marković, Zlatko",
year = "2018",
publisher = "Društvo građevinskih konstruktera Srbije, Beograd",
journal = "Zbornik radova sa nacionalnog kongresa DGKS / Društvо građevinskih konstruktera Srbije, 15. kongres, 6-8. septembar 2018, Zlatibor",
title = "Moždanici sa glavom mogućnosti i ograničenja primene u zgradarstvu",
pages = "323-316",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1594"
}

Spremić, M., Fric, N.,& Marković, Z.. (2018). Moždanici sa glavom mogućnosti i ograničenja primene u zgradarstvu. in Zbornik radova sa nacionalnog kongresa DGKS / Društvо građevinskih konstruktera Srbije, 15. kongres, 6-8. septembar 2018, Zlatibor
Društvo građevinskih konstruktera Srbije, Beograd., 316-323.
https://hdl.handle.net/21.15107/rcub_grafar_1594

Spremić M, Fric N, Marković Z. Moždanici sa glavom mogućnosti i ograničenja primene u zgradarstvu. in Zbornik radova sa nacionalnog kongresa DGKS / Društvо građevinskih konstruktera Srbije, 15. kongres, 6-8. septembar 2018, Zlatibor. 2018;:316-323.
https://hdl.handle.net/21.15107/rcub_grafar_1594 .

Spremić, Milan, Fric, Nenad, Marković, Zlatko, "Moždanici sa glavom mogućnosti i ograničenja primene u zgradarstvu" in Zbornik radova sa nacionalnog kongresa DGKS / Društvо građevinskih konstruktera Srbije, 15. kongres, 6-8. septembar 2018, Zlatibor (2018):316-323,
https://hdl.handle.net/21.15107/rcub_grafar_1594 .

TY  - CONF
AU  - Radovanović, Dunja
AU  - Fric, Nenad
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1950
AB  - It is very important to protect steel structures against the influence of corrosion since it is one of the two biggest defects of steel structures. In addition to hot-dip galvanizing, coating is the most commonly used system for the protection of steel structures against corrosion. It is practically irreplaceable in cases where use of the hot-dip galvanizing is not possible. In this paper all relevant standards, with emphasis on SRPS EN ISO 12944 as most important for coatings usage, are shown. Terms of corrosivity categories, methods and preparation grades of steel surfaces, methods for coatings applying and measurement of their thickness, as well as which coatings type can be used for corrosion protection of steel structures are explained
C3  - 15th Congress of the Associatin of structural engineers of Serbia - ASES
T1  - Sistemi antikorozivne zaštite čeličnih konstrukcija prema standardu EN ISO 12944
T1  - Steel structure corrosion protection systems according to the EN ISO 12944 standards
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1950
ER  - 

@conference{
author = "Radovanović, Dunja and Fric, Nenad",
year = "2018",
abstract = "It is very important to protect steel structures against the influence of corrosion since it is one of the two biggest defects of steel structures. In addition to hot-dip galvanizing, coating is the most commonly used system for the protection of steel structures against corrosion. It is practically irreplaceable in cases where use of the hot-dip galvanizing is not possible. In this paper all relevant standards, with emphasis on SRPS EN ISO 12944 as most important for coatings usage, are shown. Terms of corrosivity categories, methods and preparation grades of steel surfaces, methods for coatings applying and measurement of their thickness, as well as which coatings type can be used for corrosion protection of steel structures are explained",
journal = "15th Congress of the Associatin of structural engineers of Serbia - ASES",
title = "Sistemi antikorozivne zaštite čeličnih konstrukcija prema standardu EN ISO 12944, Steel structure corrosion protection systems according to the EN ISO 12944 standards",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1950"
}

Radovanović, D.,& Fric, N.. (2018). Sistemi antikorozivne zaštite čeličnih konstrukcija prema standardu EN ISO 12944. in 15th Congress of the Associatin of structural engineers of Serbia - ASES.
https://hdl.handle.net/21.15107/rcub_grafar_1950

Radovanović D, Fric N. Sistemi antikorozivne zaštite čeličnih konstrukcija prema standardu EN ISO 12944. in 15th Congress of the Associatin of structural engineers of Serbia - ASES. 2018;.
https://hdl.handle.net/21.15107/rcub_grafar_1950 .

Radovanović, Dunja, Fric, Nenad, "Sistemi antikorozivne zaštite čeličnih konstrukcija prema standardu EN ISO 12944" in 15th Congress of the Associatin of structural engineers of Serbia - ASES (2018),
https://hdl.handle.net/21.15107/rcub_grafar_1950 .

TY  - CONF
AU  - Radovanović, Dunja
AU  - Fric, Nenad
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1949
AB  - Hot-dip galvanizing is one of the most commonly used systems for the corrosion protection of steel structures. In cases where there are no restrictions for the application of hot-dip galvanizing, this procedure is the most economical solution because it offers permanent protection against
corrosion that does not require maintenance during the structure’s exploitation. In this paper, we present the process of hot-dip galvanizing with an emphasis on its specificities, capabilities and limitations. Particular attention is paid to the process of preparing steel structures for hot-dip
galvanizing as well as describing the acceptable quality of the finished product. The paper presents the possibilities and capacities of all hot-dip galvanizing companies in Serbia and in the region.
C3  - 15th Congress of the Associatin of structural engineers of Serbia - ASES
T1  - Toplo cinkovanje čeličnih konstrukcija - mogućnosti i ograničenja
T1  - Hot-dip galvanizing of steel structures - possibilities and limitations
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1949
ER  - 

@conference{
author = "Radovanović, Dunja and Fric, Nenad",
year = "2018",
abstract = "Hot-dip galvanizing is one of the most commonly used systems for the corrosion protection of steel structures. In cases where there are no restrictions for the application of hot-dip galvanizing, this procedure is the most economical solution because it offers permanent protection against
corrosion that does not require maintenance during the structure’s exploitation. In this paper, we present the process of hot-dip galvanizing with an emphasis on its specificities, capabilities and limitations. Particular attention is paid to the process of preparing steel structures for hot-dip
galvanizing as well as describing the acceptable quality of the finished product. The paper presents the possibilities and capacities of all hot-dip galvanizing companies in Serbia and in the region.",
journal = "15th Congress of the Associatin of structural engineers of Serbia - ASES",
title = "Toplo cinkovanje čeličnih konstrukcija - mogućnosti i ograničenja, Hot-dip galvanizing of steel structures - possibilities and limitations",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1949"
}

Radovanović, D.,& Fric, N.. (2018). Toplo cinkovanje čeličnih konstrukcija - mogućnosti i ograničenja. in 15th Congress of the Associatin of structural engineers of Serbia - ASES.
https://hdl.handle.net/21.15107/rcub_grafar_1949

Radovanović D, Fric N. Toplo cinkovanje čeličnih konstrukcija - mogućnosti i ograničenja. in 15th Congress of the Associatin of structural engineers of Serbia - ASES. 2018;.
https://hdl.handle.net/21.15107/rcub_grafar_1949 .

Radovanović, Dunja, Fric, Nenad, "Toplo cinkovanje čeličnih konstrukcija - mogućnosti i ograničenja" in 15th Congress of the Associatin of structural engineers of Serbia - ASES (2018),
https://hdl.handle.net/21.15107/rcub_grafar_1949 .

TY  - CONF
AU  - Fric, Nenad
AU  - Buđevac, Dragan
AU  - Mišković, Zoran
AU  - Marković, Zlatko
AU  - Dobrić, Jelena
PY  - 2016
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1484
PB  - Univerzitet Crne Gore, Građevinski fakultet, Podgorica
C3  - Zbornik radova / Šesti Internacionalni naučno-stručni skup Građevinarstvo - nauka i praksa, Žabljak, 7-11. 03. 2016
T1  - Usage Of Zinc-Silicate Primers In Friction Connections
EP  - 628
SP  - 621
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1484
ER  - 

@conference{
author = "Fric, Nenad and Buđevac, Dragan and Mišković, Zoran and Marković, Zlatko and Dobrić, Jelena",
year = "2016",
publisher = "Univerzitet Crne Gore, Građevinski fakultet, Podgorica",
journal = "Zbornik radova / Šesti Internacionalni naučno-stručni skup Građevinarstvo - nauka i praksa, Žabljak, 7-11. 03. 2016",
title = "Usage Of Zinc-Silicate Primers In Friction Connections",
pages = "628-621",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1484"
}

Fric, N., Buđevac, D., Mišković, Z., Marković, Z.,& Dobrić, J.. (2016). Usage Of Zinc-Silicate Primers In Friction Connections. in Zbornik radova / Šesti Internacionalni naučno-stručni skup Građevinarstvo - nauka i praksa, Žabljak, 7-11. 03. 2016
Univerzitet Crne Gore, Građevinski fakultet, Podgorica., 621-628.
https://hdl.handle.net/21.15107/rcub_grafar_1484

Fric N, Buđevac D, Mišković Z, Marković Z, Dobrić J. Usage Of Zinc-Silicate Primers In Friction Connections. in Zbornik radova / Šesti Internacionalni naučno-stručni skup Građevinarstvo - nauka i praksa, Žabljak, 7-11. 03. 2016. 2016;:621-628.
https://hdl.handle.net/21.15107/rcub_grafar_1484 .

Fric, Nenad, Buđevac, Dragan, Mišković, Zoran, Marković, Zlatko, Dobrić, Jelena, "Usage Of Zinc-Silicate Primers In Friction Connections" in Zbornik radova / Šesti Internacionalni naučno-stručni skup Građevinarstvo - nauka i praksa, Žabljak, 7-11. 03. 2016 (2016):621-628,
https://hdl.handle.net/21.15107/rcub_grafar_1484 .

