TY  - CONF
AU  - Nikolić, Jelena
AU  - Kostić, Svetlana M.
AU  - Deretić-Stojanović, Biljana
PY  - 2021
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2364
AB  - The paper compares the following methods for analysis of composite steel-concrete beams: the
“exact” analysis method, simplified method, effective modulus method and the method proposed
by Eurocode 4 design code. The exact analysis method is based on the application of linear
integral operators. Simplified analysis is derived from the exact method and adopts the
assumption that generalized displacements change linearly with the concrete creep function.
Effective modulus method and the method proposed by the Eurocode 4 design code are algebraic
methods, widely used in practice. The results obtained using the mentioned four methods are
compared on one example.
PB  - Univerzitet u Beogradu Građevinski fakultet
PB  - Društvo građevinskih konstruktera Srbije
C3  - 16th Congress hosted by Association of Structural Engineers of Serbia
T1  - Composite Steel-Concrete Beam Analysis using Different Methods
EP  - 336
SP  - 330
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2364
ER  - 

@conference{
author = "Nikolić, Jelena and Kostić, Svetlana M. and Deretić-Stojanović, Biljana",
year = "2021",
abstract = "The paper compares the following methods for analysis of composite steel-concrete beams: the
“exact” analysis method, simplified method, effective modulus method and the method proposed
by Eurocode 4 design code. The exact analysis method is based on the application of linear
integral operators. Simplified analysis is derived from the exact method and adopts the
assumption that generalized displacements change linearly with the concrete creep function.
Effective modulus method and the method proposed by the Eurocode 4 design code are algebraic
methods, widely used in practice. The results obtained using the mentioned four methods are
compared on one example.",
publisher = "Univerzitet u Beogradu Građevinski fakultet, Društvo građevinskih konstruktera Srbije",
journal = "16th Congress hosted by Association of Structural Engineers of Serbia",
title = "Composite Steel-Concrete Beam Analysis using Different Methods",
pages = "336-330",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2364"
}

Nikolić, J., Kostić, S. M.,& Deretić-Stojanović, B.. (2021). Composite Steel-Concrete Beam Analysis using Different Methods. in 16th Congress hosted by Association of Structural Engineers of Serbia
Univerzitet u Beogradu Građevinski fakultet., 330-336.
https://hdl.handle.net/21.15107/rcub_grafar_2364

Nikolić J, Kostić SM, Deretić-Stojanović B. Composite Steel-Concrete Beam Analysis using Different Methods. in 16th Congress hosted by Association of Structural Engineers of Serbia. 2021;:330-336.
https://hdl.handle.net/21.15107/rcub_grafar_2364 .

Nikolić, Jelena, Kostić, Svetlana M., Deretić-Stojanović, Biljana, "Composite Steel-Concrete Beam Analysis using Different Methods" in 16th Congress hosted by Association of Structural Engineers of Serbia (2021):330-336,
https://hdl.handle.net/21.15107/rcub_grafar_2364 .

TY  - CHAP
AU  - Kostić, Svetlana M.
AU  - Deretić-Stojanović, Biljana
PY  - 2019
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2127
AB  - The paper presents four different methods for viscoelastic analysis of steel-concrete composite structures: “exact” analysis method, simplified method, effective modulus method and method proposed by the European design code, Eurocode 4. The exact analysis method uses the mathematical theory of linear integral operators for presenting viscoelastic relations of the steel-concrete composite structures. The simplified analysis method is derived from the exact method. It adopts the assumption that generalized displacements change linearly with the concrete creep function. Due to this assumption, the problem equations transforms from nonhomogeneous integral equations to nonhomogeneous algebraic equations. The effective modulus method and the method proposed by the Eurocode 4 are algebraic methods where stress-strain relations for concrete are expressed through the effective modulus, which depend on time. On the numerical example of continuous steel-concrete beam, the results obtained using the mentioned approximate and the exact method are compared
PB  - Univerzitet u Beogradu–Građevinski fakultet
PB  - Univerzitet Crne Gore–Građevinski fakultet
PB  - Akademija inženjerskih nauka Srbije
T2  - Teorija građevinskih konstrukcija
T1  - Tačna i približne metode proračuna spregnutih greda od čelika i betona
T1  - EXACT AND APPROXIMATE METHODS OF ANALYSIS OF STEEL-CONCRETE COMPOSITE BEAMS
EP  - 120
SP  - 113
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2127
ER  - 

@inbook{
author = "Kostić, Svetlana M. and Deretić-Stojanović, Biljana",
year = "2019",
abstract = "The paper presents four different methods for viscoelastic analysis of steel-concrete composite structures: “exact” analysis method, simplified method, effective modulus method and method proposed by the European design code, Eurocode 4. The exact analysis method uses the mathematical theory of linear integral operators for presenting viscoelastic relations of the steel-concrete composite structures. The simplified analysis method is derived from the exact method. It adopts the assumption that generalized displacements change linearly with the concrete creep function. Due to this assumption, the problem equations transforms from nonhomogeneous integral equations to nonhomogeneous algebraic equations. The effective modulus method and the method proposed by the Eurocode 4 are algebraic methods where stress-strain relations for concrete are expressed through the effective modulus, which depend on time. On the numerical example of continuous steel-concrete beam, the results obtained using the mentioned approximate and the exact method are compared",
publisher = "Univerzitet u Beogradu–Građevinski fakultet, Univerzitet Crne Gore–Građevinski fakultet, Akademija inženjerskih nauka Srbije",
journal = "Teorija građevinskih konstrukcija",
booktitle = "Tačna i približne metode proračuna spregnutih greda od čelika i betona, EXACT AND APPROXIMATE METHODS OF ANALYSIS OF STEEL-CONCRETE COMPOSITE BEAMS",
pages = "120-113",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2127"
}

Kostić, S. M.,& Deretić-Stojanović, B.. (2019). Tačna i približne metode proračuna spregnutih greda od čelika i betona. in Teorija građevinskih konstrukcija
Univerzitet u Beogradu–Građevinski fakultet., 113-120.
https://hdl.handle.net/21.15107/rcub_grafar_2127

Kostić SM, Deretić-Stojanović B. Tačna i približne metode proračuna spregnutih greda od čelika i betona. in Teorija građevinskih konstrukcija. 2019;:113-120.
https://hdl.handle.net/21.15107/rcub_grafar_2127 .

Kostić, Svetlana M., Deretić-Stojanović, Biljana, "Tačna i približne metode proračuna spregnutih greda od čelika i betona" in Teorija građevinskih konstrukcija (2019):113-120,
https://hdl.handle.net/21.15107/rcub_grafar_2127 .

TY  - JOUR
AU  - Lazović Radovanović, Marija
AU  - Deretić-Stojanović, Biljana
AU  - Radovanović, Janko
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/915
AB  - In this paper, results of experimental investigation of bearing capacity and stability of slender and moderately slender CFT circular tubes are presented. The effects of ratio thickness/ radius of steel cross section and support conditions are investigated. Numerical simulation for the tested examples was performed in computer program ABAQUS. In this simulations, nonlinear constitutive models were used for modelling of concrete, steel and concrete/steel connection. With modified Rick's method critical buckling force for the CFT column was calculated. Verification of the obtained experimental results was performed with comparison with several world standards: EC4, ACI, AS, AISC, as well as with the results obtained in ABAQUS.
AB  - U radu su prikazani program i rezultati eksperimentalnog ispitivanja nosivosti i stabilnosti umereno vitkih i vitkih kružnih CFT stubova. Analiziran je uticaj odnosa prečnika i debljine zida čeličnog profila, kao i uticaj graničnih uslova oslanjanja na vrednost kritične sile izvijanja. Izvršena je i numerička simulacija ispitanih uzoraka primenom metode konačnih elemenata i računarskog programa ABAQUS. U modelu su zadati nelinearni konstitutivni modeli za beton jezgra i konstrukcioni čelik šupljeg profila, kao i veza ova dva elementa. Primenom modifikovane Riks-ove metode sračunata je kritična sila izvijanja CFT stuba. Verifikacija rezultata izvršena je upoređivanjem sopstvenih eksperimentalnih rezultata s važećim pravilnicima: EC4, ACI, AS, AISC, kao i s rezultatima dobijenim primenom računarskog programa ABAQUS.
PB  - Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije, Beograd
T2  - Građevinski materijali i konstrukcije
T1  - Calculation of load capacity and stability of moderately slender and slender axial loaded circular CFT columns
T1  - Proračun nosivosti i stabilnosti umereno vitkih i vitkih centrično pritisnutih kružnih CFT stubova
EP  - 72
IS  - 2
SP  - 57
VL  - 61
DO  - 10.5937/grmk1802057l
ER  - 

@article{
author = "Lazović Radovanović, Marija and Deretić-Stojanović, Biljana and Radovanović, Janko",
year = "2018",
abstract = "In this paper, results of experimental investigation of bearing capacity and stability of slender and moderately slender CFT circular tubes are presented. The effects of ratio thickness/ radius of steel cross section and support conditions are investigated. Numerical simulation for the tested examples was performed in computer program ABAQUS. In this simulations, nonlinear constitutive models were used for modelling of concrete, steel and concrete/steel connection. With modified Rick's method critical buckling force for the CFT column was calculated. Verification of the obtained experimental results was performed with comparison with several world standards: EC4, ACI, AS, AISC, as well as with the results obtained in ABAQUS., U radu su prikazani program i rezultati eksperimentalnog ispitivanja nosivosti i stabilnosti umereno vitkih i vitkih kružnih CFT stubova. Analiziran je uticaj odnosa prečnika i debljine zida čeličnog profila, kao i uticaj graničnih uslova oslanjanja na vrednost kritične sile izvijanja. Izvršena je i numerička simulacija ispitanih uzoraka primenom metode konačnih elemenata i računarskog programa ABAQUS. U modelu su zadati nelinearni konstitutivni modeli za beton jezgra i konstrukcioni čelik šupljeg profila, kao i veza ova dva elementa. Primenom modifikovane Riks-ove metode sračunata je kritična sila izvijanja CFT stuba. Verifikacija rezultata izvršena je upoređivanjem sopstvenih eksperimentalnih rezultata s važećim pravilnicima: EC4, ACI, AS, AISC, kao i s rezultatima dobijenim primenom računarskog programa ABAQUS.",
publisher = "Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije, Beograd",
journal = "Građevinski materijali i konstrukcije",
title = "Calculation of load capacity and stability of moderately slender and slender axial loaded circular CFT columns, Proračun nosivosti i stabilnosti umereno vitkih i vitkih centrično pritisnutih kružnih CFT stubova",
pages = "72-57",
number = "2",
volume = "61",
doi = "10.5937/grmk1802057l"
}

Lazović Radovanović, M., Deretić-Stojanović, B.,& Radovanović, J.. (2018). Calculation of load capacity and stability of moderately slender and slender axial loaded circular CFT columns. in Građevinski materijali i konstrukcije
Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije, Beograd., 61(2), 57-72.
https://doi.org/10.5937/grmk1802057l

Lazović Radovanović M, Deretić-Stojanović B, Radovanović J. Calculation of load capacity and stability of moderately slender and slender axial loaded circular CFT columns. in Građevinski materijali i konstrukcije. 2018;61(2):57-72.
doi:10.5937/grmk1802057l .

Lazović Radovanović, Marija, Deretić-Stojanović, Biljana, Radovanović, Janko, "Calculation of load capacity and stability of moderately slender and slender axial loaded circular CFT columns" in Građevinski materijali i konstrukcije, 61, no. 2 (2018):57-72,
https://doi.org/10.5937/grmk1802057l . .

