TY  - CONF
AU  - Kovačević, Saša
AU  - Marković, Nenad
AU  - Ćeranić, Aleksandar
AU  - Bendić, Milica
PY  - 2021
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2592
AB  - The paper reports a numerical investigation and determination of unfavorable geometric imperfection shapes in steel plate girders subjected to concentrated compressive forces by means of the ultimate limit state. This load case is present in many engineering applications, including beam-beam and beam-column connections, deep crane runway beams loaded by crane wheels, and during the incremental launching of multi-span steel and composite bridges over temporary or permanent supports. A parametric imperfection-sensitivity study has been performed on I-shaped steel plate girders employing geometrically and materially nonlinear finite element analysis. Experimentally measured, buckling mode-affine, and hand defined sinusoidal geometric imperfections were varied in the study in combination with varying patch load lengths and relative stiffnesses of the longitudinal stiffener. It is shown in the paper that geometric imperfections can play a decisive role and significantly affect the ultimate strength of longitudinally unstiffened and stiffened steel plate girders. Unfavorable geometric imperfection shapes in steel plate girders subjected to edge loading are governed by the patch load length and the relative stiffness of the longitudinal stiffener. Different unfavorable geometric imperfections were found for different patch load lengths and relative stiffnesses. Local geometric imperfections defined in the upper web sub-panel yield lower ultimate strengths than global geometric imperfections (defined over the whole web depth). The lowest ultimate strengths were returned for geometric imperfections that resembled the deformation at collapse (collapse-affine imperfections). Further research should focus on finding an equivalent shape that resembles the deformation at failure for different patch load lengths and girder characteristics.
C3  - Proceedings of the Annual Stability Conference Structural Stability Research Council Louisville, Kentucky, April 13-16, 2021
T1  - Unfavorable imperfection shapes in steel plate girders for web local crippling
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2592
ER  - 

@conference{
author = "Kovačević, Saša and Marković, Nenad and Ćeranić, Aleksandar and Bendić, Milica",
year = "2021",
abstract = "The paper reports a numerical investigation and determination of unfavorable geometric imperfection shapes in steel plate girders subjected to concentrated compressive forces by means of the ultimate limit state. This load case is present in many engineering applications, including beam-beam and beam-column connections, deep crane runway beams loaded by crane wheels, and during the incremental launching of multi-span steel and composite bridges over temporary or permanent supports. A parametric imperfection-sensitivity study has been performed on I-shaped steel plate girders employing geometrically and materially nonlinear finite element analysis. Experimentally measured, buckling mode-affine, and hand defined sinusoidal geometric imperfections were varied in the study in combination with varying patch load lengths and relative stiffnesses of the longitudinal stiffener. It is shown in the paper that geometric imperfections can play a decisive role and significantly affect the ultimate strength of longitudinally unstiffened and stiffened steel plate girders. Unfavorable geometric imperfection shapes in steel plate girders subjected to edge loading are governed by the patch load length and the relative stiffness of the longitudinal stiffener. Different unfavorable geometric imperfections were found for different patch load lengths and relative stiffnesses. Local geometric imperfections defined in the upper web sub-panel yield lower ultimate strengths than global geometric imperfections (defined over the whole web depth). The lowest ultimate strengths were returned for geometric imperfections that resembled the deformation at collapse (collapse-affine imperfections). Further research should focus on finding an equivalent shape that resembles the deformation at failure for different patch load lengths and girder characteristics.",
journal = "Proceedings of the Annual Stability Conference Structural Stability Research Council Louisville, Kentucky, April 13-16, 2021",
title = "Unfavorable imperfection shapes in steel plate girders for web local crippling",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2592"
}

Kovačević, S., Marković, N., Ćeranić, A.,& Bendić, M.. (2021). Unfavorable imperfection shapes in steel plate girders for web local crippling. in Proceedings of the Annual Stability Conference Structural Stability Research Council Louisville, Kentucky, April 13-16, 2021.
https://hdl.handle.net/21.15107/rcub_grafar_2592

Kovačević S, Marković N, Ćeranić A, Bendić M. Unfavorable imperfection shapes in steel plate girders for web local crippling. in Proceedings of the Annual Stability Conference Structural Stability Research Council Louisville, Kentucky, April 13-16, 2021. 2021;.
https://hdl.handle.net/21.15107/rcub_grafar_2592 .