TY  - JOUR
AU  - Fric, Nenad
AU  - Buđevac, Dragan
AU  - Mišković, Zoran
AU  - Marković, Zlatko
AU  - Dobrić, Jelena
PY  - 2016
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/782
AB  - Usage of zinc-silicate coatings as anti-corrosive protection of friction connections results in reduction of construction time and provides protection from corrosion. Such protection system has a number of advantages in respect to the widely implemented metallization procedure, prevalently in terms of speed of implementation, required training of the workforce and cost. In this paper were pre- sented friction coefficients for different systems of anti-corrosive protection of friction connections, with emphasis on the zinc-silicate coatings and their technical characteristics and implementation methods.
AB  - Primenom cink-silikatnih premaza kao antikorozione zaštite tarnih površina skraćuje se vreme izgradnje konstrukcija i obezbeđuje zaštita od korozije. Ovakav sistem zaštite ima niz prednosti u odnosu na široko primenjivan postupak metalizacije, pre svega u smislu brzine sprovođenja, zahtevane kvalifikovanosti radne snage i cene. U ovom radu prikazani su koeficijenti trenja za različite sisteme antikorozione zaštite tarnih spojeva, sa akcentom na cink-silikatne premaze i njihove tehničke karakteristike i način primene.
PB  - Institut za istraživanja i projektovanja u privredi, Beograd
T2  - Journal of Applied Engineering Science
T1  - Usage of zinc-silicate coatings in friction connections
T1  - Primena cink-silikatnih premaza u tarnim spojevima
EP  - 134
IS  - 1
SP  - 128
VL  - 14
DO  - 10.5937/jaes14-10450
ER  - 

@article{
author = "Fric, Nenad and Buđevac, Dragan and Mišković, Zoran and Marković, Zlatko and Dobrić, Jelena",
year = "2016",
abstract = "Usage of zinc-silicate coatings as anti-corrosive protection of friction connections results in reduction of construction time and provides protection from corrosion. Such protection system has a number of advantages in respect to the widely implemented metallization procedure, prevalently in terms of speed of implementation, required training of the workforce and cost. In this paper were pre- sented friction coefficients for different systems of anti-corrosive protection of friction connections, with emphasis on the zinc-silicate coatings and their technical characteristics and implementation methods., Primenom cink-silikatnih premaza kao antikorozione zaštite tarnih površina skraćuje se vreme izgradnje konstrukcija i obezbeđuje zaštita od korozije. Ovakav sistem zaštite ima niz prednosti u odnosu na široko primenjivan postupak metalizacije, pre svega u smislu brzine sprovođenja, zahtevane kvalifikovanosti radne snage i cene. U ovom radu prikazani su koeficijenti trenja za različite sisteme antikorozione zaštite tarnih spojeva, sa akcentom na cink-silikatne premaze i njihove tehničke karakteristike i način primene.",
publisher = "Institut za istraživanja i projektovanja u privredi, Beograd",
journal = "Journal of Applied Engineering Science",
title = "Usage of zinc-silicate coatings in friction connections, Primena cink-silikatnih premaza u tarnim spojevima",
pages = "134-128",
number = "1",
volume = "14",
doi = "10.5937/jaes14-10450"
}

Fric, N., Buđevac, D., Mišković, Z., Marković, Z.,& Dobrić, J.. (2016). Usage of zinc-silicate coatings in friction connections. in Journal of Applied Engineering Science
Institut za istraživanja i projektovanja u privredi, Beograd., 14(1), 128-134.
https://doi.org/10.5937/jaes14-10450

Fric N, Buđevac D, Mišković Z, Marković Z, Dobrić J. Usage of zinc-silicate coatings in friction connections. in Journal of Applied Engineering Science. 2016;14(1):128-134.
doi:10.5937/jaes14-10450 .

Fric, Nenad, Buđevac, Dragan, Mišković, Zoran, Marković, Zlatko, Dobrić, Jelena, "Usage of zinc-silicate coatings in friction connections" in Journal of Applied Engineering Science, 14, no. 1 (2016):128-134,
https://doi.org/10.5937/jaes14-10450 . .

TY  - JOUR
AU  - Fric, Nenad
AU  - Pavlović, Marko
AU  - Buđevac, Dragan
AU  - Mišković, Zoran
AU  - Marković, Zlatko
AU  - Gluhović, Nina
PY  - 2016
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/785
AB  - When applying high strength bolts in friction connections, a load-bearing capacity depends on pretension force in the bolts as well as on friction coefficient found on friction surfaces. It is important to get the reliable value of the pretension force, so friction connections often undergo experimental research. In order to use strain gauges, which are inserted into the bolt shank, bolts need to be calibrated before we even use them in experimental research. Research that has been conducted shows a great difference between nominal and experimental strain in bolts, therefore FEA calibration of the bolts had to be carried out. Good results matching were obtained, hence a use of strain gauges was justified even for bolts without a shank.
AB  - U slučaju smičućih spojeva s visokovrednim zavrtnjevima s punom silom prednaprezanja, nosivost spoja zavisi kako od intenziteta sile prednaprezanja u visokovrednom zavrtnju, tako i od koeficijenta trenja na tarnim površinama. Veoma je važno odrediti pouzdanu vrednost sile prednaprezanja u visokovrednim zavrtnjevima, pa su tarni spojevi često predmet eksperimentalnih istraživanja. Kako bi se za određivanje intenziteta sile prednaprezanja mogle koristiti merne trake ugrađene u telo zavrtnja, zavrtnjeve je neophodno kalibrisati pre početka njihove primene u eksperimentalnom istraživanju. Sprovedeno istraživanje pokazalo je veliku razliku između nominalnih i eksperimentalno određenih dilatacija zavrtnjeva, zbog čega je sprovedena kalibracija zavrtnjeva numeričkom analizom (primenom metode konačnih elemenata). Dobijeno je dobro poklapanje rezultata, a primena mernih traka kod zavrtnjeva koji imaju navoj celom dužinom tela takođe se pokazala kao opravdana.
PB  - Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije, Beograd
T2  - Građevinski materijali i konstrukcije
T1  - Calibration of the bolt pretension by strain gauges vs. FEA
T1  - Eksperimentalna i numerička kalibracija sile prednaprezanja u visokovrednim zavrtnjevima
EP  - 15
IS  - 4
SP  - 3
VL  - 59
DO  - 10.5937/grmk1604003F
ER  - 

@article{
author = "Fric, Nenad and Pavlović, Marko and Buđevac, Dragan and Mišković, Zoran and Marković, Zlatko and Gluhović, Nina",
year = "2016",
abstract = "When applying high strength bolts in friction connections, a load-bearing capacity depends on pretension force in the bolts as well as on friction coefficient found on friction surfaces. It is important to get the reliable value of the pretension force, so friction connections often undergo experimental research. In order to use strain gauges, which are inserted into the bolt shank, bolts need to be calibrated before we even use them in experimental research. Research that has been conducted shows a great difference between nominal and experimental strain in bolts, therefore FEA calibration of the bolts had to be carried out. Good results matching were obtained, hence a use of strain gauges was justified even for bolts without a shank., U slučaju smičućih spojeva s visokovrednim zavrtnjevima s punom silom prednaprezanja, nosivost spoja zavisi kako od intenziteta sile prednaprezanja u visokovrednom zavrtnju, tako i od koeficijenta trenja na tarnim površinama. Veoma je važno odrediti pouzdanu vrednost sile prednaprezanja u visokovrednim zavrtnjevima, pa su tarni spojevi često predmet eksperimentalnih istraživanja. Kako bi se za određivanje intenziteta sile prednaprezanja mogle koristiti merne trake ugrađene u telo zavrtnja, zavrtnjeve je neophodno kalibrisati pre početka njihove primene u eksperimentalnom istraživanju. Sprovedeno istraživanje pokazalo je veliku razliku između nominalnih i eksperimentalno određenih dilatacija zavrtnjeva, zbog čega je sprovedena kalibracija zavrtnjeva numeričkom analizom (primenom metode konačnih elemenata). Dobijeno je dobro poklapanje rezultata, a primena mernih traka kod zavrtnjeva koji imaju navoj celom dužinom tela takođe se pokazala kao opravdana.",
publisher = "Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije, Beograd",
journal = "Građevinski materijali i konstrukcije",
title = "Calibration of the bolt pretension by strain gauges vs. FEA, Eksperimentalna i numerička kalibracija sile prednaprezanja u visokovrednim zavrtnjevima",
pages = "15-3",
number = "4",
volume = "59",
doi = "10.5937/grmk1604003F"
}

Fric, N., Pavlović, M., Buđevac, D., Mišković, Z., Marković, Z.,& Gluhović, N.. (2016). Calibration of the bolt pretension by strain gauges vs. FEA. in Građevinski materijali i konstrukcije
Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije, Beograd., 59(4), 3-15.
https://doi.org/10.5937/grmk1604003F

Fric N, Pavlović M, Buđevac D, Mišković Z, Marković Z, Gluhović N. Calibration of the bolt pretension by strain gauges vs. FEA. in Građevinski materijali i konstrukcije. 2016;59(4):3-15.
doi:10.5937/grmk1604003F .

Fric, Nenad, Pavlović, Marko, Buđevac, Dragan, Mišković, Zoran, Marković, Zlatko, Gluhović, Nina, "Calibration of the bolt pretension by strain gauges vs. FEA" in Građevinski materijali i konstrukcije, 59, no. 4 (2016):3-15,
https://doi.org/10.5937/grmk1604003F . .