TY  - CONF
AU  - Kostić, Svetlana M.
AU  - Deretić-Stojanović, Biljana
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1598
AB  - In  this  paper,  the  methods  for  determination  of  the  bending  resistance  of  composite  beams  with  partial  shear  connection  and  nonductile  shear  connectors,  according  to  Eurocode  4,  are  studied.  The  Eurocode  4  predicts  the  use  of  two  calculation  methods:  the  method  based  on  the  nonlinear  theory  and  the  simplified  method  that  assume  linear  relation  between  elastic  and  plastic  bending  moment  resistance. The algorithm for the nonlinear section analysis is explained in detail. Using the own computer program for nonlinear section analysis, for one composite beam cross section, the differences in results obtained by these two proposed methods are discussed.
PB  - Faculty of Civil Engineeirng, Subotica
C3  - Conference proceedings 6th international conference Contemporary Achievements in Civil Engineering 2018
T1  - Bending resistance of composite beams with nonductile shear connectors
T1  - Nosivost na savijanje spregnutih greda sa neduktilnim moždanicima
EP  - 32
SP  - 25
VL  - 34
DO  - 10.14415/konferencijaGFS2018.001
ER  - 

@conference{
author = "Kostić, Svetlana M. and Deretić-Stojanović, Biljana",
year = "2018",
abstract = "In  this  paper,  the  methods  for  determination  of  the  bending  resistance  of  composite  beams  with  partial  shear  connection  and  nonductile  shear  connectors,  according  to  Eurocode  4,  are  studied.  The  Eurocode  4  predicts  the  use  of  two  calculation  methods:  the  method  based  on  the  nonlinear  theory  and  the  simplified  method  that  assume  linear  relation  between  elastic  and  plastic  bending  moment  resistance. The algorithm for the nonlinear section analysis is explained in detail. Using the own computer program for nonlinear section analysis, for one composite beam cross section, the differences in results obtained by these two proposed methods are discussed.",
publisher = "Faculty of Civil Engineeirng, Subotica",
journal = "Conference proceedings 6th international conference Contemporary Achievements in Civil Engineering 2018",
title = "Bending resistance of composite beams with nonductile shear connectors, Nosivost na savijanje spregnutih greda sa neduktilnim moždanicima",
pages = "32-25",
volume = "34",
doi = "10.14415/konferencijaGFS2018.001"
}

Kostić, S. M.,& Deretić-Stojanović, B.. (2018). Bending resistance of composite beams with nonductile shear connectors. in Conference proceedings 6th international conference Contemporary Achievements in Civil Engineering 2018
Faculty of Civil Engineeirng, Subotica., 34, 25-32.
https://doi.org/10.14415/konferencijaGFS2018.001

Kostić SM, Deretić-Stojanović B. Bending resistance of composite beams with nonductile shear connectors. in Conference proceedings 6th international conference Contemporary Achievements in Civil Engineering 2018. 2018;34:25-32.
doi:10.14415/konferencijaGFS2018.001 .

Kostić, Svetlana M., Deretić-Stojanović, Biljana, "Bending resistance of composite beams with nonductile shear connectors" in Conference proceedings 6th international conference Contemporary Achievements in Civil Engineering 2018, 34 (2018):25-32,
https://doi.org/10.14415/konferencijaGFS2018.001 . .

TY  - JOUR
AU  - Kostić, Svetlana M.
AU  - Deretić-Stojanović, Biljana
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/980
AB  - The paper presents the nonlinear section analysis for composite steel-concrete beams with different degrees of shear connection. The analysis is fiber based, i.c., integration over the cross section is performed numerically, and any uniaxial nonlinear material model can be assigned to the steel and concrete parts of the cross section or to the reinforcement bars. The analysis assumed full interaction between steel and concrete and therefore, is suitable for analysis of composite steel-concrete beam cross sections with nonductile shear connectors. Its accuracy is verified on few experimental results. The presented section analysis is used in the parameter study in order to evaluate different methods proposed by design codes for determining the bending moment resistance of composite cross sections with nonductile shear connectors and different degrees of shear connection. The following effects are considered: variation of concrete and steel material models, presence of slab reinforcement, and creep of concrete. Special attention is paid on two different constructional methods: propped and unpropped. The weaknesses of the simplified design method in determining bending moment resistance are identified and recommendations for practical design analysis are formulated.
PB  - Hindawi Limited
T2  - Advances in Civil Engineering
T1  - Bending Resistance of Composite Sections with Nonductile Shear Connectors and Partial Shear Connection
DO  - 10.1155/2018/5350315
ER  - 

@article{
author = "Kostić, Svetlana M. and Deretić-Stojanović, Biljana",
year = "2018",
abstract = "The paper presents the nonlinear section analysis for composite steel-concrete beams with different degrees of shear connection. The analysis is fiber based, i.c., integration over the cross section is performed numerically, and any uniaxial nonlinear material model can be assigned to the steel and concrete parts of the cross section or to the reinforcement bars. The analysis assumed full interaction between steel and concrete and therefore, is suitable for analysis of composite steel-concrete beam cross sections with nonductile shear connectors. Its accuracy is verified on few experimental results. The presented section analysis is used in the parameter study in order to evaluate different methods proposed by design codes for determining the bending moment resistance of composite cross sections with nonductile shear connectors and different degrees of shear connection. The following effects are considered: variation of concrete and steel material models, presence of slab reinforcement, and creep of concrete. Special attention is paid on two different constructional methods: propped and unpropped. The weaknesses of the simplified design method in determining bending moment resistance are identified and recommendations for practical design analysis are formulated.",
publisher = "Hindawi Limited",
journal = "Advances in Civil Engineering",
title = "Bending Resistance of Composite Sections with Nonductile Shear Connectors and Partial Shear Connection",
doi = "10.1155/2018/5350315"
}

Kostić, S. M.,& Deretić-Stojanović, B.. (2018). Bending Resistance of Composite Sections with Nonductile Shear Connectors and Partial Shear Connection. in Advances in Civil Engineering
Hindawi Limited..
https://doi.org/10.1155/2018/5350315

Kostić SM, Deretić-Stojanović B. Bending Resistance of Composite Sections with Nonductile Shear Connectors and Partial Shear Connection. in Advances in Civil Engineering. 2018;.
doi:10.1155/2018/5350315 .

Kostić, Svetlana M., Deretić-Stojanović, Biljana, "Bending Resistance of Composite Sections with Nonductile Shear Connectors and Partial Shear Connection" in Advances in Civil Engineering (2018),
https://doi.org/10.1155/2018/5350315 . .

TY  - CONF
AU  - Kostić, Svetlana M.
AU  - Deretić-Stojanović, Biljana
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1645
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  - Two numerical models for nonlinear analysis of CFT columns
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1645
ER  - 

@conference{
author = "Kostić, Svetlana M. and Deretić-Stojanović, Biljana",
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 = "Two numerical models for nonlinear analysis of CFT columns",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1645"
}

Kostić, S. M.,& Deretić-Stojanović, B.. (2018). Two numerical models for nonlinear analysis of CFT columns. in ASES International congress proceedings / Association of Structural Engineers of Serbia, 15th Congress, September 6-8th, 2018, Zlatibor
Društvo građevinskih konstruktera Srbije, Beograd..
https://hdl.handle.net/21.15107/rcub_grafar_1645

Kostić SM, Deretić-Stojanović B. Two numerical models for nonlinear analysis of CFT columns. in ASES International congress proceedings / Association of Structural Engineers of Serbia, 15th Congress, September 6-8th, 2018, Zlatibor. 2018;.
https://hdl.handle.net/21.15107/rcub_grafar_1645 .

Kostić, Svetlana M., Deretić-Stojanović, Biljana, "Two numerical models for nonlinear analysis of CFT columns" in ASES International congress proceedings / Association of Structural Engineers of Serbia, 15th Congress, September 6-8th, 2018, Zlatibor (2018),
https://hdl.handle.net/21.15107/rcub_grafar_1645 .

TY  - JOUR
AU  - Lazović Radovanović, Marija
AU  - Radovanović, Janko
AU  - Deretić-Stojanović, Biljana
PY  - 2017
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/844
AB  - CFT columns are one of the basic structural elements in "top-down" construction method. Because of the large depth of excavation the question of stability of these columns raises. This paper presents a procedure for calculation of critical buckling force of CFT columns which are on the upper side elastically fixed in the concrete ceiling and on the bottom side elastically fixed in the drilled pile. Using computer programs ABAQUS 6.12 and LPILE, as well as appropriate constitutive models the boundary conditions on the upper and lower end of the CFT columns are determined. For a building called "Cvijetni prolaz" in Zagreb, using program created in Excel the critical buckling force of elastically fixed CFT columns is determined. The dependence of the critical buckling force decreasing with increasing depth of excavation is presented. The impact of concrete class, diameter and wall thickness of the steel section, length and diameter of the pile, the thickness of the ceiling on the critical buckling force of CFT columns is analysed. The results are shown in diagrams and tables.
PB  - Strojarski Facultet
T2  - Tehnički vjesnik / Technical Gazette
T1  - Bearing capacity and stability of elastically fixed cft slender columns
EP  - 973
IS  - 3
SP  - 967
VL  - 24
DO  - 10.17559/TV-20150806093823
ER  - 

@article{
author = "Lazović Radovanović, Marija and Radovanović, Janko and Deretić-Stojanović, Biljana",
year = "2017",
abstract = "CFT columns are one of the basic structural elements in "top-down" construction method. Because of the large depth of excavation the question of stability of these columns raises. This paper presents a procedure for calculation of critical buckling force of CFT columns which are on the upper side elastically fixed in the concrete ceiling and on the bottom side elastically fixed in the drilled pile. Using computer programs ABAQUS 6.12 and LPILE, as well as appropriate constitutive models the boundary conditions on the upper and lower end of the CFT columns are determined. For a building called "Cvijetni prolaz" in Zagreb, using program created in Excel the critical buckling force of elastically fixed CFT columns is determined. The dependence of the critical buckling force decreasing with increasing depth of excavation is presented. The impact of concrete class, diameter and wall thickness of the steel section, length and diameter of the pile, the thickness of the ceiling on the critical buckling force of CFT columns is analysed. The results are shown in diagrams and tables.",
publisher = "Strojarski Facultet",
journal = "Tehnički vjesnik / Technical Gazette",
title = "Bearing capacity and stability of elastically fixed cft slender columns",
pages = "973-967",
number = "3",
volume = "24",
doi = "10.17559/TV-20150806093823"
}

Lazović Radovanović, M., Radovanović, J.,& Deretić-Stojanović, B.. (2017). Bearing capacity and stability of elastically fixed cft slender columns. in Tehnički vjesnik / Technical Gazette
Strojarski Facultet., 24(3), 967-973.
https://doi.org/10.17559/TV-20150806093823

Lazović Radovanović M, Radovanović J, Deretić-Stojanović B. Bearing capacity and stability of elastically fixed cft slender columns. in Tehnički vjesnik / Technical Gazette. 2017;24(3):967-973.
doi:10.17559/TV-20150806093823 .

Lazović Radovanović, Marija, Radovanović, Janko, Deretić-Stojanović, Biljana, "Bearing capacity and stability of elastically fixed cft slender columns" in Tehnički vjesnik / Technical Gazette, 24, no. 3 (2017):967-973,
https://doi.org/10.17559/TV-20150806093823 . .