Kovačević, Saša, Marković, Nenad, Ćeranić, Aleksandar, Bendić, Milica, "Unfavorable imperfection shapes in steel plate girders for web local crippling" in Proceedings of the Annual Stability Conference Structural Stability Research Council Louisville, Kentucky, April 13-16, 2021 (2021),
https://hdl.handle.net/21.15107/rcub_grafar_2592 .

TY  - JOUR
AU  - Kovačević, Saša
AU  - Marković, Nenad
AU  - Šumarac, Dragoslav
AU  - Salatić, Ratko
PY  - 2019
UR  - https://www.sciencedirect.com/science/article/pii/S0143974X18310782
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1839
AB  - The companion paper Part I [1] deals with the experimental campaign of longitudinally stiffened plate girders
subjected exclusively to patch loading. The current paper focuses on the numerical research and parametric
study of the influence of patch load length and initial geometrical imperfections on the ultimate strength of lon-
gitudinallystiffenedplategirders.Inordertoassessthepatchloadresistance,ageometricallyandmateriallynon-
linear finite element analysis has been performed. For a better verification with the experimental results, the
finiteelement modelincludestheexperimentally measuredinitialgeometricalimperfectionsand material prop-
erties based on laboratory tests. The verification of the numerical model has been obtained through the compar-
ison of the numerically and experimentally attained results for the ultimate loads and elastoplastic behavior of
the girders. It has been shown that the numerical and experimental results are in perfect agreement, which en-
abledafruitfulbackgroundforparametricanalysis,inwhichdifferentinitialgeometricalimperfectionshavebeen
used to ameliorate understandings about their influence on the ultimate strength under different patch load
lengths. Conclusively, it may be stated that initial geometrical imperfections can play a decisive role, especially
for longitudinally stiffened girders. Initial geometrical imperfections of stiffened girders that correspond to de-
formed shape at the collapse (collapse-affine imperfections), especially in the zone where the load is applied,
will give the most unfavorable ultimate strengths. For the considered geometry in the present paper, the third
buckling mode of longitudinally stiffened girders corresponds to the deformed shape and the lowest ultimate
strengths are obtained.
T2  - Journal of Construction Steel Research
T1  - Influence of patch load length on plate girders. Part II: Numerical research
VL  - 158
DO  - 10.1016/j.jcsr.2019.03.025
ER  - 

@article{
author = "Kovačević, Saša and Marković, Nenad and Šumarac, Dragoslav and Salatić, Ratko",
year = "2019",
abstract = "The companion paper Part I [1] deals with the experimental campaign of longitudinally stiffened plate girders
subjected exclusively to patch loading. The current paper focuses on the numerical research and parametric
study of the influence of patch load length and initial geometrical imperfections on the ultimate strength of lon-
gitudinallystiffenedplategirders.Inordertoassessthepatchloadresistance,ageometricallyandmateriallynon-
linear finite element analysis has been performed. For a better verification with the experimental results, the
finiteelement modelincludestheexperimentally measuredinitialgeometricalimperfectionsand material prop-
erties based on laboratory tests. The verification of the numerical model has been obtained through the compar-
ison of the numerically and experimentally attained results for the ultimate loads and elastoplastic behavior of
the girders. It has been shown that the numerical and experimental results are in perfect agreement, which en-
abledafruitfulbackgroundforparametricanalysis,inwhichdifferentinitialgeometricalimperfectionshavebeen
used to ameliorate understandings about their influence on the ultimate strength under different patch load
lengths. Conclusively, it may be stated that initial geometrical imperfections can play a decisive role, especially
for longitudinally stiffened girders. Initial geometrical imperfections of stiffened girders that correspond to de-
formed shape at the collapse (collapse-affine imperfections), especially in the zone where the load is applied,
will give the most unfavorable ultimate strengths. For the considered geometry in the present paper, the third
buckling mode of longitudinally stiffened girders corresponds to the deformed shape and the lowest ultimate
strengths are obtained.",
journal = "Journal of Construction Steel Research",
title = "Influence of patch load length on plate girders. Part II: Numerical research",
volume = "158",
doi = "10.1016/j.jcsr.2019.03.025"
}

Kovačević, S., Marković, N., Šumarac, D.,& Salatić, R.. (2019). Influence of patch load length on plate girders. Part II: Numerical research. in Journal of Construction Steel Research, 158.
https://doi.org/10.1016/j.jcsr.2019.03.025

Kovačević S, Marković N, Šumarac D, Salatić R. Influence of patch load length on plate girders. Part II: Numerical research. in Journal of Construction Steel Research. 2019;158.
doi:10.1016/j.jcsr.2019.03.025 .