TY  - CONF
AU  - Fric, Nenad
AU  - Buđevac, Dragan
AU  - Mišković, Zoran
PY  - 2016
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1399
AB  - Elastična fleksibilnost, odnosno krutost spojeva sa visokovrednim zavrtnjevima u direktnoj je vezi sa fenomenima koji zavise od promene debljine steznog paketa zavrtnja, pre svega sa gubicima sile prednaprezanja u visokovrednim zavrtnjevima. Postojeći izrazi za fleksibilnost spojeva sa visokovrednim zavrtnjevima jedini su način da se eksperimentalni i numerički rezultati potvrde i analitički. U ovom radu prikazani su izrazi za fleksibilnost spojeva sa visokovrednim zavrtnjevima, pregled istraživanja koja su zasnovana na ovim izrazima kao i numerički primer za spojeve sa visokovrednim zavrtnjevima izrađenim prema EN 14399-4.
PB  - Univerzitet u Novom Sadu, Građevinski fakultet Subotica, Subotica
C3  - Zbornik radova 4. međunarodne konferenije Savremena dostignuća u građevinarstvu 2016
T1  - Elastic resilience of high strength bolt connections
T1  - Elastična fleksibilnost spojeva sa visokovrednim zavrtnjevima
EP  - 131
SP  - 123
VL  - 32
DO  - 10.14415/konferencijaGFS2016
ER  - 

@conference{
author = "Fric, Nenad and Buđevac, Dragan and Mišković, Zoran",
year = "2016",
abstract = "Elastična fleksibilnost, odnosno krutost spojeva sa visokovrednim zavrtnjevima u direktnoj je vezi sa fenomenima koji zavise od promene debljine steznog paketa zavrtnja, pre svega sa gubicima sile prednaprezanja u visokovrednim zavrtnjevima. Postojeći izrazi za fleksibilnost spojeva sa visokovrednim zavrtnjevima jedini su način da se eksperimentalni i numerički rezultati potvrde i analitički. U ovom radu prikazani su izrazi za fleksibilnost spojeva sa visokovrednim zavrtnjevima, pregled istraživanja koja su zasnovana na ovim izrazima kao i numerički primer za spojeve sa visokovrednim zavrtnjevima izrađenim prema EN 14399-4.",
publisher = "Univerzitet u Novom Sadu, Građevinski fakultet Subotica, Subotica",
journal = "Zbornik radova 4. međunarodne konferenije Savremena dostignuća u građevinarstvu 2016",
title = "Elastic resilience of high strength bolt connections, Elastična fleksibilnost spojeva sa visokovrednim zavrtnjevima",
pages = "131-123",
volume = "32",
doi = "10.14415/konferencijaGFS2016"
}

Fric, N., Buđevac, D.,& Mišković, Z.. (2016). Elastic resilience of high strength bolt connections. in Zbornik radova 4. međunarodne konferenije Savremena dostignuća u građevinarstvu 2016
Univerzitet u Novom Sadu, Građevinski fakultet Subotica, Subotica., 32, 123-131.
https://doi.org/10.14415/konferencijaGFS2016

Fric N, Buđevac D, Mišković Z. Elastic resilience of high strength bolt connections. in Zbornik radova 4. međunarodne konferenije Savremena dostignuća u građevinarstvu 2016. 2016;32:123-131.
doi:10.14415/konferencijaGFS2016 .

Fric, Nenad, Buđevac, Dragan, Mišković, Zoran, "Elastic resilience of high strength bolt connections" in Zbornik radova 4. međunarodne konferenije Savremena dostignuća u građevinarstvu 2016, 32 (2016):123-131,
https://doi.org/10.14415/konferencijaGFS2016 . .

TY  - JOUR
AU  - Fric, Nenad
AU  - Buđevac, Dragan
AU  - Mišković, Zoran
AU  - Marković, Zlatko
AU  - Spremić, Milan
PY  - 2016
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1060
AB  - Firma “Alcoa Fastening Systems” konstruisala je “Huck BobTail” sistem mehaničkih spojnih sredstava i predstavila ga kao jednu od najnaprednijih tehnologija spajanja do danas. U pitanju su zavrtnjevi sa zaključavanjem (antivandal) naredne generacije koji donose i do pet puta veću čvrstoću na zamor od standardnih zavrtnjeva sa navrtkom, a konstruisani su tako da pruže visoku čvrstoću, pouzdanost i otpornost na vibracije i u najekstremnijim uslovima. “Huck BobTail” spojna sredstva odlikuju visoke performance kao i jednostavna i brza ugradnja. U ovom radu prikazan je istorijski razvoj spojnih sredstava sa zaključavanjem. Detaljno je opisano spojno sredstvo sistema “Huck BobTail”, oprema i način njihove ugradnje u spojeve kao i način unošenja sile prednaprezanja. Prikazan je izvod iz postojećih predstandarda za proračun nosivosti spojnih sredstava sa zaključavanjem, sa posebnim akcentom na minimalna rastojanja između zavrtnjeva u spoju, nosivost spojnog sredstva na smicanje, pritisak po omotaču rupe i zatezanje.
T2  - Građevinski kalendar
T1  - Visokovredni zavrtnjevi sa zaključavanjem "Huck BobTail"
EP  - 64
SP  - 36
VL  - 48
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1060
ER  - 

@article{
author = "Fric, Nenad and Buđevac, Dragan and Mišković, Zoran and Marković, Zlatko and Spremić, Milan",
year = "2016",
abstract = "Firma “Alcoa Fastening Systems” konstruisala je “Huck BobTail” sistem mehaničkih spojnih sredstava i predstavila ga kao jednu od najnaprednijih tehnologija spajanja do danas. U pitanju su zavrtnjevi sa zaključavanjem (antivandal) naredne generacije koji donose i do pet puta veću čvrstoću na zamor od standardnih zavrtnjeva sa navrtkom, a konstruisani su tako da pruže visoku čvrstoću, pouzdanost i otpornost na vibracije i u najekstremnijim uslovima. “Huck BobTail” spojna sredstva odlikuju visoke performance kao i jednostavna i brza ugradnja. U ovom radu prikazan je istorijski razvoj spojnih sredstava sa zaključavanjem. Detaljno je opisano spojno sredstvo sistema “Huck BobTail”, oprema i način njihove ugradnje u spojeve kao i način unošenja sile prednaprezanja. Prikazan je izvod iz postojećih predstandarda za proračun nosivosti spojnih sredstava sa zaključavanjem, sa posebnim akcentom na minimalna rastojanja između zavrtnjeva u spoju, nosivost spojnog sredstva na smicanje, pritisak po omotaču rupe i zatezanje.",
journal = "Građevinski kalendar",
title = "Visokovredni zavrtnjevi sa zaključavanjem "Huck BobTail"",
pages = "64-36",
volume = "48",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1060"
}

Fric, N., Buđevac, D., Mišković, Z., Marković, Z.,& Spremić, M.. (2016). Visokovredni zavrtnjevi sa zaključavanjem "Huck BobTail". in Građevinski kalendar, 48, 36-64.
https://hdl.handle.net/21.15107/rcub_grafar_1060

Fric N, Buđevac D, Mišković Z, Marković Z, Spremić M. Visokovredni zavrtnjevi sa zaključavanjem "Huck BobTail". in Građevinski kalendar. 2016;48:36-64.
https://hdl.handle.net/21.15107/rcub_grafar_1060 .

Fric, Nenad, Buđevac, Dragan, Mišković, Zoran, Marković, Zlatko, Spremić, Milan, "Visokovredni zavrtnjevi sa zaključavanjem "Huck BobTail"" in Građevinski kalendar, 48 (2016):36-64,
https://hdl.handle.net/21.15107/rcub_grafar_1060 .

TY  - CONF
AU  - Gluhović, Nina
AU  - Spremić, Milan
AU  - Marković, Zlatko
AU  - Buđevac, Dragan
AU  - Fric, Nenad
PY  - 2016
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1392
AB  - Najnoviji trendovi u građevinarstvu u pogledu projektovanja vitkih konstrukcija sa velikim rasponima, velikim otvorenim unutrašnjim prostorima, nekonvencionalnim oblicima i konstrukcijskim rešenjima, često dovode do izraženih problema u pogledu graničnih stanja upotrebljivosti. Izražene vibracije međuspratnih konstrukcija izazvane ljudskim aktivnostima mogu značajno da utiču na funkcionalnost objekta, komfor ljudi i kvalitet života unutar objekta. U ovom radu dat je kratak prikaz proračuna spregnutih nosača na dejstvo vibracija, kao i preporuke za proračun vibracija izazvanih ljudskim aktivnostima.
PB  - Društvo građevinskih konstruktera Srbije, Beograd
C3  - Zbornik radova / Društvо građevinskih konstruktera Srbije, Simpozijum 2016, 15-17. septembar, Zlatibor
T1  - Proračun spregnutih međuspratnih nosača na dejstvo vibracija izazvanih aktivnostima ljudi
EP  - 458
SP  - 449
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1392
ER  - 

@conference{
author = "Gluhović, Nina and Spremić, Milan and Marković, Zlatko and Buđevac, Dragan and Fric, Nenad",
year = "2016",
abstract = "Najnoviji trendovi u građevinarstvu u pogledu projektovanja vitkih konstrukcija sa velikim rasponima, velikim otvorenim unutrašnjim prostorima, nekonvencionalnim oblicima i konstrukcijskim rešenjima, često dovode do izraženih problema u pogledu graničnih stanja upotrebljivosti. Izražene vibracije međuspratnih konstrukcija izazvane ljudskim aktivnostima mogu značajno da utiču na funkcionalnost objekta, komfor ljudi i kvalitet života unutar objekta. U ovom radu dat je kratak prikaz proračuna spregnutih nosača na dejstvo vibracija, kao i preporuke za proračun vibracija izazvanih ljudskim aktivnostima.",
publisher = "Društvo građevinskih konstruktera Srbije, Beograd",
journal = "Zbornik radova / Društvо građevinskih konstruktera Srbije, Simpozijum 2016, 15-17. septembar, Zlatibor",
title = "Proračun spregnutih međuspratnih nosača na dejstvo vibracija izazvanih aktivnostima ljudi",
pages = "458-449",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1392"
}

Gluhović, N., Spremić, M., Marković, Z., Buđevac, D.,& Fric, N.. (2016). Proračun spregnutih međuspratnih nosača na dejstvo vibracija izazvanih aktivnostima ljudi. in Zbornik radova / Društvо građevinskih konstruktera Srbije, Simpozijum 2016, 15-17. septembar, Zlatibor
Društvo građevinskih konstruktera Srbije, Beograd., 449-458.
https://hdl.handle.net/21.15107/rcub_grafar_1392

Gluhović N, Spremić M, Marković Z, Buđevac D, Fric N. Proračun spregnutih međuspratnih nosača na dejstvo vibracija izazvanih aktivnostima ljudi. in Zbornik radova / Društvо građevinskih konstruktera Srbije, Simpozijum 2016, 15-17. septembar, Zlatibor. 2016;:449-458.
https://hdl.handle.net/21.15107/rcub_grafar_1392 .

Gluhović, Nina, Spremić, Milan, Marković, Zlatko, Buđevac, Dragan, Fric, Nenad, "Proračun spregnutih međuspratnih nosača na dejstvo vibracija izazvanih aktivnostima ljudi" in Zbornik radova / Društvо građevinskih konstruktera Srbije, Simpozijum 2016, 15-17. septembar, Zlatibor (2016):449-458,
https://hdl.handle.net/21.15107/rcub_grafar_1392 .