TY  - CONF
AU  - Kostić, Svetlana M.
AU  - Deretić-Stojanović, Biljana
PY  - 2017
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1530
PB  - Serbian Society of Mechanics ; Faculty of Mechanical Engineering, University of Belgrade,Belgrade, Belgrade
C3  - Proceedings / The 6th International Congress of Serbian Society of Mechanics, Tara, June 19-21, 2017
T1  - An efficient model for nonlinear analysis of circular CFT columns
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1530
ER  - 

@conference{
author = "Kostić, Svetlana M. and Deretić-Stojanović, Biljana",
year = "2017",
publisher = "Serbian Society of Mechanics ; Faculty of Mechanical Engineering, University of Belgrade,Belgrade, Belgrade",
journal = "Proceedings / The 6th International Congress of Serbian Society of Mechanics, Tara, June 19-21, 2017",
title = "An efficient model for nonlinear analysis of circular CFT columns",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1530"
}

Kostić, S. M.,& Deretić-Stojanović, B.. (2017). An efficient model for nonlinear analysis of circular CFT columns. in Proceedings / The 6th International Congress of Serbian Society of Mechanics, Tara, June 19-21, 2017
Serbian Society of Mechanics ; Faculty of Mechanical Engineering, University of Belgrade,Belgrade, Belgrade..
https://hdl.handle.net/21.15107/rcub_grafar_1530

Kostić SM, Deretić-Stojanović B. An efficient model for nonlinear analysis of circular CFT columns. in Proceedings / The 6th International Congress of Serbian Society of Mechanics, Tara, June 19-21, 2017. 2017;.
https://hdl.handle.net/21.15107/rcub_grafar_1530 .

Kostić, Svetlana M., Deretić-Stojanović, Biljana, "An efficient model for nonlinear analysis of circular CFT columns" in Proceedings / The 6th International Congress of Serbian Society of Mechanics, Tara, June 19-21, 2017 (2017),
https://hdl.handle.net/21.15107/rcub_grafar_1530 .

TY  - JOUR
AU  - Deretić-Stojanović, Biljana
AU  - Kostić, Svetlana M.
PY  - 2017
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/878
AB  - The paper presents the simplified matrix stiffness method for analysis of composite and prestressed beams. The method is based on the previously developed "exact" analysis method that uses the mathematical theory of linear integral operators to derive all relations without any mathematical simplifications besides inevitable idealizations related to the material rheological properties. However, the method is limited since the closed-form solution can be found only for specific forms of the concrete creep function. In this paper, the authors proposed the simplified analysis method by introducing the assumption that the unknown deformations change linearly with the concrete creep function. Adopting this assumption, the nonhomogeneous integral system of equations of the "exact" method simplifies to the system of algebraic equations that can be easily solved. Therefore, the proposed method is more suitable for practical applications. Its high level of accuracy in comparison to the "exact" method is preserved, which is illustrated on the numerical example. Also, it is more accurate than the well-known EM method.
PB  - Techno Press
T2  - Steel and Composite Structures
T1  - A simplified matrix stiffness method for analysis of composite and prestressed beams
EP  - 63
IS  - 1
SP  - 53
VL  - 24
DO  - 10.12989/scs.2017.24.1.053
ER  - 

@article{
author = "Deretić-Stojanović, Biljana and Kostić, Svetlana M.",
year = "2017",
abstract = "The paper presents the simplified matrix stiffness method for analysis of composite and prestressed beams. The method is based on the previously developed "exact" analysis method that uses the mathematical theory of linear integral operators to derive all relations without any mathematical simplifications besides inevitable idealizations related to the material rheological properties. However, the method is limited since the closed-form solution can be found only for specific forms of the concrete creep function. In this paper, the authors proposed the simplified analysis method by introducing the assumption that the unknown deformations change linearly with the concrete creep function. Adopting this assumption, the nonhomogeneous integral system of equations of the "exact" method simplifies to the system of algebraic equations that can be easily solved. Therefore, the proposed method is more suitable for practical applications. Its high level of accuracy in comparison to the "exact" method is preserved, which is illustrated on the numerical example. Also, it is more accurate than the well-known EM method.",
publisher = "Techno Press",
journal = "Steel and Composite Structures",
title = "A simplified matrix stiffness method for analysis of composite and prestressed beams",
pages = "63-53",
number = "1",
volume = "24",
doi = "10.12989/scs.2017.24.1.053"
}

Deretić-Stojanović, B.,& Kostić, S. M.. (2017). A simplified matrix stiffness method for analysis of composite and prestressed beams. in Steel and Composite Structures
Techno Press., 24(1), 53-63.
https://doi.org/10.12989/scs.2017.24.1.053

Deretić-Stojanović B, Kostić SM. A simplified matrix stiffness method for analysis of composite and prestressed beams. in Steel and Composite Structures. 2017;24(1):53-63.
doi:10.12989/scs.2017.24.1.053 .

Deretić-Stojanović, Biljana, Kostić, Svetlana M., "A simplified matrix stiffness method for analysis of composite and prestressed beams" in Steel and Composite Structures, 24, no. 1 (2017):53-63,
https://doi.org/10.12989/scs.2017.24.1.053 . .

TY  - JOUR
AU  - Kostić, Svetlana M.
AU  - Deretić-Stojanović, Biljana
PY  - 2016
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/788
AB  - The paper discusses two formulations for the fiber based distributed plasticity beam/column element. For force based and displacement based formulations, basic details and main differences are emphasized. The differences in results of analysis when elements with these two formulations are used are demonstrated on two numerical examples. The first example involves the nonlinear static pushover analysis of low-rise frame with distributed element loading. The second example is nonlinear time history analysis of two-story frame subjected to earthquake loading. The differences in global and local response depending on the used finite element discretization are shown. In conclusion, the advantages of force based formulation and directions for the use of the two elements are summarized.
AB  - U radu su prikazane dve formulacije fiber konačnog elementa raspodeljene plastičnosti. Za metodu sila i metodu deformacija, ukazano je na osnovne razlike dve metode. Razlike u rezultatima analize koje se dobijaju primenom fiber elementa prema ove dve formulacije prikazane su putem dva numerička primera. Prvi primer obuhvata statičku pushover analizu rama s raspodeljenim opterećenjem duž greda. Drugi primer je nelinearna dinamička analiza dvospratnog rama izloženog zemljotresnom opterećenju. Prikazane su razlike kod dobijenog globalnog i lokalnog odgovora u zavisnosti od formulacije i diskretizacije rama. U zaključku, rezimirane su primene dve formulacije fiber elementa i date napomene u vezi s njihovim korišćenjem.
PB  - Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije, Beograd
T2  - Građevinski materijali i konstrukcije
T1  - Fiber element formulation for inelastic frame analysis
T1  - Formulacija fiber elementa prilikom nelinearne analize ramova
EP  - 13
IS  - 2
SP  - 3
VL  - 59
DO  - 10.5937/grmk1602003K
ER  - 

@article{
author = "Kostić, Svetlana M. and Deretić-Stojanović, Biljana",
year = "2016",
abstract = "The paper discusses two formulations for the fiber based distributed plasticity beam/column element. For force based and displacement based formulations, basic details and main differences are emphasized. The differences in results of analysis when elements with these two formulations are used are demonstrated on two numerical examples. The first example involves the nonlinear static pushover analysis of low-rise frame with distributed element loading. The second example is nonlinear time history analysis of two-story frame subjected to earthquake loading. The differences in global and local response depending on the used finite element discretization are shown. In conclusion, the advantages of force based formulation and directions for the use of the two elements are summarized., U radu su prikazane dve formulacije fiber konačnog elementa raspodeljene plastičnosti. Za metodu sila i metodu deformacija, ukazano je na osnovne razlike dve metode. Razlike u rezultatima analize koje se dobijaju primenom fiber elementa prema ove dve formulacije prikazane su putem dva numerička primera. Prvi primer obuhvata statičku pushover analizu rama s raspodeljenim opterećenjem duž greda. Drugi primer je nelinearna dinamička analiza dvospratnog rama izloženog zemljotresnom opterećenju. Prikazane su razlike kod dobijenog globalnog i lokalnog odgovora u zavisnosti od formulacije i diskretizacije rama. U zaključku, rezimirane su primene dve formulacije fiber elementa i date napomene u vezi s njihovim korišćenjem.",
publisher = "Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije, Beograd",
journal = "Građevinski materijali i konstrukcije",
title = "Fiber element formulation for inelastic frame analysis, Formulacija fiber elementa prilikom nelinearne analize ramova",
pages = "13-3",
number = "2",
volume = "59",
doi = "10.5937/grmk1602003K"
}

Kostić, S. M.,& Deretić-Stojanović, B.. (2016). Fiber element formulation for inelastic frame analysis. in Građevinski materijali i konstrukcije
Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije, Beograd., 59(2), 3-13.
https://doi.org/10.5937/grmk1602003K

Kostić SM, Deretić-Stojanović B. Fiber element formulation for inelastic frame analysis. in Građevinski materijali i konstrukcije. 2016;59(2):3-13.
doi:10.5937/grmk1602003K .

Kostić, Svetlana M., Deretić-Stojanović, Biljana, "Fiber element formulation for inelastic frame analysis" in Građevinski materijali i konstrukcije, 59, no. 2 (2016):3-13,
https://doi.org/10.5937/grmk1602003K . .

TY  - JOUR
AU  - Kostić, Svetlana M.
AU  - Filippou, Filip C.
AU  - Deretić-Stojanović, Biljana
PY  - 2016
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/772
AB  - This paper presents a nonlinear 3d concentrated plasticity beam column element for the analysis of RCFT columns. The element consists of a linear elastic component with a plastic hinge at each end whose inelastic response is described by extending the concept of generalized plasticity to stress resultants. With independent yield and limit surfaces it is possible to describe the gradual yielding of composite sections and their post-yield hardening behavior. The geometric nonlinearity under large displacements is accounted for with the corotational formulation. The paper discusses the calibration of the model parameters and assesses the accuracy of the model through correlation studies.
PB  - Elsevier Ltd
T2  - Computers & Structures
T1  - Generalized plasticity model for inelastic RCFT column response
EP  - 67
SP  - 56
VL  - 168
DO  - 10.1016/j.compstruc.2016.02.006
ER  - 

@article{
author = "Kostić, Svetlana M. and Filippou, Filip C. and Deretić-Stojanović, Biljana",
year = "2016",
abstract = "This paper presents a nonlinear 3d concentrated plasticity beam column element for the analysis of RCFT columns. The element consists of a linear elastic component with a plastic hinge at each end whose inelastic response is described by extending the concept of generalized plasticity to stress resultants. With independent yield and limit surfaces it is possible to describe the gradual yielding of composite sections and their post-yield hardening behavior. The geometric nonlinearity under large displacements is accounted for with the corotational formulation. The paper discusses the calibration of the model parameters and assesses the accuracy of the model through correlation studies.",
publisher = "Elsevier Ltd",
journal = "Computers & Structures",
title = "Generalized plasticity model for inelastic RCFT column response",
pages = "67-56",
volume = "168",
doi = "10.1016/j.compstruc.2016.02.006"
}

Kostić, S. M., Filippou, F. C.,& Deretić-Stojanović, B.. (2016). Generalized plasticity model for inelastic RCFT column response. in Computers & Structures
Elsevier Ltd., 168, 56-67.
https://doi.org/10.1016/j.compstruc.2016.02.006

Kostić SM, Filippou FC, Deretić-Stojanović B. Generalized plasticity model for inelastic RCFT column response. in Computers & Structures. 2016;168:56-67.
doi:10.1016/j.compstruc.2016.02.006 .