Kovačević, Saša, Marković, Nenad, Šumarac, Dragoslav, Salatić, Ratko, "Influence of patch load length on plate girders. Part II: Numerical research" in Journal of Construction Steel Research, 158 (2019),
https://doi.org/10.1016/j.jcsr.2019.03.025 . .

TY  - JOUR
AU  - Borković, A.
AU  - Kovačević, Saša
AU  - Radenković, Gligor
AU  - Milovanović, S.
AU  - Majstorović, D.
PY  - 2019
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1005
AB  - A novel rotation-free isogeometric formulation of in-plane dynamic analysis of an arbitrarily curved Bernoulli-Euler beam in the convective frame of reference is presented. The driving force behind the present study has been the development of the NURBS-based element which enables an elegant framework of in-plane vibrations of arbitrarily curved Bernoulli-Euler beams, being a function only of the global Cartesian coordinates. Due to the fact that no additional simplifications are made, besides those related to the classic Bernoulli-Euler hypothesis and small strain theory, the formulation is particularly applicable for problems regarding the behavior of strongly curved beams. An excellent agreement of the results is accomplished and efficiency for academic and practical use are shown. The influence of the product of the maximum curvature and the thickness of the beam on the accuracy of the solution is specially treated and debated. The effects of the hpk-refinements are thoroughly checked and a highly nonlinear convergence behavior under the h-refinement is noticed. The well-known fact that models with the highest interelement continuities return superior accuracy per degree of freedom is substantiated by an in-depth numerical analysis of order of convergence. Furthermore, the accuracy of the developed model is analyzed utilizing normalized numerical discrete spectrums. It is remarked that the accuracy per degree of freedom degrades with the complexity of reference geometry of the beam.
PB  - Elsevier Ltd
T2  - Engineering Structures
T1  - Rotation-free isogeometric dynamic analysis of an arbitrarily curved plane Bernoulli-Euler beam
EP  - 215
SP  - 192
VL  - 181
DO  - 10.1016/j.engstruct.2018.12.003
ER  - 

@article{
author = "Borković, A. and Kovačević, Saša and Radenković, Gligor and Milovanović, S. and Majstorović, D.",
year = "2019",
abstract = "A novel rotation-free isogeometric formulation of in-plane dynamic analysis of an arbitrarily curved Bernoulli-Euler beam in the convective frame of reference is presented. The driving force behind the present study has been the development of the NURBS-based element which enables an elegant framework of in-plane vibrations of arbitrarily curved Bernoulli-Euler beams, being a function only of the global Cartesian coordinates. Due to the fact that no additional simplifications are made, besides those related to the classic Bernoulli-Euler hypothesis and small strain theory, the formulation is particularly applicable for problems regarding the behavior of strongly curved beams. An excellent agreement of the results is accomplished and efficiency for academic and practical use are shown. The influence of the product of the maximum curvature and the thickness of the beam on the accuracy of the solution is specially treated and debated. The effects of the hpk-refinements are thoroughly checked and a highly nonlinear convergence behavior under the h-refinement is noticed. The well-known fact that models with the highest interelement continuities return superior accuracy per degree of freedom is substantiated by an in-depth numerical analysis of order of convergence. Furthermore, the accuracy of the developed model is analyzed utilizing normalized numerical discrete spectrums. It is remarked that the accuracy per degree of freedom degrades with the complexity of reference geometry of the beam.",
publisher = "Elsevier Ltd",
journal = "Engineering Structures",
title = "Rotation-free isogeometric dynamic analysis of an arbitrarily curved plane Bernoulli-Euler beam",
pages = "215-192",
volume = "181",
doi = "10.1016/j.engstruct.2018.12.003"
}

Borković, A., Kovačević, S., Radenković, G., Milovanović, S.,& Majstorović, D.. (2019). Rotation-free isogeometric dynamic analysis of an arbitrarily curved plane Bernoulli-Euler beam. in Engineering Structures
Elsevier Ltd., 181, 192-215.
https://doi.org/10.1016/j.engstruct.2018.12.003

Borković A, Kovačević S, Radenković G, Milovanović S, Majstorović D. Rotation-free isogeometric dynamic analysis of an arbitrarily curved plane Bernoulli-Euler beam. in Engineering Structures. 2019;181:192-215.
doi:10.1016/j.engstruct.2018.12.003 .

Borković, A., Kovačević, Saša, Radenković, Gligor, Milovanović, S., Majstorović, D., "Rotation-free isogeometric dynamic analysis of an arbitrarily curved plane Bernoulli-Euler beam" in Engineering Structures, 181 (2019):192-215,
https://doi.org/10.1016/j.engstruct.2018.12.003 . .