TY  - JOUR
AU  - Gluhović, Nina
AU  - Spremić, Milan
AU  - Marković, Zlatko
AU  - Buđevac, Dragan
AU  - Fric, Nenad
PY  - 2016
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/784
AB  - The latest demands in construction design towards slender structures with large spans, large open interiors, unconventional shapes and constructional solutions are leading to the extensive problems related to the serviceability limit state. Slender structures with large spans have lower natural frequencies and lower natural damping, considerably influencing the dynamic response of the structure. Annoying vibrations induced by human activities can significantly affect the structure's functionality, comfort of people and quality of life. Design recommendations for composite steel-concrete floor vibrations can be found in different standards. This paper presents a short overview of design procedures for vibrations of composite steel-concrete beams and design recommendations of floor vibrations induced by human activities, through two design criteria.
AB  - Najnovije tendencije u građevinarstvu u pogledu projektovanja vitkih konstrukcija s velikim rasponima, velikim otvorenim unutrašnjim prostorima, nekonvencionalnim oblicima i konstrukcijskim rešenjima, često uzrokuju izražene probleme u pogledu graničnih stanja upotrebljivosti. Vitke konstrukcije velikih raspona - s niskim sopstvenim frekvencijama oscilovanja i sopstvenim koeficijentom prigušenja - značajno utiču na dinamički odgovor konstrukcije. Izražene vibracije međuspratnih konstrukcija, izazvane ljudskim aktivnostima, mogu veoma da utiču na funkcionalnost objekta, komfor ljudi i kvalitet života unutar objekta. Preporuke za projektovanje spregnutih konstrukcija, s ciljem zadovoljenja kriterijuma vibracija, mogu se naći u različitim standardima. U ovom radu dat je kratak prikaz proračuna spregnutih nosača na dejstvo vibracija, kao i preporuke za proračun vibracija izazvanih ljudskim aktivnostima, putem prikaza dva proračunska kriterijuma.
PB  - Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije, Beograd
T2  - Građevinski materijali i konstrukcije
T1  - Vibrations of composite steel-concrete floors induced by human activities
T1  - Vibracije spregnutih nosača međuspratnih konstrukcija od čelika i betona, izazvanih aktivnostima ljudi
EP  - 29
IS  - 4
SP  - 17
VL  - 59
DO  - 10.5937/grmk1604017G
ER  - 

@article{
author = "Gluhović, Nina and Spremić, Milan and Marković, Zlatko and Buđevac, Dragan and Fric, Nenad",
year = "2016",
abstract = "The latest demands in construction design towards slender structures with large spans, large open interiors, unconventional shapes and constructional solutions are leading to the extensive problems related to the serviceability limit state. Slender structures with large spans have lower natural frequencies and lower natural damping, considerably influencing the dynamic response of the structure. Annoying vibrations induced by human activities can significantly affect the structure's functionality, comfort of people and quality of life. Design recommendations for composite steel-concrete floor vibrations can be found in different standards. This paper presents a short overview of design procedures for vibrations of composite steel-concrete beams and design recommendations of floor vibrations induced by human activities, through two design criteria., Najnovije tendencije u građevinarstvu u pogledu projektovanja vitkih konstrukcija s velikim rasponima, velikim otvorenim unutrašnjim prostorima, nekonvencionalnim oblicima i konstrukcijskim rešenjima, često uzrokuju izražene probleme u pogledu graničnih stanja upotrebljivosti. Vitke konstrukcije velikih raspona - s niskim sopstvenim frekvencijama oscilovanja i sopstvenim koeficijentom prigušenja - značajno utiču na dinamički odgovor konstrukcije. Izražene vibracije međuspratnih konstrukcija, izazvane ljudskim aktivnostima, mogu veoma da utiču na funkcionalnost objekta, komfor ljudi i kvalitet života unutar objekta. Preporuke za projektovanje spregnutih konstrukcija, s ciljem zadovoljenja kriterijuma vibracija, mogu se naći u različitim standardima. U ovom radu dat je kratak prikaz proračuna spregnutih nosača na dejstvo vibracija, kao i preporuke za proračun vibracija izazvanih ljudskim aktivnostima, putem prikaza dva proračunska kriterijuma.",
publisher = "Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije, Beograd",
journal = "Građevinski materijali i konstrukcije",
title = "Vibrations of composite steel-concrete floors induced by human activities, Vibracije spregnutih nosača međuspratnih konstrukcija od čelika i betona, izazvanih aktivnostima ljudi",
pages = "29-17",
number = "4",
volume = "59",
doi = "10.5937/grmk1604017G"
}

Gluhović, N., Spremić, M., Marković, Z., Buđevac, D.,& Fric, N.. (2016). Vibrations of composite steel-concrete floors induced by human activities. in Građevinski materijali i konstrukcije
Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije, Beograd., 59(4), 17-29.
https://doi.org/10.5937/grmk1604017G

Gluhović N, Spremić M, Marković Z, Buđevac D, Fric N. Vibrations of composite steel-concrete floors induced by human activities. in Građevinski materijali i konstrukcije. 2016;59(4):17-29.
doi:10.5937/grmk1604017G .

Gluhović, Nina, Spremić, Milan, Marković, Zlatko, Buđevac, Dragan, Fric, Nenad, "Vibrations of composite steel-concrete floors induced by human activities" in Građevinski materijali i konstrukcije, 59, no. 4 (2016):17-29,
https://doi.org/10.5937/grmk1604017G . .

TY  - CONF
AU  - Dobrić, Jelena 
AU  - Marković, Zlatko A.
AU  - Buđevac, Dragan V.
AU  - Spremić, Milan B.
AU  - Fric, Nenad
PY  - 2015
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1963
AB  - Continuous strength method is a contemporary approach to calculation of resistance of stainless steel cross-sections which has been recently developed at the Imperial College of London. The basis of the method is the continuous relation between the slenderness and strain capacity of a
cross-section, nonlinear relation between the stress and strain and the strengthening effects of cold forming. In the paper are presented the fundamental rules for calculation of cross-section resistance
according to continuous strength method; the comparative analysis of design resistance of the compressed cross-section was conducted through a numerical example according to this method and EN 1993-1-4.
C3  - iNDiS 2015 Planiranje, projektovanje, građenje i obnova graditeljstva 13. međunarodna naučna konferencija
T1  - Stainless steel cross-section resistance according to continuous strength method
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1963
ER  - 

@conference{
author = "Dobrić, Jelena  and Marković, Zlatko A. and Buđevac, Dragan V. and Spremić, Milan B. and Fric, Nenad",
year = "2015",
abstract = "Continuous strength method is a contemporary approach to calculation of resistance of stainless steel cross-sections which has been recently developed at the Imperial College of London. The basis of the method is the continuous relation between the slenderness and strain capacity of a
cross-section, nonlinear relation between the stress and strain and the strengthening effects of cold forming. In the paper are presented the fundamental rules for calculation of cross-section resistance
according to continuous strength method; the comparative analysis of design resistance of the compressed cross-section was conducted through a numerical example according to this method and EN 1993-1-4.",
journal = "iNDiS 2015 Planiranje, projektovanje, građenje i obnova graditeljstva 13. međunarodna naučna konferencija",
title = "Stainless steel cross-section resistance according to continuous strength method",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1963"
}

Dobrić, J., Marković, Z. A., Buđevac, D. V., Spremić, M. B.,& Fric, N.. (2015). Stainless steel cross-section resistance according to continuous strength method. in iNDiS 2015 Planiranje, projektovanje, građenje i obnova graditeljstva 13. međunarodna naučna konferencija.
https://hdl.handle.net/21.15107/rcub_grafar_1963

Dobrić J, Marković ZA, Buđevac DV, Spremić MB, Fric N. Stainless steel cross-section resistance according to continuous strength method. in iNDiS 2015 Planiranje, projektovanje, građenje i obnova graditeljstva 13. međunarodna naučna konferencija. 2015;.
https://hdl.handle.net/21.15107/rcub_grafar_1963 .

Dobrić, Jelena , Marković, Zlatko A., Buđevac, Dragan V., Spremić, Milan B., Fric, Nenad, "Stainless steel cross-section resistance according to continuous strength method" in iNDiS 2015 Planiranje, projektovanje, građenje i obnova graditeljstva 13. međunarodna naučna konferencija (2015),
https://hdl.handle.net/21.15107/rcub_grafar_1963 .

TY  - CONF
AU  - Dobrić, Jelena
AU  - Marković, Zlatko A.
AU  - Buđevac, Dragan V.
AU  - Fric, Nenad
PY  - 2015
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1962
AB  - Stainless steel is characterized by a number of features that determine significantly different behaviour of structural members made of this material, compared to equivalent carbon steel members. These characteristics, mostly expressed at compressed members, are reflected in nonlinear stress-
strain behaviour, significant strength enhancements due to cold-working and different thermal characteristic of material. European stainless steel standard EN 1993-1-4 does not give any explicit rules for calculation of resistance of built-up compression members with chords in contact. This paper presents part of the experimental results of flexural buckling ultimate resistance cold-formed built-up members to the around intangible axis. The basic material used in the research is stainless steel with austenitic microstructure 1.4301. Members are made of two C profiles, directly and discontinuously connected in direction of longitudinal axis. The experimental values of ultimate
resistances to flexural buckling around intangible axis are compared with values of ultimate resistances obtained by recommendations of EN 1993-1-4 and EN 1993-1-1
C3  - Eighth International Conference on ADVANCES IN STEEL STRUCTURES, Lisbon, Portugal, July 22-24
T1  - Experimental investigation of flexural buckling of cold formed built-up stainless steel members
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1962
ER  - 

@conference{
author = "Dobrić, Jelena and Marković, Zlatko A. and Buđevac, Dragan V. and Fric, Nenad",
year = "2015",
abstract = "Stainless steel is characterized by a number of features that determine significantly different behaviour of structural members made of this material, compared to equivalent carbon steel members. These characteristics, mostly expressed at compressed members, are reflected in nonlinear stress-
strain behaviour, significant strength enhancements due to cold-working and different thermal characteristic of material. European stainless steel standard EN 1993-1-4 does not give any explicit rules for calculation of resistance of built-up compression members with chords in contact. This paper presents part of the experimental results of flexural buckling ultimate resistance cold-formed built-up members to the around intangible axis. The basic material used in the research is stainless steel with austenitic microstructure 1.4301. Members are made of two C profiles, directly and discontinuously connected in direction of longitudinal axis. The experimental values of ultimate
resistances to flexural buckling around intangible axis are compared with values of ultimate resistances obtained by recommendations of EN 1993-1-4 and EN 1993-1-1",
journal = "Eighth International Conference on ADVANCES IN STEEL STRUCTURES, Lisbon, Portugal, July 22-24",
title = "Experimental investigation of flexural buckling of cold formed built-up stainless steel members",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1962"
}

Dobrić, J., Marković, Z. A., Buđevac, D. V.,& Fric, N.. (2015). Experimental investigation of flexural buckling of cold formed built-up stainless steel members. in Eighth International Conference on ADVANCES IN STEEL STRUCTURES, Lisbon, Portugal, July 22-24.
https://hdl.handle.net/21.15107/rcub_grafar_1962

Dobrić J, Marković ZA, Buđevac DV, Fric N. Experimental investigation of flexural buckling of cold formed built-up stainless steel members. in Eighth International Conference on ADVANCES IN STEEL STRUCTURES, Lisbon, Portugal, July 22-24. 2015;.
https://hdl.handle.net/21.15107/rcub_grafar_1962 .