Kostić, Svetlana M., Filippou, Filip C., Deretić-Stojanović, Biljana, "Generalized plasticity model for inelastic RCFT column response" in Computers & Structures, 168 (2016):56-67,
https://doi.org/10.1016/j.compstruc.2016.02.006 . .

TY  - CONF
AU  - Lazović Radovanović, Marija
AU  - Deretić-Stojanović, Biljana
AU  - Radovanović, Janko
PY  - 2015
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1295
PB  - Serbian Society of Mecahnics ; Faculty of Technical Sciences, Belgrade ; Novi Sad
C3  - Proceedings / The 5th International Congress of Serbian Society of Mechanics, Arandjelovac, June 15-17, 2015
T1  - Stability of double elastically wedged CFT columns
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1295
ER  - 

@conference{
author = "Lazović Radovanović, Marija and Deretić-Stojanović, Biljana and Radovanović, Janko",
year = "2015",
publisher = "Serbian Society of Mecahnics ; Faculty of Technical Sciences, Belgrade ; Novi Sad",
journal = "Proceedings / The 5th International Congress of Serbian Society of Mechanics, Arandjelovac, June 15-17, 2015",
title = "Stability of double elastically wedged CFT columns",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1295"
}

Lazović Radovanović, M., Deretić-Stojanović, B.,& Radovanović, J.. (2015). Stability of double elastically wedged CFT columns. in Proceedings / The 5th International Congress of Serbian Society of Mechanics, Arandjelovac, June 15-17, 2015
Serbian Society of Mecahnics ; Faculty of Technical Sciences, Belgrade ; Novi Sad..
https://hdl.handle.net/21.15107/rcub_grafar_1295

Lazović Radovanović M, Deretić-Stojanović B, Radovanović J. Stability of double elastically wedged CFT columns. in Proceedings / The 5th International Congress of Serbian Society of Mechanics, Arandjelovac, June 15-17, 2015. 2015;.
https://hdl.handle.net/21.15107/rcub_grafar_1295 .

Lazović Radovanović, Marija, Deretić-Stojanović, Biljana, Radovanović, Janko, "Stability of double elastically wedged CFT columns" in Proceedings / The 5th International Congress of Serbian Society of Mechanics, Arandjelovac, June 15-17, 2015 (2015),
https://hdl.handle.net/21.15107/rcub_grafar_1295 .

TY  - JOUR
AU  - Lazović Radovanović, Marija
AU  - Deretić-Stojanović, Biljana
PY  - 2015
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/674
AB  - This paper analyzes the axial load capacity of CFT columns according to the following standards and codes: EC 4, ACI, AS, AISC, AIJ, DL/T. The influence of the confinement concrete core by steel tube, ratio d/t i e/d, shrinkage and creep of concrete, local buckling, bond of steel tube and concrete core on the bearing capacity of composite section is considered. Diagrams of stress-strain for concrete and steel are shown, which are most commonly used in the literature for modeling CFT columns using finite element method. The influence of slenderness of the column, as one of the key factors to define the fracture of the girder. The numerical example was performed comparing the axial load capacity of circular CFT column to the aforementioned regulations and the values obtained are compared with experimental results available in the literature. Also, in case 2 the capacity calculation of slender column according to EC4 is shown, which is based on the effects of second-order and determining the interaction curve. In the attachment are given the coordinates of the characteristic points for constructing interaction curves for CFT columns of circular and rectangular cross-section.
AB  - U radu je analizirana aksijalna nosivost CFT stubova prema sledećim standardima i kodovima: EC 4, ACI, AS, AISC, AIJ, DL/T. Razmatran je uticaj utezanja betona čeličnom cevi, odnosa d/t i e/d, skupljanja i tečenja betona, lokalnog izvijanja,veze čelične cevi i betonskog jezgra na nosivost spregnutog preseka. Prikazani su dijagrami veze napon-dilatacija za beton i čelik koji se u literaturi najčešće primenjuju za modeliranje CFT stubova primenom metode konačnih elemenata. Razmatran je uticaj vitkosti stuba, kao jedan od ključnih faktora za definisanje načina loma nosača. Na konkretnom brojnom primeru izvršeno je upoređivanje aksijalne nosivosti kružnog CFT stuba prema pomenutim pravilnicima i dobijene vrednosti upoređene su sa rezultatima eksperimenata dostupnih u literaturi. Takođe, u primeru 2 prikazan je proračun nosivosti vitkog stuba prema EC4 koji se zasniva na uticajima drugog reda i određivanju krive interakcije.U prilogu su date koordinate karakterističnih tačaka za crtanje krivih interakcije CFT stubova kružnog i pravougaonog poprečnog preseka.
PB  - Udruženje inženjera građevinarstva, geotehnike, arhitekture i urbanista "Izgradnja", Beograd
T2  - Izgradnja
T1  - Axially capacity of the CFT columns
T1  - Aksijalna nosivost CFT stubova
EP  - 41
IS  - 1-2
SP  - 29
VL  - 69
UR  - https://hdl.handle.net/21.15107/rcub_grafar_674
ER  - 

@article{
author = "Lazović Radovanović, Marija and Deretić-Stojanović, Biljana",
year = "2015",
abstract = "This paper analyzes the axial load capacity of CFT columns according to the following standards and codes: EC 4, ACI, AS, AISC, AIJ, DL/T. The influence of the confinement concrete core by steel tube, ratio d/t i e/d, shrinkage and creep of concrete, local buckling, bond of steel tube and concrete core on the bearing capacity of composite section is considered. Diagrams of stress-strain for concrete and steel are shown, which are most commonly used in the literature for modeling CFT columns using finite element method. The influence of slenderness of the column, as one of the key factors to define the fracture of the girder. The numerical example was performed comparing the axial load capacity of circular CFT column to the aforementioned regulations and the values obtained are compared with experimental results available in the literature. Also, in case 2 the capacity calculation of slender column according to EC4 is shown, which is based on the effects of second-order and determining the interaction curve. In the attachment are given the coordinates of the characteristic points for constructing interaction curves for CFT columns of circular and rectangular cross-section., U radu je analizirana aksijalna nosivost CFT stubova prema sledećim standardima i kodovima: EC 4, ACI, AS, AISC, AIJ, DL/T. Razmatran je uticaj utezanja betona čeličnom cevi, odnosa d/t i e/d, skupljanja i tečenja betona, lokalnog izvijanja,veze čelične cevi i betonskog jezgra na nosivost spregnutog preseka. Prikazani su dijagrami veze napon-dilatacija za beton i čelik koji se u literaturi najčešće primenjuju za modeliranje CFT stubova primenom metode konačnih elemenata. Razmatran je uticaj vitkosti stuba, kao jedan od ključnih faktora za definisanje načina loma nosača. Na konkretnom brojnom primeru izvršeno je upoređivanje aksijalne nosivosti kružnog CFT stuba prema pomenutim pravilnicima i dobijene vrednosti upoređene su sa rezultatima eksperimenata dostupnih u literaturi. Takođe, u primeru 2 prikazan je proračun nosivosti vitkog stuba prema EC4 koji se zasniva na uticajima drugog reda i određivanju krive interakcije.U prilogu su date koordinate karakterističnih tačaka za crtanje krivih interakcije CFT stubova kružnog i pravougaonog poprečnog preseka.",
publisher = "Udruženje inženjera građevinarstva, geotehnike, arhitekture i urbanista "Izgradnja", Beograd",
journal = "Izgradnja",
title = "Axially capacity of the CFT columns, Aksijalna nosivost CFT stubova",
pages = "41-29",
number = "1-2",
volume = "69",
url = "https://hdl.handle.net/21.15107/rcub_grafar_674"
}

Lazović Radovanović, M.,& Deretić-Stojanović, B.. (2015). Axially capacity of the CFT columns. in Izgradnja
Udruženje inženjera građevinarstva, geotehnike, arhitekture i urbanista "Izgradnja", Beograd., 69(1-2), 29-41.
https://hdl.handle.net/21.15107/rcub_grafar_674

Lazović Radovanović M, Deretić-Stojanović B. Axially capacity of the CFT columns. in Izgradnja. 2015;69(1-2):29-41.
https://hdl.handle.net/21.15107/rcub_grafar_674 .

Lazović Radovanović, Marija, Deretić-Stojanović, Biljana, "Axially capacity of the CFT columns" in Izgradnja, 69, no. 1-2 (2015):29-41,
https://hdl.handle.net/21.15107/rcub_grafar_674 .

TY  - JOUR
AU  - Deretić-Stojanović, Biljana
AU  - Kostić, Svetlana M.
PY  - 2015
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/719
AB  - In the paper, the analysis of composite and prestressed beams using the matrix stiffness method is presented. The stiffness matrix for the frame element with a moment release at one end and the vector of equivalent nodal forces for the frame element with and without a moment release are derived. In the presented method, concrete is assumed to behave as viscoelastic material and the relaxation of the prestressing steel is also considered. Therefore, the relations between the generalized element displacements and the generalized element forces are integral and, here, are presented using the mathematical operators. Applying the linear integral operators, the solution to the problem is derived without introducing additional mathematical approximations and simplifications, besides the inevitable approximations related to the rheological properties of constitute materials, i.e., steel, concrete, prestressing and reinforcement steel. The derived relations can be applied with any concrete creep functions and for the element with a variable cross section.
PB  - Springer Verlag
T2  - Archive of Applied Mechanics
T1  - Matrix Stiffness Method for Composite and Prestressed Beam Analysis Using Linear Integral Operators
EP  - 1981
IS  - 12
SP  - 1961
VL  - 85
DO  - 10.1007/s00419-015-1030-7
ER  - 

@article{
author = "Deretić-Stojanović, Biljana and Kostić, Svetlana M.",
year = "2015",
abstract = "In the paper, the analysis of composite and prestressed beams using the matrix stiffness method is presented. The stiffness matrix for the frame element with a moment release at one end and the vector of equivalent nodal forces for the frame element with and without a moment release are derived. In the presented method, concrete is assumed to behave as viscoelastic material and the relaxation of the prestressing steel is also considered. Therefore, the relations between the generalized element displacements and the generalized element forces are integral and, here, are presented using the mathematical operators. Applying the linear integral operators, the solution to the problem is derived without introducing additional mathematical approximations and simplifications, besides the inevitable approximations related to the rheological properties of constitute materials, i.e., steel, concrete, prestressing and reinforcement steel. The derived relations can be applied with any concrete creep functions and for the element with a variable cross section.",
publisher = "Springer Verlag",
journal = "Archive of Applied Mechanics",
title = "Matrix Stiffness Method for Composite and Prestressed Beam Analysis Using Linear Integral Operators",
pages = "1981-1961",
number = "12",
volume = "85",
doi = "10.1007/s00419-015-1030-7"
}

Deretić-Stojanović, B.,& Kostić, S. M.. (2015). Matrix Stiffness Method for Composite and Prestressed Beam Analysis Using Linear Integral Operators. in Archive of Applied Mechanics
Springer Verlag., 85(12), 1961-1981.
https://doi.org/10.1007/s00419-015-1030-7

Deretić-Stojanović B, Kostić SM. Matrix Stiffness Method for Composite and Prestressed Beam Analysis Using Linear Integral Operators. in Archive of Applied Mechanics. 2015;85(12):1961-1981.
doi:10.1007/s00419-015-1030-7 .