TY  - CONF
AU  - Jakovljević, Isidora
AU  - Kovačević, Saša
AU  - Marković, Nenad
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1653
AB  - The determination of the elastic critical load (buckling load) is an important element of the assessment of the ultimate load of plate girders. An analysis of the critical load of a plate corresponding to the web of an I-girder for different boundary conditions and the critical load of the I-girder itself is given in the paper. Conclusions regarding their correspondence are given. Also, experimentally determined ultimate loads of I-girders are compared with values according to Eurocode for the models used in this analysis.
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  - Buckling of plates and plate girders subjected to patch load
EP  - 617
SP  - 608
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1653
ER  - 

@conference{
author = "Jakovljević, Isidora and Kovačević, Saša and Marković, Nenad",
year = "2018",
abstract = "The determination of the elastic critical load (buckling load) is an important element of the assessment of the ultimate load of plate girders. An analysis of the critical load of a plate corresponding to the web of an I-girder for different boundary conditions and the critical load of the I-girder itself is given in the paper. Conclusions regarding their correspondence are given. Also, experimentally determined ultimate loads of I-girders are compared with values according to Eurocode for the models used in this analysis.",
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 = "Buckling of plates and plate girders subjected to patch load",
pages = "617-608",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1653"
}

Jakovljević, I., Kovačević, S.,& Marković, N.. (2018). Buckling of plates and plate girders subjected to patch load. in ASES International congress proceedings / Association of Structural Engineers of Serbia, 15th Congress, September 6-8th, 2018, Zlatibor
Društvo građevinskih konstruktera Srbije, Beograd., 608-617.
https://hdl.handle.net/21.15107/rcub_grafar_1653

Jakovljević I, Kovačević S, Marković N. Buckling of plates and plate girders subjected to patch load. in ASES International congress proceedings / Association of Structural Engineers of Serbia, 15th Congress, September 6-8th, 2018, Zlatibor. 2018;:608-617.
https://hdl.handle.net/21.15107/rcub_grafar_1653 .

Jakovljević, Isidora, Kovačević, Saša, Marković, Nenad, "Buckling of plates and plate girders subjected to patch load" in ASES International congress proceedings / Association of Structural Engineers of Serbia, 15th Congress, September 6-8th, 2018, Zlatibor (2018):608-617,
https://hdl.handle.net/21.15107/rcub_grafar_1653 .

TY  - JOUR
AU  - Jakovljević, Isidora
AU  - Kovačević, Saša
AU  - Marković, Nenad
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/925
AB  - The determination of the elastic critical load (buckling load) is an important element of the assessment of the ultimate load of plate girders according to Eurocode 3 for design of steel structures. An analysis of the critical load of a plate corresponding to the web of an I-girder for different boundary conditions and the critical load of the I-girder itself subjected to patch load is given in the paper. Conclusions regarding their correspondence are given. Also, experimentally determined ultimate loads of I-girders are compared with predictive values according to Eurocode 3 for the models used in this analysis. A modified procedure for the ultimate load determination is proposed by following the Eurocode 3 algorithm and changing only buckling coefficient. In order to improve the ultimate load prediction, it is suggested to calculate the buckling coefficient also as a function of patch load length.
AB  - Određivanje elastične kritične sile (sile izbočavanja) predstavlja važan element u određivanju granične nosivosti limenih nosača prema Evrokodu 3 za proračun čeličnih konstrukcija. U radu se daje analiza kritične sile izbočavanja izolovane ploče koja odgovara rebru Inosača s variranim uslovima oslanjanja i kritične sile koja odgovara samom I-nosaču, usled dejstva lokalizovanog opterećenja. Dati su zaključci o njihovoj vezi. Takođe, upoređena su eksperimentalno određena granična opterećenja I-nosača s vrednostima prema Evrokodu 3, za modele korišćene u ovoj analizi. Predložena je izmenjena procedura za određivanje granične nosivosti, koja sledi algoritam dat u Evrokodu 3, a prema kojoj se modifikuje izraz za određivanje koeficijenta izbočavanja. Kako bi se poboljšalo određivanje granične nosivosti, predloženo je računanje koeficijenata izbočavanja i u funkciji dužine lokalizovanog opterećenja.
PB  - Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije, Beograd
T2  - Građevinski materijali i konstrukcije
T1  - Elastic critical load of plates and plate girders subjected to patch load
T1  - Elastična kritična sila ploča i limenih nosača pod dejstvom lokalizovanog opterećenja
EP  - 67
IS  - 4
SP  - 55
VL  - 61
DO  - 10.5937/GRMK1804055J
ER  - 