Dobrić, Jelena, Marković, Zlatko A., Buđevac, Dragan V., Fric, Nenad, "Experimental investigation of flexural buckling of cold formed built-up stainless steel members" in Eighth International Conference on ADVANCES IN STEEL STRUCTURES, Lisbon, Portugal, July 22-24 (2015),
https://hdl.handle.net/21.15107/rcub_grafar_1962 .

TY  - CONF
AU  - Fric, Nenad
AU  - Buđevac, Dragan V.
AU  - Mišković, Zoran
AU  - Veljković, Milan B.
AU  - Marković, Zlatko A.
AU  - Dobrić, Jelena
PY  - 2015
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1952
AB  - When analysing slip resistance connections, which are commonly used in-situ assemblied joints of structures dominantly loaded by cyclic loading, for example in bridges, telecommunication towers, towers for wind turbines, we may say that preloaded high strength bolts are their most important part. A level of pretension force in a bolt influences the strength of a slip resistance connection, therefore it is very important to attain a design level of a pretension force. This paper tackles most frequently used methods for measuring of a pretension force in high strength bolts both on site and in a laboratory. Primarily usage of ultrasonic methods, washer like load cells (with strain gauges and piezoelectric), strain gauges installed on the bolt shank and strain gauges installed inside of the bolt shank. The emphasis is both on a use of strain gauges which measure pretension force inhigh strength bolts and on a bolt calibration procedure prior to pretensioning. Installation process of strain gauges in the bolt shank is described in detail and all its specificities are bring to the attention based experimental research conducted on 126 bolts.
C3  - International Conference on ADVANCES IN STEEL STRUCTURES, Lisbon, Portugal, July 22-24, 2015.
T1  - Calibration of the high strenght bolts for measuring of the pretension force
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1952
ER  - 

@conference{
author = "Fric, Nenad and Buđevac, Dragan V. and Mišković, Zoran and Veljković, Milan B. and Marković, Zlatko A. and Dobrić, Jelena",
year = "2015",
abstract = "When analysing slip resistance connections, which are commonly used in-situ assemblied joints of structures dominantly loaded by cyclic loading, for example in bridges, telecommunication towers, towers for wind turbines, we may say that preloaded high strength bolts are their most important part. A level of pretension force in a bolt influences the strength of a slip resistance connection, therefore it is very important to attain a design level of a pretension force. This paper tackles most frequently used methods for measuring of a pretension force in high strength bolts both on site and in a laboratory. Primarily usage of ultrasonic methods, washer like load cells (with strain gauges and piezoelectric), strain gauges installed on the bolt shank and strain gauges installed inside of the bolt shank. The emphasis is both on a use of strain gauges which measure pretension force inhigh strength bolts and on a bolt calibration procedure prior to pretensioning. Installation process of strain gauges in the bolt shank is described in detail and all its specificities are bring to the attention based experimental research conducted on 126 bolts.",
journal = "International Conference on ADVANCES IN STEEL STRUCTURES, Lisbon, Portugal, July 22-24, 2015.",
title = "Calibration of the high strenght bolts for measuring of the pretension force",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1952"
}

Fric, N., Buđevac, D. V., Mišković, Z., Veljković, M. B., Marković, Z. A.,& Dobrić, J.. (2015). Calibration of the high strenght bolts for measuring of the pretension force. in International Conference on ADVANCES IN STEEL STRUCTURES, Lisbon, Portugal, July 22-24, 2015..
https://hdl.handle.net/21.15107/rcub_grafar_1952

Fric N, Buđevac DV, Mišković Z, Veljković MB, Marković ZA, Dobrić J. Calibration of the high strenght bolts for measuring of the pretension force. in International Conference on ADVANCES IN STEEL STRUCTURES, Lisbon, Portugal, July 22-24, 2015.. 2015;.
https://hdl.handle.net/21.15107/rcub_grafar_1952 .

Fric, Nenad, Buđevac, Dragan V., Mišković, Zoran, Veljković, Milan B., Marković, Zlatko A., Dobrić, Jelena, "Calibration of the high strenght bolts for measuring of the pretension force" in International Conference on ADVANCES IN STEEL STRUCTURES, Lisbon, Portugal, July 22-24, 2015. (2015),
https://hdl.handle.net/21.15107/rcub_grafar_1952 .

TY  - CONF
AU  - Dobrić, Jelena
AU  - Marković, Zlatko
AU  - Buđevac, Dragan
AU  - Spremić, Milan
AU  - Fric, Nenad
PY  - 2015
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1340
PB  - Fakultet tehničkih nauka, Departman za građevinarstvo i geodeziju, Novi Sad
C3  - Planiranje, projektovanje, građenje i obnova graditeljstva : zbornik radova / 13. međunarodna naučna konferencija iNDiS 2015, Novi Sad, Srbija 25-27. novembar 2015
T1  - Stainless steel cross-section resistance according to continuous strength method
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1340
ER  - 

@conference{
author = "Dobrić, Jelena and Marković, Zlatko and Buđevac, Dragan and Spremić, Milan and Fric, Nenad",
year = "2015",
publisher = "Fakultet tehničkih nauka, Departman za građevinarstvo i geodeziju, Novi Sad",
journal = "Planiranje, projektovanje, građenje i obnova graditeljstva : zbornik radova / 13. međunarodna naučna konferencija iNDiS 2015, Novi Sad, Srbija 25-27. novembar 2015",
title = "Stainless steel cross-section resistance according to continuous strength method",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1340"
}

Dobrić, J., Marković, Z., Buđevac, D., Spremić, M.,& Fric, N.. (2015). Stainless steel cross-section resistance according to continuous strength method. in Planiranje, projektovanje, građenje i obnova graditeljstva : zbornik radova / 13. međunarodna naučna konferencija iNDiS 2015, Novi Sad, Srbija 25-27. novembar 2015
Fakultet tehničkih nauka, Departman za građevinarstvo i geodeziju, Novi Sad..
https://hdl.handle.net/21.15107/rcub_grafar_1340

Dobrić J, Marković Z, Buđevac D, Spremić M, Fric N. Stainless steel cross-section resistance according to continuous strength method. in Planiranje, projektovanje, građenje i obnova graditeljstva : zbornik radova / 13. međunarodna naučna konferencija iNDiS 2015, Novi Sad, Srbija 25-27. novembar 2015. 2015;.
https://hdl.handle.net/21.15107/rcub_grafar_1340 .

Dobrić, Jelena, Marković, Zlatko, Buđevac, Dragan, Spremić, Milan, Fric, Nenad, "Stainless steel cross-section resistance according to continuous strength method" in Planiranje, projektovanje, građenje i obnova graditeljstva : zbornik radova / 13. međunarodna naučna konferencija iNDiS 2015, Novi Sad, Srbija 25-27. novembar 2015 (2015),
https://hdl.handle.net/21.15107/rcub_grafar_1340 .