Deretić-Stojanović, Biljana, Kostić, Svetlana M., "Matrix Stiffness Method for Composite and Prestressed Beam Analysis Using Linear Integral Operators" in Archive of Applied Mechanics, 85, no. 12 (2015):1961-1981,
https://doi.org/10.1007/s00419-015-1030-7 . .

TY  - JOUR
AU  - Deretić-Stojanović, Biljana
AU  - Kostić, Svetlana M.
PY  - 2015
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/663
AB  - The paper presents the viscoelastic analysis of composite and prestressed beams using the slope deflection method. For the fixed-end frame element, considering the viscoelastic behavior of concrete and relaxation of prestressing steel, the integral relation between the generalized element forces and the generalized element displacements, i.e., the element stiffness matrix, is derived and presented using the mathematical operators. From the element and system equilibrium equations, the integral equations of the problem with unknown displacements are formulated. Comparing to the analysis of homogeneous elastic structures, the governing equations of the problem are similar, but with integral equations instead of algebraic equations. In the presented method, the solution to the problem is derived using the linear integral operators without introducing any additional mathematical approximations, apart from the adopted rheological relations for constitute materials. In addition, the obtained expressions are general in a sense that any concrete creep functions can be used and the element can be with a variable cross section.
PB  - Springer Verlag
T2  - Archive of Applied Mechanics
T1  - Time-dependent analysis of composite and prestressed beams using the slope deflection method
EP  - 272
IS  - 2
SP  - 257
VL  - 85
DO  - 10.1007/s00419-014-0917-z
ER  - 

@article{
author = "Deretić-Stojanović, Biljana and Kostić, Svetlana M.",
year = "2015",
abstract = "The paper presents the viscoelastic analysis of composite and prestressed beams using the slope deflection method. For the fixed-end frame element, considering the viscoelastic behavior of concrete and relaxation of prestressing steel, the integral relation between the generalized element forces and the generalized element displacements, i.e., the element stiffness matrix, is derived and presented using the mathematical operators. From the element and system equilibrium equations, the integral equations of the problem with unknown displacements are formulated. Comparing to the analysis of homogeneous elastic structures, the governing equations of the problem are similar, but with integral equations instead of algebraic equations. In the presented method, the solution to the problem is derived using the linear integral operators without introducing any additional mathematical approximations, apart from the adopted rheological relations for constitute materials. In addition, the obtained expressions are general in a sense that any concrete creep functions can be used and the element can be with a variable cross section.",
publisher = "Springer Verlag",
journal = "Archive of Applied Mechanics",
title = "Time-dependent analysis of composite and prestressed beams using the slope deflection method",
pages = "272-257",
number = "2",
volume = "85",
doi = "10.1007/s00419-014-0917-z"
}

Deretić-Stojanović, B.,& Kostić, S. M.. (2015). Time-dependent analysis of composite and prestressed beams using the slope deflection method. in Archive of Applied Mechanics
Springer Verlag., 85(2), 257-272.
https://doi.org/10.1007/s00419-014-0917-z

Deretić-Stojanović B, Kostić SM. Time-dependent analysis of composite and prestressed beams using the slope deflection method. in Archive of Applied Mechanics. 2015;85(2):257-272.
doi:10.1007/s00419-014-0917-z .

Deretić-Stojanović, Biljana, Kostić, Svetlana M., "Time-dependent analysis of composite and prestressed beams using the slope deflection method" in Archive of Applied Mechanics, 85, no. 2 (2015):257-272,
https://doi.org/10.1007/s00419-014-0917-z . .

TY  - CONF
AU  - Deretić-Stojanović, Biljana
AU  - Kostić, Svetlana M.
AU  - Lazović Radovanović, Marija
PY  - 2014
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1169
AB  - Bending resistance of a composite steel and concrete section apart from shape and dimensions of a cross section and mechanical characteristics of materials, depends also on type of shear connection, i.e. connectors and shear steel-concrete interface. In the paper, ductile and nonductile headed studs are considered. Bending resistance of composite sections with partial shear connection, which is a connection where a number of shear studs is smaller than necessary for fully plastic bending resistance of a section to be achieved, is analysed. The reduced bending resistance is found. The calculaton in accordance with Eurocode 4 is presented.
AB  - Nosivost na savijanje spregnutog preseka od čelika i betona pored oblika i dimenzija poprečnog preseka i mehaničkih karakteristika materijala, zavisi i od načina sprezanja, tj. tipova sredstava za sprezanja i oblikovanja kontaktnog (smičućeg) spoja između betona i čelika. U radu se koriste duktilni i neduktilni moždanici sa glavom. Određuje se nosivost na savijanje spregnutih preseka sa parcijalnim smičućim spojem u kome, za razliku od punog smičućeg spoja, broj moždanika nije dovoljan da se ostvari moment pune nosivosti, tako da se određuje redukovani moment nosivosti. Proračun se sprovodi prema Evrokodu 4.
PB  - Društvo građevinskih konstruktera Srbije, Beograd
C3  - Zbornik radova / DGKS Društvo građevinskih konstruktera Srbije, 14. kongres, Novi Sad, 24-26. oktobar, 2014
T1  - Bending resistance of composite section with partial shear connection according to EC4
T1  - Nosivost na savijanje spregnutog preseka sa parcijalnim smičućim spojem prema EC4
EP  - 224
SP  - 215
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1169
ER  - 

@conference{
author = "Deretić-Stojanović, Biljana and Kostić, Svetlana M. and Lazović Radovanović, Marija",
year = "2014",
abstract = "Bending resistance of a composite steel and concrete section apart from shape and dimensions of a cross section and mechanical characteristics of materials, depends also on type of shear connection, i.e. connectors and shear steel-concrete interface. In the paper, ductile and nonductile headed studs are considered. Bending resistance of composite sections with partial shear connection, which is a connection where a number of shear studs is smaller than necessary for fully plastic bending resistance of a section to be achieved, is analysed. The reduced bending resistance is found. The calculaton in accordance with Eurocode 4 is presented., Nosivost na savijanje spregnutog preseka od čelika i betona pored oblika i dimenzija poprečnog preseka i mehaničkih karakteristika materijala, zavisi i od načina sprezanja, tj. tipova sredstava za sprezanja i oblikovanja kontaktnog (smičućeg) spoja između betona i čelika. U radu se koriste duktilni i neduktilni moždanici sa glavom. Određuje se nosivost na savijanje spregnutih preseka sa parcijalnim smičućim spojem u kome, za razliku od punog smičućeg spoja, broj moždanika nije dovoljan da se ostvari moment pune nosivosti, tako da se određuje redukovani moment nosivosti. Proračun se sprovodi prema Evrokodu 4.",
publisher = "Društvo građevinskih konstruktera Srbije, Beograd",
journal = "Zbornik radova / DGKS Društvo građevinskih konstruktera Srbije, 14. kongres, Novi Sad, 24-26. oktobar, 2014",
title = "Bending resistance of composite section with partial shear connection according to EC4, Nosivost na savijanje spregnutog preseka sa parcijalnim smičućim spojem prema EC4",
pages = "224-215",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1169"
}

Deretić-Stojanović, B., Kostić, S. M.,& Lazović Radovanović, M.. (2014). Bending resistance of composite section with partial shear connection according to EC4. in Zbornik radova / DGKS Društvo građevinskih konstruktera Srbije, 14. kongres, Novi Sad, 24-26. oktobar, 2014
Društvo građevinskih konstruktera Srbije, Beograd., 215-224.
https://hdl.handle.net/21.15107/rcub_grafar_1169

Deretić-Stojanović B, Kostić SM, Lazović Radovanović M. Bending resistance of composite section with partial shear connection according to EC4. in Zbornik radova / DGKS Društvo građevinskih konstruktera Srbije, 14. kongres, Novi Sad, 24-26. oktobar, 2014. 2014;:215-224.
https://hdl.handle.net/21.15107/rcub_grafar_1169 .

Deretić-Stojanović, Biljana, Kostić, Svetlana M., Lazović Radovanović, Marija, "Bending resistance of composite section with partial shear connection according to EC4" in Zbornik radova / DGKS Društvo građevinskih konstruktera Srbije, 14. kongres, Novi Sad, 24-26. oktobar, 2014 (2014):215-224,
https://hdl.handle.net/21.15107/rcub_grafar_1169 .

TY  - CONF
AU  - Kostić, Svetlana M.
AU  - Lazović Radovanović, Marija
AU  - Deretić-Stojanović, Biljana
AU  - Stošić, Saša
PY  - 2014
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1146
AB  - In the paper, a simplified method for design of circular composite CFT columns according to the European standard for deisgn of composite steel and concrete structures – Eurocode 4 is presented. Veri¬fication of the column section capacity under axial compression and bending is based on the concept of limit states and determination of the N-M interaction curve. For eight the most common in practice CFT columns, continuous N-M interaction curves are constructed. In addition, for these selected sections, the influence of the variation of the concrete and steel classes on the column cross-section capacity is analyzed. Given interaction curves simplify the design of composite columns and the choice of dimensions of CFT column and its steel and concrete classes.
PB  - Građevinski fakultet, Subotica
C3  - Međunarodna konferencija Savremena dostignuća u građevinarstvu 25
T1  - Parametric Study of Circular CFT Column Capacity According to Eurocode 4
T1  - Parametarska analiza nosivosti kružnih CFT stubova prema Evrokodu 4
EP  - 364
SP  - 359
VL  - 30
DO  - 10.14415/konferencijaGFS2014.048
ER  - 

@conference{
author = "Kostić, Svetlana M. and Lazović Radovanović, Marija and Deretić-Stojanović, Biljana and Stošić, Saša",
year = "2014",
abstract = "In the paper, a simplified method for design of circular composite CFT columns according to the European standard for deisgn of composite steel and concrete structures – Eurocode 4 is presented. Veri¬fication of the column section capacity under axial compression and bending is based on the concept of limit states and determination of the N-M interaction curve. For eight the most common in practice CFT columns, continuous N-M interaction curves are constructed. In addition, for these selected sections, the influence of the variation of the concrete and steel classes on the column cross-section capacity is analyzed. Given interaction curves simplify the design of composite columns and the choice of dimensions of CFT column and its steel and concrete classes.",
publisher = "Građevinski fakultet, Subotica",
journal = "Međunarodna konferencija Savremena dostignuća u građevinarstvu 25",
title = "Parametric Study of Circular CFT Column Capacity According to Eurocode 4, Parametarska analiza nosivosti kružnih CFT stubova prema Evrokodu 4",
pages = "364-359",
volume = "30",
doi = "10.14415/konferencijaGFS2014.048"
}

Kostić, S. M., Lazović Radovanović, M., Deretić-Stojanović, B.,& Stošić, S.. (2014). Parametric Study of Circular CFT Column Capacity According to Eurocode 4. in Međunarodna konferencija Savremena dostignuća u građevinarstvu 25
Građevinski fakultet, Subotica., 30, 359-364.
https://doi.org/10.14415/konferencijaGFS2014.048

Kostić SM, Lazović Radovanović M, Deretić-Stojanović B, Stošić S. Parametric Study of Circular CFT Column Capacity According to Eurocode 4. in Međunarodna konferencija Savremena dostignuća u građevinarstvu 25. 2014;30:359-364.
doi:10.14415/konferencijaGFS2014.048 .

Kostić, Svetlana M., Lazović Radovanović, Marija, Deretić-Stojanović, Biljana, Stošić, Saša, "Parametric Study of Circular CFT Column Capacity According to Eurocode 4" in Međunarodna konferencija Savremena dostignuća u građevinarstvu 25, 30 (2014):359-364,
https://doi.org/10.14415/konferencijaGFS2014.048 . .

TY  - JOUR
AU  - Lazović Radovanović, Marija
AU  - Deretić-Stojanović, Biljana
AU  - Kostić, Svetlana M.
AU  - Stošić, Saša
PY  - 2013
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/483
AB  - This paper presents a simplified method for calculation of bearing capacity of composite columns according to the European standard for the calculation of composite steel and concrete structures - Eurocode 4. Resistance analysis, and also the stability analysis of the isolated column under axial compression is based on the application of the European buckling curves. Verification of the column capacity subjected to axial compression and bending is based on the N-M interaction curve. For the presented numerical example, construction of the interaction curve is explained for the composite column with the circular concrete filled steel tube cross section. The influence of the concrete core confinement on the increase of concrete strength and the column bearing capacity of a CFT column is discussed. The [N, M] coordinates of the continuous interaction curve are calculated from the derived expressions for determination of the area and the static moment of the cut-off portion of the circular CFT section. For the presented example, the effects of the strength of concrete, strength of steel and the diameter and wall thickness of the steel tube on the composite CFT cross section capacity is discussed.
AB  - U radu je prikazana uprošćena metoda proračuna nosivosti spregnutih stubova prema važećem evropskom standardu za proračun spregnutih konstrukcija od čelika i betona - Evrokodu 4. Analiza nosivosti, a time i stabilnosti pri aksijalnom pritisku izolovanog stuba bazira se na primeni evropskih krivih izvijanja. Provera nosivosti pri kombinaciji aksijalnog pritiska i momenta savijanja zasniva se na N-M interakcionoj krivoj. Na konkretnom brojnom primeru prikazano je konstruisanje krive interakcije za spregnuti stub poprečnog preseka u obliku kružnog šupljeg profila ispunjenog betonom. Razmatran je uticaj utezanja betona na povećanje čvrstoće betona i nosivosti preseka CFT stuba. Izvođenjem izraza za određivanje odsečenih površina i statičkih momenata odsečenih površina kod kružnog CFT stuba, a zatim i određivanjem koordinata tačaka koje pripadaju krivoj interakcije, konstruisana je kontinualana kriva interakcije. Za navedeni poprečni presek kod proračuna nosivosti pri kombinaciji aksijalnog pritiska i savijanja, analizirani su sledeći uticaji na graničnu nosivost spregnutog preseka: uticaj promene marke betona, uticaj promene klase čelika i uticaj promene odnosa prečnika i debljine čeličnog profila.
PB  - Udruženje inženjera građevinarstva, geotehnike, arhitekture i urbanista "Izgradnja", Beograd
T2  - Izgradnja
T1  - Design of circular composite CFT columns according to Eurocode 4
T1  - Analiza nosivosti kružnih CFT stubova prema Evrokodu 4
EP  - 460
IS  - 11-12
SP  - 455
VL  - 67
UR  - https://hdl.handle.net/21.15107/rcub_grafar_483
ER  - 

@article{
author = "Lazović Radovanović, Marija and Deretić-Stojanović, Biljana and Kostić, Svetlana M. and Stošić, Saša",
year = "2013",
abstract = "This paper presents a simplified method for calculation of bearing capacity of composite columns according to the European standard for the calculation of composite steel and concrete structures - Eurocode 4. Resistance analysis, and also the stability analysis of the isolated column under axial compression is based on the application of the European buckling curves. Verification of the column capacity subjected to axial compression and bending is based on the N-M interaction curve. For the presented numerical example, construction of the interaction curve is explained for the composite column with the circular concrete filled steel tube cross section. The influence of the concrete core confinement on the increase of concrete strength and the column bearing capacity of a CFT column is discussed. The [N, M] coordinates of the continuous interaction curve are calculated from the derived expressions for determination of the area and the static moment of the cut-off portion of the circular CFT section. For the presented example, the effects of the strength of concrete, strength of steel and the diameter and wall thickness of the steel tube on the composite CFT cross section capacity is discussed., U radu je prikazana uprošćena metoda proračuna nosivosti spregnutih stubova prema važećem evropskom standardu za proračun spregnutih konstrukcija od čelika i betona - Evrokodu 4. Analiza nosivosti, a time i stabilnosti pri aksijalnom pritisku izolovanog stuba bazira se na primeni evropskih krivih izvijanja. Provera nosivosti pri kombinaciji aksijalnog pritiska i momenta savijanja zasniva se na N-M interakcionoj krivoj. Na konkretnom brojnom primeru prikazano je konstruisanje krive interakcije za spregnuti stub poprečnog preseka u obliku kružnog šupljeg profila ispunjenog betonom. Razmatran je uticaj utezanja betona na povećanje čvrstoće betona i nosivosti preseka CFT stuba. Izvođenjem izraza za određivanje odsečenih površina i statičkih momenata odsečenih površina kod kružnog CFT stuba, a zatim i određivanjem koordinata tačaka koje pripadaju krivoj interakcije, konstruisana je kontinualana kriva interakcije. Za navedeni poprečni presek kod proračuna nosivosti pri kombinaciji aksijalnog pritiska i savijanja, analizirani su sledeći uticaji na graničnu nosivost spregnutog preseka: uticaj promene marke betona, uticaj promene klase čelika i uticaj promene odnosa prečnika i debljine čeličnog profila.",
publisher = "Udruženje inženjera građevinarstva, geotehnike, arhitekture i urbanista "Izgradnja", Beograd",
journal = "Izgradnja",
title = "Design of circular composite CFT columns according to Eurocode 4, Analiza nosivosti kružnih CFT stubova prema Evrokodu 4",
pages = "460-455",
number = "11-12",
volume = "67",
url = "https://hdl.handle.net/21.15107/rcub_grafar_483"
}

Lazović Radovanović, M., Deretić-Stojanović, B., Kostić, S. M.,& Stošić, S.. (2013). Design of circular composite CFT columns according to Eurocode 4. in Izgradnja
Udruženje inženjera građevinarstva, geotehnike, arhitekture i urbanista "Izgradnja", Beograd., 67(11-12), 455-460.
https://hdl.handle.net/21.15107/rcub_grafar_483

Lazović Radovanović M, Deretić-Stojanović B, Kostić SM, Stošić S. Design of circular composite CFT columns according to Eurocode 4. in Izgradnja. 2013;67(11-12):455-460.
https://hdl.handle.net/21.15107/rcub_grafar_483 .

Lazović Radovanović, Marija, Deretić-Stojanović, Biljana, Kostić, Svetlana M., Stošić, Saša, "Design of circular composite CFT columns according to Eurocode 4" in Izgradnja, 67, no. 11-12 (2013):455-460,
https://hdl.handle.net/21.15107/rcub_grafar_483 .

TY  - CONF
AU  - Kostić, Svetlana M.
AU  - Filippou, Filip C.
AU  - Deretić-Stojanović, Biljana
PY  - 2013
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/548
AB  - In the paper, an efficient three-dimensional concentrated plasticity nonlinear beam-column element is used for the simulation of the response of square CFT columns. The element adopts the concept of the generalized plasticity material model for the section resultant - element deformation relation and has plastic hinges located at the ends of the element and described with yield and limit surfaces. Determination of the adequate element parameters which are essential for a successful description of the CFT member behavior is discussed. Among these parameters, most important are the stiffness and yield surface parameters.
PB  - National Technical University of Athens
C3  - ECCOMAS Thematic Conference - COMPDYN 2013: 4th International Conference on Computational Methods in
T1  - Applcation of generalized plasticity model in square CFT column analysis
EP  - 3535
SP  - 3523
UR  - https://hdl.handle.net/21.15107/rcub_grafar_548
ER  - 

@conference{
author = "Kostić, Svetlana M. and Filippou, Filip C. and Deretić-Stojanović, Biljana",
year = "2013",
abstract = "In the paper, an efficient three-dimensional concentrated plasticity nonlinear beam-column element is used for the simulation of the response of square CFT columns. The element adopts the concept of the generalized plasticity material model for the section resultant - element deformation relation and has plastic hinges located at the ends of the element and described with yield and limit surfaces. Determination of the adequate element parameters which are essential for a successful description of the CFT member behavior is discussed. Among these parameters, most important are the stiffness and yield surface parameters.",
publisher = "National Technical University of Athens",
journal = "ECCOMAS Thematic Conference - COMPDYN 2013: 4th International Conference on Computational Methods in",
title = "Applcation of generalized plasticity model in square CFT column analysis",
pages = "3535-3523",
url = "https://hdl.handle.net/21.15107/rcub_grafar_548"
}

Kostić, S. M., Filippou, F. C.,& Deretić-Stojanović, B.. (2013). Applcation of generalized plasticity model in square CFT column analysis. in ECCOMAS Thematic Conference - COMPDYN 2013: 4th International Conference on Computational Methods in
National Technical University of Athens., 3523-3535.
https://hdl.handle.net/21.15107/rcub_grafar_548

Kostić SM, Filippou FC, Deretić-Stojanović B. Applcation of generalized plasticity model in square CFT column analysis. in ECCOMAS Thematic Conference - COMPDYN 2013: 4th International Conference on Computational Methods in. 2013;:3523-3535.
https://hdl.handle.net/21.15107/rcub_grafar_548 .

Kostić, Svetlana M., Filippou, Filip C., Deretić-Stojanović, Biljana, "Applcation of generalized plasticity model in square CFT column analysis" in ECCOMAS Thematic Conference - COMPDYN 2013: 4th International Conference on Computational Methods in (2013):3523-3535,
https://hdl.handle.net/21.15107/rcub_grafar_548 .

TY  - JOUR
AU  - Kostić, Svetlana M.
AU  - Stošić, Saša
AU  - Deretić-Stojanović, Biljana
PY  - 2011
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/355
AB  - In the paper, design of composite steel-concrete column according to Eurocode 4 is illustrated on detailed numerical example. The theoretical foundations of the Eurocode 4 design procedure is explained before, in the paper of the same group of authors. The resistance of a composite column subjected to axial compression and biaxial bending is determined. Capacity and stability analysis of the individual composite column under axial compression is based on the use of European buckling curves. The verification of column bearing capacity is based on use of interaction diagram determined from capacity analysis of composite cross-section. Second order effects and effects of creep and shrinkage of concrete are taken into account. For the cross section of fully encased column with I steel section, the dependency of concrete class and reinforcement ratio on ultimate cross section capacity is studied. For this type of composite cross section and 6 different steel sections, the continuous interaction curves are constructed, for common concrete classes. These curves are very practical since simplify the design of composite columns and choice of dimensions of concrete section, steel section and concrete class.
AB  - U radu se, na detaljnom brojnom primeru spregnutog stuba kod koga je čelični I profil potpuno obložen betonom, ilustruje proračun nosivosti spregnutih stubova prema važećem evropskom standardu za proračun spregnutih konstrukcija od čelika i betona - Evrokodu 4 koji je detaljno objašnjen u prethodnom radu iste grupe autora. Određena je nosivost spregnutog stuba izloženog samo aksijalnom pritisku i izloženog istovremenom uticaju aksijalnog pritiska i savijanja momentima. Analiza nosivosti, a time i stabilnosti pri aksijalnom pritisku izolovanog stuba bazira se na primeni Evropskih krivih izvijanja. Provera nosivosti pri kombinaciji aksijalnog pritiska i savijanja momentima zasniva se na interakcionoj krivoj koja se određuje pri analizi nosivosti poprečnog preseka posmatranog stuba. Uzeti su u obzir uticaji drugog reda kao i uticaji skupljanja i tečenja betona. Za poprečni presek spregnutog stuba kod koga je čelični I profil potpuno obložen betonom, prikazan je uticaj marke betona i procenta armiranja na graničnu nosivost poprečnog preseka. Za dati tip spregnutog poprečnog preseka i nekoliko valjanih čeličnih profila, konstruisane su kontinualne krive interakcije za uobičajene klase betona. Ove krive su vrlo pogodne za praktičnu primenu i olakšavaju dimenzionisanje spregnutih stubova, budući da pojednostavljuju izbor dimenzija betonskog dela preseka, čeličnog profila i klase betona.
PB  - Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije, Beograd
T2  - Materijali i konstrukcije
T1  - Contribution to analysis of composite steel and concrete columns
T1  - Prilog proračunu spregnutih stubova od čelika i betona
EP  - 16
IS  - 2
SP  - 3
VL  - 54
UR  - https://hdl.handle.net/21.15107/rcub_grafar_355
ER  - 