TY  - THES
AU  - Fric, Nenad
PY  - 2015
UR  - http://eteze.bg.ac.rs/application/showtheses?thesesId=2381
UR  - https://fedorabg.bg.ac.rs/fedora/get/o:10356/bdef:Content/download
UR  - http://vbs.rs/scripts/cobiss?command=DISPLAY&base=70036&RID=513688722
UR  - http://nardus.mpn.gov.rs/123456789/4185
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1663
AB  - Tarni spojevi sa prednapregnutim zavrtnjevima imaju veliki značaj u oblastičeličnih konstrukcija, posebno u slučajevima konstrukcija izloženenih dejstvudinamičkog opterećenja, kao što su mostovi, kranski nosači, stubovi vetro generatora,itd. Dva parametra koji imaju najveći uticaj na nosivost ovakvih spojeva su koeficijenttrenja na tarnim površima i ostvarena sila prednaprezanja u visokovrednimzavrtnjevima.Potreba da se prate savremeni trendovi u građevinarstvu, posebno sa aspektanovih materijala, rezultovala je ispitivanjem spojeva, u okviru ovog istraživanja, koji suantikoroziono zaštićeni savremenim cink-silikatnim premazima. Korišćen jekomercijalni premaz „Resist 86“, proizvođača „Jotun“ iz Norveške. Veze su ostvareneuz pomoć klasičnih HV visokovrednih zavrtnjeva, ali i uz pomoć, u građevinarstvu svečešće primenjivanih, zavrtnjeva sa zaključavanjem tipa „Huck BobTail (HBT)“,proizvođača „Alcoa Fastening Systems“ iz Engleske. Na ovaj način, klasičan postupakzaštite tarnih površina metalizacijom zamenjuje se jeftinijim, jednostavnijim i bržimpostupkom nanošenja premaza. Takođe, ispitivana je i opravdanost primene zavrtnjevasa zaključavanjem u poređenju sa klasičnim pregnapregnutim zavrtnjevima. Međutim,primena novog materijala kao antikoroziоne zaštite tarnih površina otvara pitanjegubitaka sile prednaprezanja u zavrtnjevima jer je opšte poznato da dominantan deoovih gubitaka potiče od promene debljine sloja antikorozione zaštite kroz vreme.Sprovedeno istraživanje ima dva osnovna cilja: da proveri opravdanost primenepredmetnog premaza u tarnim spojevima, sa stanovišta ostvarenog koeficijenta trenja isa stanovišta gubitaka sile prednaprezanja.Sprovedena su sopstvena eksperimentalna istraživanja i ispitano je 126 zavrtnjevau okviru 42 uzorka spojeva sa dvostrukim preklopom. Eksperimentalno istraživanje jezbog svog obima i raznolikosti podeljeno u nekoliko faza:- Određivanje fizičko-mehaničkih svojstava primenjenih materijala. Ova fazapodrazumeva određivanje koeficijenta trenja koji se ostvaruje primenompredmetnog cink silikatnog premaza kao i fizičko mehaničkih svojstava (granicerazvlačenja i zatezne čvrstoće) materijala od kog su izrađeni primenjeni HV iHBT zavrtnjevi;- Određivanje debljine nanetog premaza na svaku od čeličnih ploča od kojih suformirani uzorci;- Kalibracija sile u zavrtnjeva. Kao najracionalniji ali i najefikasniji način zamerenje sile u zavrtnju izabran je postupak ugradnje mernih traka u telozavrtnjeva. Nakon ugradnje mernih traka, a pre ugradnje zavrtnjeva u uzorke,izvršena je njihova kalibracija i tako uspostavljena veza između promene dužinezavrtnja (merne trake) i sile u zavrtnju. Neki dragoceni zaključci o raspodeli sileunutar zavrnjeva su izvedeni na bazi ovih rezultata.- Centralni deo istraživanja u kojem je izvršeno kontinuirano praćenje promenesile u zavrtnjevima i to 60 nedelja za prvo ugrađenih 36 zavrtnjeva, odnosno 24nedelje za preostalih 72 zavrtnja i- Ispitivanje 6 uzoraka (18 zavrtnjeva) na dejstvo dinamičkog opterećenja tokom2x106 ciklusa.Uzorci su formirani na način da se obezbedi variranje: vrste zavrtnja (HV i HBT),dužine zavrtnja preko različite debljine steznog paketa (18 mm, 35 mm i 55 mm),debljine premaza (uzorci sa i bez premaza) i vrste opterećenja uzorka (bez spoljašnjegopterećenja na uzorke i uzorci izloženi dejstvu dinamičkog opterećenja).Dobijeni rezultati potvrđuju opravdanost primene predmetnog premaza u tarnimspojevima, sa obzirom da su određeni koeficijenti trenja u intervalu 0,40-0,50. Takođe,za svaku grupu zavrtnjeva određeni su inicijalni, kratkoročni i dugoročni gubici sileprednaprezanja. Ekstrapolacijom rezultata sakupljenih u prve 24 nedelje na period od 20godina, za svaki tip i dužinu zavrtnja, definisana je kriva koja opisuje promenu sileprednaprezanja u zavrtnju u posmatranom periodu. Od svih ispitivanih zavrtnjeva jedinokod najkraćih HBT zavrtnjeva (dužine 55 mm) uočen je problem ostvarivanjaproračunske sile prednaprezanja. Kod zavrtnjeva ugrađenih u uzorke sa antikorozionomzaštitom gubici sile prednaprezanja značajno su veći od onih koji su ugrađeni u uzorkebez antikorozione zaštite. Uticaj dinamičkog opterećenja, definisanog tako da ne dovededo proklizavanja veze niti plastifikacije bilo kog njenog dela, može se zanemariti saaspekta gubitaka sile prednaprezanja. Takođe, može se zaključiti da je gubitak sileprednaprezanja najveći kod najkraćih zavrtnjeva i da opada sa povećanjem dužinezavrtnjeva. Primenom metode konačnih elemenata (MKE) modifikovani su postojećiizrazi za fleksibilnost HV zavrtnjeva i definisani novi za HBT zavrtnjeve. Takođe,primenom rezultata MKE i sopstvenog eksperimentalnog istraživanja, određena sureološka svojstva primenjenog cink-silikatnog premaza.Na osnovu rezultata sprovedenog istraživanja zaključuje se da je primenapredmetnih premaza kao i upotreba ispitivanih HBT zavrtnjeva u tarnim spojevimamoguća. Takođe, izvršena kvantifikacija gubitaka sile prednaprezanja omogućavaprojektantima da ih u postupku projektovanja uzmu u obzir i tako spreče gubitaknosivosti usled proklizavanja.
AB  - Friction connections with high-strength pretension bolts are greatly important inthe field of steel structures, especially in structures imposed to dynamic loads, such asbridges, cranes and wind turbine towers. Two parameters mostly influencing the loadbearingcapacity of such connections are the friction coefficient on friction surfaces andthe achieved pretension force in high-strength bolts.In an effort to meet contemporary trends in the field of structural engineering,especially by usage of new materials, connections with state-of-the-art zinc-rich silicatebased coating as an anti-corrosive primer have been investigated in the scope of thisresearch. Such a commercial coating „Resist 86“, manufacturer by „Jotun“ in Norway,is used. Friction connections are formed using classical HV high-strength bolts but alsothe lock-bolts „Huck BobTail (HBT)“, manufactured by „Alcoa Fastening Systems“ inEngland, which are more and more frequently used in the field of structural engineering.In this way a classical procedure of providing metalized friction surfaces is replacedwith much cheaper, more simple and quicker coating process. At the same time lockboltsare analysed in terms of their applicability when compared to the classicalpretension bolts in use. On the other hand, application of the new material, which acts asanti-corrosion protection over friction surfaces, stirs debate with regards to pretensionforce loss in bolts as it is a commonly known fact that the dominant portion of theselosses stems from a change in anti-corrosion layer thickness which may emerge in time.The research in question strives at two principle goals: whether usage the coatingin question in tension connections is justified from the standpoint of achieved frictioncoefficient and from the standpoint of loss of the pretension force.Related experimental research has been conducted in which 126 bolts were testedwithin 42 double-lap joint specimens. The experimental works are divided into severalphases due to their large extent and variety:- Determination of physical and mechanical properties of the applied materials.This phase implies testing of friction coefficient which is achieved by applyingthe aforementioned zinc-based silicate coating, and the mechanical properties(yield strength and tensile strength) of the HV and HBT bolts materials;- Measuring the thickness of the coating applied to all the steel plates used to fromthe specimens;- Bolt force calibration. Bolt force measurement procedure relating to insertion ofstrain gauges into the bolts has been selected as the most rational and efficientone. After the strain gauges are fitted, and prior to assembling the bolts into thespecimens, bolt force is calibrated in means of determination of force-strainrelation for each bolt. Some significant conclusions about distribution of theforce in the bolt have been drawn relaying on these results.- The focal point of the research - continuous monitoring the changes in boltforces has been carried out over 60 weeks for the first batch of 36 bolts, and over24 weeks for the remaining 72 bolts;- Testing of 6 specimens (18 bolts) for dynamic loads in 2x106 cycles.Specimens have been formed in a way to allow variation of: bolt types (HV andHBT), bolt lengths for various clamping package thicknesses (18 mm, 35 mm and 55mm), coating thickness (with and without coating) and loading conditions (with noexternal load sustained by samples and samples exposed to dynamic loads).The obtained results justify the application of the investigated coating type infriction connections given that friction coefficients are in range of 0,40-0,50. Inaddition, initial short-term and long-term pretension force losses have been determinedfor each group of bolts. Results obtained within the first 24 weeks are extrapolated toperiod of 20 years where a curve which describes change in pretension force within timewas defined for each bolt type and bolt length separately. The shortest HBT bolts (55mm long) showed to be problematic with regards to achieving the design value ofpretension force. Pretension force losses are significant in bolts assembled to specimenswith the coating when compared to those without. Influence of the dynamic loads,which are below slip resistance of the connection, can be disregarded in means of lossof the pretension force. Additionally, the conclusion can be drawn that the pretensionforce loss is the largest in the case of shortest bolts and that it can be reduced byincreasing the bolt length. Using finite element method (FEM) for modelling theexperiments of calibration process of HV and HBT bolts, existing equations forflexibility of HV bolts are improved, and for the first time equations are defined forHBT bolts. Also, using the results of FEM and experimental research, rheologicalproperties of the applied zinc-silicate coating are determined.According to results obtained from the conducted research, application ofaforementioned coatings can be recommended, as well as the use of tested HBT bolts infriction connections. Quantification of pretension force loss allows for the engineers inpractice to take such data into consideration in the course of design development andprevention of overestimation of load-bearing capacity against slippage.
PB  - Универзитет у Београду, Грађевински факултет
T2  - Универзитет у Београду
T1  - Teorijsko i eksperimentalno istraživanje gubitaka sile prednaprezanja u visokovrednim zavrtnjevima
T1  - Theoretical and experimental research of losses of pretension force in high strength bolts
UR  - https://hdl.handle.net/21.15107/rcub_nardus_4185
ER  - 

@phdthesis{
author = "Fric, Nenad",
year = "2015",
abstract = "Tarni spojevi sa prednapregnutim zavrtnjevima imaju veliki značaj u oblastičeličnih konstrukcija, posebno u slučajevima konstrukcija izloženenih dejstvudinamičkog opterećenja, kao što su mostovi, kranski nosači, stubovi vetro generatora,itd. Dva parametra koji imaju najveći uticaj na nosivost ovakvih spojeva su koeficijenttrenja na tarnim površima i ostvarena sila prednaprezanja u visokovrednimzavrtnjevima.Potreba da se prate savremeni trendovi u građevinarstvu, posebno sa aspektanovih materijala, rezultovala je ispitivanjem spojeva, u okviru ovog istraživanja, koji suantikoroziono zaštićeni savremenim cink-silikatnim premazima. Korišćen jekomercijalni premaz „Resist 86“, proizvođača „Jotun“ iz Norveške. Veze su ostvareneuz pomoć klasičnih HV visokovrednih zavrtnjeva, ali i uz pomoć, u građevinarstvu svečešće primenjivanih, zavrtnjeva sa zaključavanjem tipa „Huck BobTail (HBT)“,proizvođača „Alcoa Fastening Systems“ iz Engleske. Na ovaj način, klasičan postupakzaštite tarnih površina metalizacijom zamenjuje se jeftinijim, jednostavnijim i bržimpostupkom nanošenja premaza. Takođe, ispitivana je i opravdanost primene zavrtnjevasa zaključavanjem u poređenju sa klasičnim pregnapregnutim zavrtnjevima. Međutim,primena novog materijala kao antikoroziоne zaštite tarnih površina otvara pitanjegubitaka sile prednaprezanja u zavrtnjevima jer je opšte poznato da dominantan deoovih gubitaka potiče od promene debljine sloja antikorozione zaštite kroz vreme.Sprovedeno istraživanje ima dva osnovna cilja: da proveri opravdanost primenepredmetnog premaza u tarnim spojevima, sa stanovišta ostvarenog koeficijenta trenja isa stanovišta gubitaka sile prednaprezanja.Sprovedena su sopstvena eksperimentalna istraživanja i ispitano je 126 zavrtnjevau okviru 42 uzorka spojeva sa dvostrukim preklopom. Eksperimentalno istraživanje jezbog svog obima i raznolikosti podeljeno u nekoliko faza:- Određivanje fizičko-mehaničkih svojstava primenjenih materijala. Ova fazapodrazumeva određivanje koeficijenta trenja koji se ostvaruje primenompredmetnog cink silikatnog premaza kao i fizičko mehaničkih svojstava (granicerazvlačenja i zatezne čvrstoće) materijala od kog su izrađeni primenjeni HV iHBT zavrtnjevi;- Određivanje debljine nanetog premaza na svaku od čeličnih ploča od kojih suformirani uzorci;- Kalibracija sile u zavrtnjeva. Kao najracionalniji ali i najefikasniji način zamerenje sile u zavrtnju izabran je postupak ugradnje mernih traka u telozavrtnjeva. Nakon ugradnje mernih traka, a pre ugradnje zavrtnjeva u uzorke,izvršena je njihova kalibracija i tako uspostavljena veza između promene dužinezavrtnja (merne trake) i sile u zavrtnju. Neki dragoceni zaključci o raspodeli sileunutar zavrnjeva su izvedeni na bazi ovih rezultata.- Centralni deo istraživanja u kojem je izvršeno kontinuirano praćenje promenesile u zavrtnjevima i to 60 nedelja za prvo ugrađenih 36 zavrtnjeva, odnosno 24nedelje za preostalih 72 zavrtnja i- Ispitivanje 6 uzoraka (18 zavrtnjeva) na dejstvo dinamičkog opterećenja tokom2x106 ciklusa.Uzorci su formirani na način da se obezbedi variranje: vrste zavrtnja (HV i HBT),dužine zavrtnja preko različite debljine steznog paketa (18 mm, 35 mm i 55 mm),debljine premaza (uzorci sa i bez premaza) i vrste opterećenja uzorka (bez spoljašnjegopterećenja na uzorke i uzorci izloženi dejstvu dinamičkog opterećenja).Dobijeni rezultati potvrđuju opravdanost primene predmetnog premaza u tarnimspojevima, sa obzirom da su određeni koeficijenti trenja u intervalu 0,40-0,50. Takođe,za svaku grupu zavrtnjeva određeni su inicijalni, kratkoročni i dugoročni gubici sileprednaprezanja. Ekstrapolacijom rezultata sakupljenih u prve 24 nedelje na period od 20godina, za svaki tip i dužinu zavrtnja, definisana je kriva koja opisuje promenu sileprednaprezanja u zavrtnju u posmatranom periodu. Od svih ispitivanih zavrtnjeva jedinokod najkraćih HBT zavrtnjeva (dužine 55 mm) uočen je problem ostvarivanjaproračunske sile prednaprezanja. Kod zavrtnjeva ugrađenih u uzorke sa antikorozionomzaštitom gubici sile prednaprezanja značajno su veći od onih koji su ugrađeni u uzorkebez antikorozione zaštite. Uticaj dinamičkog opterećenja, definisanog tako da ne dovededo proklizavanja veze niti plastifikacije bilo kog njenog dela, može se zanemariti saaspekta gubitaka sile prednaprezanja. Takođe, može se zaključiti da je gubitak sileprednaprezanja najveći kod najkraćih zavrtnjeva i da opada sa povećanjem dužinezavrtnjeva. Primenom metode konačnih elemenata (MKE) modifikovani su postojećiizrazi za fleksibilnost HV zavrtnjeva i definisani novi za HBT zavrtnjeve. Takođe,primenom rezultata MKE i sopstvenog eksperimentalnog istraživanja, određena sureološka svojstva primenjenog cink-silikatnog premaza.Na osnovu rezultata sprovedenog istraživanja zaključuje se da je primenapredmetnih premaza kao i upotreba ispitivanih HBT zavrtnjeva u tarnim spojevimamoguća. Takođe, izvršena kvantifikacija gubitaka sile prednaprezanja omogućavaprojektantima da ih u postupku projektovanja uzmu u obzir i tako spreče gubitaknosivosti usled proklizavanja., Friction connections with high-strength pretension bolts are greatly important inthe field of steel structures, especially in structures imposed to dynamic loads, such asbridges, cranes and wind turbine towers. Two parameters mostly influencing the loadbearingcapacity of such connections are the friction coefficient on friction surfaces andthe achieved pretension force in high-strength bolts.In an effort to meet contemporary trends in the field of structural engineering,especially by usage of new materials, connections with state-of-the-art zinc-rich silicatebased coating as an anti-corrosive primer have been investigated in the scope of thisresearch. Such a commercial coating „Resist 86“, manufacturer by „Jotun“ in Norway,is used. Friction connections are formed using classical HV high-strength bolts but alsothe lock-bolts „Huck BobTail (HBT)“, manufactured by „Alcoa Fastening Systems“ inEngland, which are more and more frequently used in the field of structural engineering.In this way a classical procedure of providing metalized friction surfaces is replacedwith much cheaper, more simple and quicker coating process. At the same time lockboltsare analysed in terms of their applicability when compared to the classicalpretension bolts in use. On the other hand, application of the new material, which acts asanti-corrosion protection over friction surfaces, stirs debate with regards to pretensionforce loss in bolts as it is a commonly known fact that the dominant portion of theselosses stems from a change in anti-corrosion layer thickness which may emerge in time.The research in question strives at two principle goals: whether usage the coatingin question in tension connections is justified from the standpoint of achieved frictioncoefficient and from the standpoint of loss of the pretension force.Related experimental research has been conducted in which 126 bolts were testedwithin 42 double-lap joint specimens. The experimental works are divided into severalphases due to their large extent and variety:- Determination of physical and mechanical properties of the applied materials.This phase implies testing of friction coefficient which is achieved by applyingthe aforementioned zinc-based silicate coating, and the mechanical properties(yield strength and tensile strength) of the HV and HBT bolts materials;- Measuring the thickness of the coating applied to all the steel plates used to fromthe specimens;- Bolt force calibration. Bolt force measurement procedure relating to insertion ofstrain gauges into the bolts has been selected as the most rational and efficientone. After the strain gauges are fitted, and prior to assembling the bolts into thespecimens, bolt force is calibrated in means of determination of force-strainrelation for each bolt. Some significant conclusions about distribution of theforce in the bolt have been drawn relaying on these results.- The focal point of the research - continuous monitoring the changes in boltforces has been carried out over 60 weeks for the first batch of 36 bolts, and over24 weeks for the remaining 72 bolts;- Testing of 6 specimens (18 bolts) for dynamic loads in 2x106 cycles.Specimens have been formed in a way to allow variation of: bolt types (HV andHBT), bolt lengths for various clamping package thicknesses (18 mm, 35 mm and 55mm), coating thickness (with and without coating) and loading conditions (with noexternal load sustained by samples and samples exposed to dynamic loads).The obtained results justify the application of the investigated coating type infriction connections given that friction coefficients are in range of 0,40-0,50. Inaddition, initial short-term and long-term pretension force losses have been determinedfor each group of bolts. Results obtained within the first 24 weeks are extrapolated toperiod of 20 years where a curve which describes change in pretension force within timewas defined for each bolt type and bolt length separately. The shortest HBT bolts (55mm long) showed to be problematic with regards to achieving the design value ofpretension force. Pretension force losses are significant in bolts assembled to specimenswith the coating when compared to those without. Influence of the dynamic loads,which are below slip resistance of the connection, can be disregarded in means of lossof the pretension force. Additionally, the conclusion can be drawn that the pretensionforce loss is the largest in the case of shortest bolts and that it can be reduced byincreasing the bolt length. Using finite element method (FEM) for modelling theexperiments of calibration process of HV and HBT bolts, existing equations forflexibility of HV bolts are improved, and for the first time equations are defined forHBT bolts. Also, using the results of FEM and experimental research, rheologicalproperties of the applied zinc-silicate coating are determined.According to results obtained from the conducted research, application ofaforementioned coatings can be recommended, as well as the use of tested HBT bolts infriction connections. Quantification of pretension force loss allows for the engineers inpractice to take such data into consideration in the course of design development andprevention of overestimation of load-bearing capacity against slippage.",
publisher = "Универзитет у Београду, Грађевински факултет",
journal = "Универзитет у Београду",
title = "Teorijsko i eksperimentalno istraživanje gubitaka sile prednaprezanja u visokovrednim zavrtnjevima, Theoretical and experimental research of losses of pretension force in high strength bolts",
url = "https://hdl.handle.net/21.15107/rcub_nardus_4185"
}

Fric, N.. (2015). Teorijsko i eksperimentalno istraživanje gubitaka sile prednaprezanja u visokovrednim zavrtnjevima. in Универзитет у Београду
Универзитет у Београду, Грађевински факултет..
https://hdl.handle.net/21.15107/rcub_nardus_4185

Fric N. Teorijsko i eksperimentalno istraživanje gubitaka sile prednaprezanja u visokovrednim zavrtnjevima. in Универзитет у Београду. 2015;.
https://hdl.handle.net/21.15107/rcub_nardus_4185 .

Fric, Nenad, "Teorijsko i eksperimentalno istraživanje gubitaka sile prednaprezanja u visokovrednim zavrtnjevima" in Универзитет у Београду (2015),
https://hdl.handle.net/21.15107/rcub_nardus_4185 .