@article{
author = "Kostić, Svetlana M. and Stošić, Saša and Deretić-Stojanović, Biljana",
year = "2011",
abstract = "In the paper, design of composite steel-concrete column according to Eurocode 4 is illustrated on detailed numerical example. The theoretical foundations of the Eurocode 4 design procedure is explained before, in the paper of the same group of authors. The resistance of a composite column subjected to axial compression and biaxial bending is determined. Capacity and stability analysis of the individual composite column under axial compression is based on the use of European buckling curves. The verification of column bearing capacity is based on use of interaction diagram determined from capacity analysis of composite cross-section. Second order effects and effects of creep and shrinkage of concrete are taken into account. For the cross section of fully encased column with I steel section, the dependency of concrete class and reinforcement ratio on ultimate cross section capacity is studied. For this type of composite cross section and 6 different steel sections, the continuous interaction curves are constructed, for common concrete classes. These curves are very practical since simplify the design of composite columns and choice of dimensions of concrete section, steel section and concrete class., U radu se, na detaljnom brojnom primeru spregnutog stuba kod koga je čelični I profil potpuno obložen betonom, ilustruje proračun nosivosti spregnutih stubova prema važećem evropskom standardu za proračun spregnutih konstrukcija od čelika i betona - Evrokodu 4 koji je detaljno objašnjen u prethodnom radu iste grupe autora. Određena je nosivost spregnutog stuba izloženog samo aksijalnom pritisku i izloženog istovremenom uticaju aksijalnog pritiska i savijanja momentima. Analiza nosivosti, a time i stabilnosti pri aksijalnom pritisku izolovanog stuba bazira se na primeni Evropskih krivih izvijanja. Provera nosivosti pri kombinaciji aksijalnog pritiska i savijanja momentima zasniva se na interakcionoj krivoj koja se određuje pri analizi nosivosti poprečnog preseka posmatranog stuba. Uzeti su u obzir uticaji drugog reda kao i uticaji skupljanja i tečenja betona. Za poprečni presek spregnutog stuba kod koga je čelični I profil potpuno obložen betonom, prikazan je uticaj marke betona i procenta armiranja na graničnu nosivost poprečnog preseka. Za dati tip spregnutog poprečnog preseka i nekoliko valjanih čeličnih profila, konstruisane su kontinualne krive interakcije za uobičajene klase betona. Ove krive su vrlo pogodne za praktičnu primenu i olakšavaju dimenzionisanje spregnutih stubova, budući da pojednostavljuju izbor dimenzija betonskog dela preseka, čeličnog profila i klase betona.",
publisher = "Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije, Beograd",
journal = "Materijali i konstrukcije",
title = "Contribution to analysis of composite steel and concrete columns, Prilog proračunu spregnutih stubova od čelika i betona",
pages = "16-3",
number = "2",
volume = "54",
url = "https://hdl.handle.net/21.15107/rcub_grafar_355"
}

Kostić, S. M., Stošić, S.,& Deretić-Stojanović, B.. (2011). Contribution to analysis of composite steel and concrete columns. in Materijali i konstrukcije
Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije, Beograd., 54(2), 3-16.
https://hdl.handle.net/21.15107/rcub_grafar_355

Kostić SM, Stošić S, Deretić-Stojanović B. Contribution to analysis of composite steel and concrete columns. in Materijali i konstrukcije. 2011;54(2):3-16.
https://hdl.handle.net/21.15107/rcub_grafar_355 .

Kostić, Svetlana M., Stošić, Saša, Deretić-Stojanović, Biljana, "Contribution to analysis of composite steel and concrete columns" in Materijali i konstrukcije, 54, no. 2 (2011):3-16,
https://hdl.handle.net/21.15107/rcub_grafar_355 .

TY  - JOUR
AU  - Deretić-Stojanović, Biljana
AU  - Kostić, Svetlana M.
AU  - Stošić, Saša
PY  - 2011
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/342
AB  - The paper deals with the design of composite steelconcrete columns according to Eurocode 4. The simplified design method and limitations for its use are explained in details. A column is analysed as an individual member, subjected to lateral loadings over the column height and axial forces and bending moments at the element ends, determined from global analysis, i.e. from the analysis of the whole structure. The resistance of a composite column subjected to axial compression and biaxial bending is analysed. The verification of bending resistance of a composite steelconcrete column cross section is based on theory of plasticity, while resistance of individual column is based on the theory of elasticity, but include the second-order effects and imperfections. Capacity and stability analysis under axial compression is based on the use of European buckling curves. The verification of column bearing capacity is based on the use of interaction diagram determined from capacity analysis of composite cross-section. Since the Eurocodes are being accepted as our national standards, the main aim of this paper is to simplify the use of this standard in our ordinary engineering practice through the detailed explanations of the design procedure of composite steel-concrete columns.
AB  - U radu se prikazuje proračun nosivosti spregnutih stubova prema važećem evropskom standardu za proračun spregnutih konstrukcija od čelika i betona - Evrokodu 4 (EC4). Daje se detaljni prikaz približne metode proračuna i uslovi za njenu primenu. Stub se posmatra kao izolovani element opterećen mogućim poprečnim opterećenjem i opterećen na krajevima aksijalnom silom pritiska i momentima određenim globalnom analizom tj. analizom konstrukcije kojoj pripada posmatrani stub. Analizira se nosivost spregnutog stuba izloženog samo aksijalnom pritisku i izloženog istovremenom uticaju aksijalnog pritiska i savijanja momentima. Provera nosivosti poprečnog preseka spregnutog stuba vrši se u okviru teorije plastičnosti, a analiza nosivosti izolovanog stuba u okviru teorije elastičnosti, vodeći računa o uticajima drugog reda i imperfekcijama stuba. Analiza nosivosti, a time i stabilnosti, pri aksijalnom pritisku izolovanog stuba bazira se na primeni Evropskih krivih izvijanja. Provera nosivosti pri kombinaciji aksijalnog pritiska i savijanja momentima zasniva se na interakcionom dijagramu koji se određuje pri analizi nosivosti poprečnog preseka posmatranog stuba. Kako je u toku usvajanje Evrokodova za konstrukcije kao naših zvaničnih standarda, cilj ovog rada je da detaljnim prikazom proračuna spregnutih stubova prema Evrokodu 4 olakša primenu ovog standarda u našoj inženjerskoj praksi.
PB  - Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije, Beograd
T2  - Materijali i konstrukcije
T1  - Analysis of composite steel and concrete columns
T1  - Proračun spregnutih stubova od čelika i betona
EP  - 79
IS  - 1
SP  - 62
VL  - 54
UR  - https://hdl.handle.net/21.15107/rcub_grafar_342
ER  - 

@article{
author = "Deretić-Stojanović, Biljana and Kostić, Svetlana M. and Stošić, Saša",
year = "2011",
abstract = "The paper deals with the design of composite steelconcrete columns according to Eurocode 4. The simplified design method and limitations for its use are explained in details. A column is analysed as an individual member, subjected to lateral loadings over the column height and axial forces and bending moments at the element ends, determined from global analysis, i.e. from the analysis of the whole structure. The resistance of a composite column subjected to axial compression and biaxial bending is analysed. The verification of bending resistance of a composite steelconcrete column cross section is based on theory of plasticity, while resistance of individual column is based on the theory of elasticity, but include the second-order effects and imperfections. Capacity and stability analysis under axial compression is based on the use of European buckling curves. The verification of column bearing capacity is based on the use of interaction diagram determined from capacity analysis of composite cross-section. Since the Eurocodes are being accepted as our national standards, the main aim of this paper is to simplify the use of this standard in our ordinary engineering practice through the detailed explanations of the design procedure of composite steel-concrete columns., U radu se prikazuje proračun nosivosti spregnutih stubova prema važećem evropskom standardu za proračun spregnutih konstrukcija od čelika i betona - Evrokodu 4 (EC4). Daje se detaljni prikaz približne metode proračuna i uslovi za njenu primenu. Stub se posmatra kao izolovani element opterećen mogućim poprečnim opterećenjem i opterećen na krajevima aksijalnom silom pritiska i momentima određenim globalnom analizom tj. analizom konstrukcije kojoj pripada posmatrani stub. Analizira se nosivost spregnutog stuba izloženog samo aksijalnom pritisku i izloženog istovremenom uticaju aksijalnog pritiska i savijanja momentima. Provera nosivosti poprečnog preseka spregnutog stuba vrši se u okviru teorije plastičnosti, a analiza nosivosti izolovanog stuba u okviru teorije elastičnosti, vodeći računa o uticajima drugog reda i imperfekcijama stuba. Analiza nosivosti, a time i stabilnosti, pri aksijalnom pritisku izolovanog stuba bazira se na primeni Evropskih krivih izvijanja. Provera nosivosti pri kombinaciji aksijalnog pritiska i savijanja momentima zasniva se na interakcionom dijagramu koji se određuje pri analizi nosivosti poprečnog preseka posmatranog stuba. Kako je u toku usvajanje Evrokodova za konstrukcije kao naših zvaničnih standarda, cilj ovog rada je da detaljnim prikazom proračuna spregnutih stubova prema Evrokodu 4 olakša primenu ovog standarda u našoj inženjerskoj praksi.",
publisher = "Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije, Beograd",
journal = "Materijali i konstrukcije",
title = "Analysis of composite steel and concrete columns, Proračun spregnutih stubova od čelika i betona",
pages = "79-62",
number = "1",
volume = "54",
url = "https://hdl.handle.net/21.15107/rcub_grafar_342"
}

Deretić-Stojanović, B., Kostić, S. M.,& Stošić, S.. (2011). Analysis of composite steel and concrete columns. in Materijali i konstrukcije
Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije, Beograd., 54(1), 62-79.
https://hdl.handle.net/21.15107/rcub_grafar_342

Deretić-Stojanović B, Kostić SM, Stošić S. Analysis of composite steel and concrete columns. in Materijali i konstrukcije. 2011;54(1):62-79.
https://hdl.handle.net/21.15107/rcub_grafar_342 .

Deretić-Stojanović, Biljana, Kostić, Svetlana M., Stošić, Saša, "Analysis of composite steel and concrete columns" in Materijali i konstrukcije, 54, no. 1 (2011):62-79,
https://hdl.handle.net/21.15107/rcub_grafar_342 .

TY  - JOUR
AU  - Kostić, Svetlana M.
AU  - Deretić-Stojanović, Biljana
AU  - Stošić, Saša
PY  - 2011
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/417
AB  - Different analytical methods, with different levels of approximations and accuracy, are available for analysis of continuous composite steel-concrete beams. The Eurocode 4 recommends few simple methods for calculation of creep, shrinkage, cracking of concrete and shear lag effects that are explained in the paper. Through the numerical examples of four continuous composite steel-concrete beams, the proposed methods of analyses are evaluated and compared. Practical recommendations for analysis of this type of girders are formulated.
AB  - Za analizu spregnutih kontinualnih nosača od čelika i betona postoje različite analitičke metode, različitog stepena tačnosti. Evrokod 4 dozvoljava i preporučuje nekoliko jednostavnih metoda kojima se u proračun uvode nelinearni efekti kao što su skupljanje i tečenje betona, ispicalost betonske ploče i shear-lag efekat, i one su objašnjene u radu. Kroz numeričku analizu četiri spregnuta kontinualna nosača ove metode su upoređene i date su praktične preporuke za analizu ove grupe nosača.
PB  - Univerzitet u Nišu, Niš
T2  - Facta universitatis - series: Architecture and Civil Engineering
T1  - Redistribution effects in linear elastic analyses of continuous composite steel-concrete beams according to Eurocode 4
T1  - Redistribucija uticaja u linearno elastičnoj analizi spregnutih kontinualnih nosača od čelika i betona prema Evrokodu 4
EP  - 145
IS  - 1
SP  - 133
VL  - 9
DO  - 10.2298/FUACE1101133K
ER  - 

@article{
author = "Kostić, Svetlana M. and Deretić-Stojanović, Biljana and Stošić, Saša",
year = "2011",
abstract = "Different analytical methods, with different levels of approximations and accuracy, are available for analysis of continuous composite steel-concrete beams. The Eurocode 4 recommends few simple methods for calculation of creep, shrinkage, cracking of concrete and shear lag effects that are explained in the paper. Through the numerical examples of four continuous composite steel-concrete beams, the proposed methods of analyses are evaluated and compared. Practical recommendations for analysis of this type of girders are formulated., Za analizu spregnutih kontinualnih nosača od čelika i betona postoje različite analitičke metode, različitog stepena tačnosti. Evrokod 4 dozvoljava i preporučuje nekoliko jednostavnih metoda kojima se u proračun uvode nelinearni efekti kao što su skupljanje i tečenje betona, ispicalost betonske ploče i shear-lag efekat, i one su objašnjene u radu. Kroz numeričku analizu četiri spregnuta kontinualna nosača ove metode su upoređene i date su praktične preporuke za analizu ove grupe nosača.",
publisher = "Univerzitet u Nišu, Niš",
journal = "Facta universitatis - series: Architecture and Civil Engineering",
title = "Redistribution effects in linear elastic analyses of continuous composite steel-concrete beams according to Eurocode 4, Redistribucija uticaja u linearno elastičnoj analizi spregnutih kontinualnih nosača od čelika i betona prema Evrokodu 4",
pages = "145-133",
number = "1",
volume = "9",
doi = "10.2298/FUACE1101133K"
}

Kostić, S. M., Deretić-Stojanović, B.,& Stošić, S.. (2011). Redistribution effects in linear elastic analyses of continuous composite steel-concrete beams according to Eurocode 4. in Facta universitatis - series: Architecture and Civil Engineering
Univerzitet u Nišu, Niš., 9(1), 133-145.
https://doi.org/10.2298/FUACE1101133K

Kostić SM, Deretić-Stojanović B, Stošić S. Redistribution effects in linear elastic analyses of continuous composite steel-concrete beams according to Eurocode 4. in Facta universitatis - series: Architecture and Civil Engineering. 2011;9(1):133-145.
doi:10.2298/FUACE1101133K .

Kostić, Svetlana M., Deretić-Stojanović, Biljana, Stošić, Saša, "Redistribution effects in linear elastic analyses of continuous composite steel-concrete beams according to Eurocode 4" in Facta universitatis - series: Architecture and Civil Engineering, 9, no. 1 (2011):133-145,
https://doi.org/10.2298/FUACE1101133K . .

TY  - JOUR
AU  - Deretić-Stojanović, Biljana
AU  - Kostić, Svetlana M.
AU  - Marković, Nenad
PY  - 2010
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/317
AB  - In this paper, the analysis of longitudinal shear in concrete slab, according to Eurocode 4 (EN 1994-1-1:2004), is shown. The potential surfaces of shear failure in solid and composite slab are analyzed. For each potential surface of shear failure, the corresponding length is defined. The transverse reinforcement should be determined from the condition that, for any potential surface of shear failure, the design longitudinal shear per unit length (shear flow) is not greater than the longitudinal shear resistance of the slab per unit length. The longitudinal shear resistance of concrete slab per unit length should be determined according to EN 1992-1-1. The rules for transverse reinforcement are based on a truss analogy, i.e. the concrete slab is considered as a truss system that has compressed concrete struts and tensioned reinforcement (chords).The failure occurs when either the reinforcement yields or the concrete struts fail in compression. The transverse reinforcement in the concrete slab transfers the shear stresses from studs (shear connectors) and ensures that the premature failure of the slab will not occur.
AB  - U radu se prikazuje proračun podužnog smicanja u betonskoj ploči prema Evrokodu 4 (EN 1994-1-1:2004). Analiziraju se potencijalne površine loma usled podužnog smicanja, u punoj i spregnutoj betonskoj ploči. Za svaku potencijalnu površinu loma definiše se odgovarajuća dužina površine smicanja. Proračun nosivosti pri podužnom smicanju se zasniva na uslovu da proračunski podužni napon smicanja, bilo koje potencijalne površine loma usled podužnog smicanja u okviru ploče, ne bude veći od proračunske nosivosti pri podužnom smicanju. Proračunska nosivost pri podužnom smicanju betonske ploče se određuje u skladu sa EN 1992-1-1. Ovaj proračun se zasniva na modelu rešetke, tj. betonska ploča se posmatra kao sistem kosih (dijagonalnih) pritisnutih betonskih štapova kombinovan sa zategama koje predstavlja poprečna zategnuta armatura. Gubitak nosivosti (lom) betonske ploče nastaje ako dođe do tečenja (loma) u armaturi ili ako dođe do drobljenja betona u pritisnutim štapovima. U betonskoj ploči se obezbeđuje adekvatna površina poprečne armature koja će da prenese smičuće napone iz moždanika i obezbedi da ne dođe do prevremenog loma u betonu.
PB  - Univerzitet u Nišu - Građevinsko-arhitektonski fakultet, Niš
T2  - Zbornik radova Građevinsko-arhitektonskog fakulteta, Niš
T1  - Longitudinal shear of concrete slab in composite beam analysis according to EC4
T1  - Proračun podužnog smicanja u betonskoj ploči spregnutog nosača prema EC4
EP  - 64
IS  - 25
SP  - 57
UR  - https://hdl.handle.net/21.15107/rcub_grafar_317
ER  - 

@article{
author = "Deretić-Stojanović, Biljana and Kostić, Svetlana M. and Marković, Nenad",
year = "2010",
abstract = "In this paper, the analysis of longitudinal shear in concrete slab, according to Eurocode 4 (EN 1994-1-1:2004), is shown. The potential surfaces of shear failure in solid and composite slab are analyzed. For each potential surface of shear failure, the corresponding length is defined. The transverse reinforcement should be determined from the condition that, for any potential surface of shear failure, the design longitudinal shear per unit length (shear flow) is not greater than the longitudinal shear resistance of the slab per unit length. The longitudinal shear resistance of concrete slab per unit length should be determined according to EN 1992-1-1. The rules for transverse reinforcement are based on a truss analogy, i.e. the concrete slab is considered as a truss system that has compressed concrete struts and tensioned reinforcement (chords).The failure occurs when either the reinforcement yields or the concrete struts fail in compression. The transverse reinforcement in the concrete slab transfers the shear stresses from studs (shear connectors) and ensures that the premature failure of the slab will not occur., U radu se prikazuje proračun podužnog smicanja u betonskoj ploči prema Evrokodu 4 (EN 1994-1-1:2004). Analiziraju se potencijalne površine loma usled podužnog smicanja, u punoj i spregnutoj betonskoj ploči. Za svaku potencijalnu površinu loma definiše se odgovarajuća dužina površine smicanja. Proračun nosivosti pri podužnom smicanju se zasniva na uslovu da proračunski podužni napon smicanja, bilo koje potencijalne površine loma usled podužnog smicanja u okviru ploče, ne bude veći od proračunske nosivosti pri podužnom smicanju. Proračunska nosivost pri podužnom smicanju betonske ploče se određuje u skladu sa EN 1992-1-1. Ovaj proračun se zasniva na modelu rešetke, tj. betonska ploča se posmatra kao sistem kosih (dijagonalnih) pritisnutih betonskih štapova kombinovan sa zategama koje predstavlja poprečna zategnuta armatura. Gubitak nosivosti (lom) betonske ploče nastaje ako dođe do tečenja (loma) u armaturi ili ako dođe do drobljenja betona u pritisnutim štapovima. U betonskoj ploči se obezbeđuje adekvatna površina poprečne armature koja će da prenese smičuće napone iz moždanika i obezbedi da ne dođe do prevremenog loma u betonu.",
publisher = "Univerzitet u Nišu - Građevinsko-arhitektonski fakultet, Niš",
journal = "Zbornik radova Građevinsko-arhitektonskog fakulteta, Niš",
title = "Longitudinal shear of concrete slab in composite beam analysis according to EC4, Proračun podužnog smicanja u betonskoj ploči spregnutog nosača prema EC4",
pages = "64-57",
number = "25",
url = "https://hdl.handle.net/21.15107/rcub_grafar_317"
}

Deretić-Stojanović, B., Kostić, S. M.,& Marković, N.. (2010). Longitudinal shear of concrete slab in composite beam analysis according to EC4. in Zbornik radova Građevinsko-arhitektonskog fakulteta, Niš
Univerzitet u Nišu - Građevinsko-arhitektonski fakultet, Niš.(25), 57-64.
https://hdl.handle.net/21.15107/rcub_grafar_317

Deretić-Stojanović B, Kostić SM, Marković N. Longitudinal shear of concrete slab in composite beam analysis according to EC4. in Zbornik radova Građevinsko-arhitektonskog fakulteta, Niš. 2010;(25):57-64.
https://hdl.handle.net/21.15107/rcub_grafar_317 .

Deretić-Stojanović, Biljana, Kostić, Svetlana M., Marković, Nenad, "Longitudinal shear of concrete slab in composite beam analysis according to EC4" in Zbornik radova Građevinsko-arhitektonskog fakulteta, Niš, no. 25 (2010):57-64,
https://hdl.handle.net/21.15107/rcub_grafar_317 .

TY  - THES
AU  - Deretić-Stojanović, Biljana
PY  - 1992
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1817
T1  - Proračun spregnutih konstrukcija metodom deformacija
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1817
ER  - 

@phdthesis{
author = "Deretić-Stojanović, Biljana",
year = "1992",
title = "Proračun spregnutih konstrukcija metodom deformacija",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1817"
}

Deretić-Stojanović, B.. (1992). Proračun spregnutih konstrukcija metodom deformacija. .
https://hdl.handle.net/21.15107/rcub_grafar_1817

Deretić-Stojanović B. Proračun spregnutih konstrukcija metodom deformacija. 1992;.
https://hdl.handle.net/21.15107/rcub_grafar_1817 .

Deretić-Stojanović, Biljana, "Proračun spregnutih konstrukcija metodom deformacija" (1992),
https://hdl.handle.net/21.15107/rcub_grafar_1817 .