TY  - CONF
AU  - Fric, Nenad
AU  - Pavlović, Marko
AU  - Buđevac, Dragan
AU  - Mišković, Zoran
AU  - Marković, Zlatko
AU  - Gluhović, Nina
PY  - 2015
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2244
AB  - When applying high strength bolts in friction connections, in such case a load–bearing capacity depends on a pretension force in the bolts as well as on a friction coefficient found on friction surfaces. It is important to get the reliable value of the pretension force, which is why friction connections often undergo experimental research. In order to use strain gauges, which are inserted into the bolt shank, bolts need to be calibrated before we even use them in experimental research. Research that has been conducted shows a great difference between nominal and experimental strain in bolts, therefore FEA calibration of the bolts had to be carried out. Good results matching were obtained; hence a use of strain gauges was justified even for bolts without a shank.
PB  - MASE - Macedonian Association of Structural Engineers Faculty of Civil Engineering, Skopje, Republic of Macedonia
C3  - Proceedings 16th International Symposium Macedonian Association of Structural Engineers
T1  - Calibration of the bolt pretension by strain gauges vs. FEA
EP  - 493
SP  - 483
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2244
ER  - 

@conference{
author = "Fric, Nenad and Pavlović, Marko and Buđevac, Dragan and Mišković, Zoran and Marković, Zlatko and Gluhović, Nina",
year = "2015",
abstract = "When applying high strength bolts in friction connections, in such case a load–bearing capacity depends on a pretension force in the bolts as well as on a friction coefficient found on friction surfaces. It is important to get the reliable value of the pretension force, which is why friction connections often undergo experimental research. In order to use strain gauges, which are inserted into the bolt shank, bolts need to be calibrated before we even use them in experimental research. Research that has been conducted shows a great difference between nominal and experimental strain in bolts, therefore FEA calibration of the bolts had to be carried out. Good results matching were obtained; hence a use of strain gauges was justified even for bolts without a shank.",
publisher = "MASE - Macedonian Association of Structural Engineers Faculty of Civil Engineering, Skopje, Republic of Macedonia",
journal = "Proceedings 16th International Symposium Macedonian Association of Structural Engineers",
title = "Calibration of the bolt pretension by strain gauges vs. FEA",
pages = "493-483",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2244"
}

Fric, N., Pavlović, M., Buđevac, D., Mišković, Z., Marković, Z.,& Gluhović, N.. (2015). Calibration of the bolt pretension by strain gauges vs. FEA. in Proceedings 16th International Symposium Macedonian Association of Structural Engineers
MASE - Macedonian Association of Structural Engineers Faculty of Civil Engineering, Skopje, Republic of Macedonia., 483-493.
https://hdl.handle.net/21.15107/rcub_grafar_2244

Fric N, Pavlović M, Buđevac D, Mišković Z, Marković Z, Gluhović N. Calibration of the bolt pretension by strain gauges vs. FEA. in Proceedings 16th International Symposium Macedonian Association of Structural Engineers. 2015;:483-493.
https://hdl.handle.net/21.15107/rcub_grafar_2244 .

Fric, Nenad, Pavlović, Marko, Buđevac, Dragan, Mišković, Zoran, Marković, Zlatko, Gluhović, Nina, "Calibration of the bolt pretension by strain gauges vs. FEA" in Proceedings 16th International Symposium Macedonian Association of Structural Engineers (2015):483-493,
https://hdl.handle.net/21.15107/rcub_grafar_2244 .

TY  - CONF
AU  - Fric, Nenad
AU  - Buđevac, Dragan
AU  - Marković, Zlatko
AU  - Dobrić, Jelena
AU  - Isaković, Jovan
PY  - 2014
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1192
PB  - Univerzitet Crne Gore, Građevinski fakultet, Podgorica
C3  - Zbornik radova / Peti Internacionalni naučno-stručni skup Građevinarstvo nauka i praksa
T1  - Huck bobtail fastening system – new solution for high-strength lockbolts
EP  - 798
SP  - 791
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1192
ER  - 

@conference{
author = "Fric, Nenad and Buđevac, Dragan and Marković, Zlatko and Dobrić, Jelena and Isaković, Jovan",
year = "2014",
publisher = "Univerzitet Crne Gore, Građevinski fakultet, Podgorica",
journal = "Zbornik radova / Peti Internacionalni naučno-stručni skup Građevinarstvo nauka i praksa",
title = "Huck bobtail fastening system – new solution for high-strength lockbolts",
pages = "798-791",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1192"
}

Fric, N., Buđevac, D., Marković, Z., Dobrić, J.,& Isaković, J.. (2014). Huck bobtail fastening system – new solution for high-strength lockbolts. in Zbornik radova / Peti Internacionalni naučno-stručni skup Građevinarstvo nauka i praksa
Univerzitet Crne Gore, Građevinski fakultet, Podgorica., 791-798.
https://hdl.handle.net/21.15107/rcub_grafar_1192

Fric N, Buđevac D, Marković Z, Dobrić J, Isaković J. Huck bobtail fastening system – new solution for high-strength lockbolts. in Zbornik radova / Peti Internacionalni naučno-stručni skup Građevinarstvo nauka i praksa. 2014;:791-798.
https://hdl.handle.net/21.15107/rcub_grafar_1192 .

Fric, Nenad, Buđevac, Dragan, Marković, Zlatko, Dobrić, Jelena, Isaković, Jovan, "Huck bobtail fastening system – new solution for high-strength lockbolts" in Zbornik radova / Peti Internacionalni naučno-stručni skup Građevinarstvo nauka i praksa (2014):791-798,
https://hdl.handle.net/21.15107/rcub_grafar_1192 .

TY  - CONF
AU  - Marković, Zlatko
AU  - Gluhović, Nina
AU  - Dobrić, Jelena
AU  - Fric, Nenad
PY  - 2014
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1242
AB  - Connections made by use of wide end plates, i.e., by means of four bolts in one row are widely used in steel structures, i.e., in building engineering. On the other hand, the applicable version of European standard EN 1993-1-8, does not provide recommendations for designing of such connections but rather limits itself to application of somewhat narrow bonds). Extensive research has been conducted in recent years throughout Europe in order to extend implementation of Eurocode with regards to connections made by wide end plates. This paper will show the latest research conducted in this engineering field, as well as key calculation points relating to resistance of a rigid joint made by use of four bolts in one row.
AB  - Veze sa širokom čeonom pločom, odnosno sa četiri zavrtnja u redu imaju značajnu primenu u čeličnim konstrukcijama u zgradarstvu. Međutim, trenutna verzija evropskog standarda EN 1993-1-8, ne daje preporuke za projektovanje ovakvih veza, već se ograničava samo na primenu uskih veza. Proteklih godina širom Evrope su vršena istraživanja sa ciljem da se proširi primena evrokoda i na veze sa širokim čeonim pločama. U ovom radu su prikazana najnovija istraživanja u ovoj oblasti, kao i osnovne specifičnosti proračuna nosivosti momentne veze sa četiri zavrtnja u jednom redu.
PB  - Univerzitet Crne Gore, Građevinski fakultet, Podgorica
C3  - Zbornik radova / Peti Internacionalni naučno-stručni skup Građevinarstvo nauka i praksa
T1  - The latest European recommendations with regards to beam-column end plate connections
T1  - Najnovije evropske preporuke za proračun širokih veza greda-stub sa čeonom pločom
EP  - 1308
SP  - 1301
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1242
ER  - 

@conference{
author = "Marković, Zlatko and Gluhović, Nina and Dobrić, Jelena and Fric, Nenad",
year = "2014",
abstract = "Connections made by use of wide end plates, i.e., by means of four bolts in one row are widely used in steel structures, i.e., in building engineering. On the other hand, the applicable version of European standard EN 1993-1-8, does not provide recommendations for designing of such connections but rather limits itself to application of somewhat narrow bonds). Extensive research has been conducted in recent years throughout Europe in order to extend implementation of Eurocode with regards to connections made by wide end plates. This paper will show the latest research conducted in this engineering field, as well as key calculation points relating to resistance of a rigid joint made by use of four bolts in one row., Veze sa širokom čeonom pločom, odnosno sa četiri zavrtnja u redu imaju značajnu primenu u čeličnim konstrukcijama u zgradarstvu. Međutim, trenutna verzija evropskog standarda EN 1993-1-8, ne daje preporuke za projektovanje ovakvih veza, već se ograničava samo na primenu uskih veza. Proteklih godina širom Evrope su vršena istraživanja sa ciljem da se proširi primena evrokoda i na veze sa širokim čeonim pločama. U ovom radu su prikazana najnovija istraživanja u ovoj oblasti, kao i osnovne specifičnosti proračuna nosivosti momentne veze sa četiri zavrtnja u jednom redu.",
publisher = "Univerzitet Crne Gore, Građevinski fakultet, Podgorica",
journal = "Zbornik radova / Peti Internacionalni naučno-stručni skup Građevinarstvo nauka i praksa",
title = "The latest European recommendations with regards to beam-column end plate connections, Najnovije evropske preporuke za proračun širokih veza greda-stub sa čeonom pločom",
pages = "1308-1301",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1242"
}

Marković, Z., Gluhović, N., Dobrić, J.,& Fric, N.. (2014). The latest European recommendations with regards to beam-column end plate connections. in Zbornik radova / Peti Internacionalni naučno-stručni skup Građevinarstvo nauka i praksa
Univerzitet Crne Gore, Građevinski fakultet, Podgorica., 1301-1308.
https://hdl.handle.net/21.15107/rcub_grafar_1242

Marković Z, Gluhović N, Dobrić J, Fric N. The latest European recommendations with regards to beam-column end plate connections. in Zbornik radova / Peti Internacionalni naučno-stručni skup Građevinarstvo nauka i praksa. 2014;:1301-1308.
https://hdl.handle.net/21.15107/rcub_grafar_1242 .

Marković, Zlatko, Gluhović, Nina, Dobrić, Jelena, Fric, Nenad, "The latest European recommendations with regards to beam-column end plate connections" in Zbornik radova / Peti Internacionalni naučno-stručni skup Građevinarstvo nauka i praksa (2014):1301-1308,
https://hdl.handle.net/21.15107/rcub_grafar_1242 .