@article{
author = "Jakovljević, Isidora and Kovačević, Saša and Marković, Nenad",
year = "2018",
abstract = "The determination of the elastic critical load (buckling load) is an important element of the assessment of the ultimate load of plate girders according to Eurocode 3 for design of steel structures. An analysis of the critical load of a plate corresponding to the web of an I-girder for different boundary conditions and the critical load of the I-girder itself subjected to patch load is given in the paper. Conclusions regarding their correspondence are given. Also, experimentally determined ultimate loads of I-girders are compared with predictive values according to Eurocode 3 for the models used in this analysis. A modified procedure for the ultimate load determination is proposed by following the Eurocode 3 algorithm and changing only buckling coefficient. In order to improve the ultimate load prediction, it is suggested to calculate the buckling coefficient also as a function of patch load length., Određivanje elastične kritične sile (sile izbočavanja) predstavlja važan element u određivanju granične nosivosti limenih nosača prema Evrokodu 3 za proračun čeličnih konstrukcija. U radu se daje analiza kritične sile izbočavanja izolovane ploče koja odgovara rebru Inosača s variranim uslovima oslanjanja i kritične sile koja odgovara samom I-nosaču, usled dejstva lokalizovanog opterećenja. Dati su zaključci o njihovoj vezi. Takođe, upoređena su eksperimentalno određena granična opterećenja I-nosača s vrednostima prema Evrokodu 3, za modele korišćene u ovoj analizi. Predložena je izmenjena procedura za određivanje granične nosivosti, koja sledi algoritam dat u Evrokodu 3, a prema kojoj se modifikuje izraz za određivanje koeficijenta izbočavanja. Kako bi se poboljšalo određivanje granične nosivosti, predloženo je računanje koeficijenata izbočavanja i u funkciji dužine lokalizovanog opterećenja.",
publisher = "Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije, Beograd",
journal = "Građevinski materijali i konstrukcije",
title = "Elastic critical load of plates and plate girders subjected to patch load, Elastična kritična sila ploča i limenih nosača pod dejstvom lokalizovanog opterećenja",
pages = "67-55",
number = "4",
volume = "61",
doi = "10.5937/GRMK1804055J"
}

Jakovljević, I., Kovačević, S.,& Marković, N.. (2018). Elastic critical load of plates and plate girders subjected to patch load. in Građevinski materijali i konstrukcije
Društvo za ispitivanje i istraživanje materijala i konstrukcija Srbije, Beograd., 61(4), 55-67.
https://doi.org/10.5937/GRMK1804055J

Jakovljević I, Kovačević S, Marković N. Elastic critical load of plates and plate girders subjected to patch load. in Građevinski materijali i konstrukcije. 2018;61(4):55-67.
doi:10.5937/GRMK1804055J .

Jakovljević, Isidora, Kovačević, Saša, Marković, Nenad, "Elastic critical load of plates and plate girders subjected to patch load" in Građevinski materijali i konstrukcije, 61, no. 4 (2018):55-67,
https://doi.org/10.5937/GRMK1804055J . .

TY  - JOUR
AU  - Borković, A.
AU  - Kovačević, Saša
AU  - Radenković, Gligor
AU  - Milovanović, S.
AU  - Guzijan-Dilber, M.
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/964
AB  - The present study elucidates linear static analysis for plane beam structures using the isogeometric approach. A novel methodology for rotation-free analysis of an arbitrarily curved Bernoulli-Euler beam in the convective frame of reference is derived in detail. The full degeneration of a 3D continuum beam to a 1D line has been presented and a fully applicable isogeometric finite element has been obtained. The driving force behind developing the present research has been the derivation of the NURBS-based isogeometric analysis which will enable an elegant formulation of the plane Bernoulli-Euler beams, being a function only of the global rectangular Cartesian coordinates. The verification and accuracy of the research are obtained via a thorough comparison between theory, finite element analyses and relevant examples from literature. An excellent agreement of results is achieved and usefulness for academic and practical purposes alike are proved. The effects of the hpk-refinements are illuminated and it is observed that the convergences for the most variables and refinement techniques are not monotonic. A special attention is paid to the influence of the product of maximum curvature and thickness of beam on the accuracy of the solution. The limits of applicability of the present approach are defined for a few specific types of analyses. The derived formulation is geometrically exact and appropriate for the analysis of strongly curved Bernoulli-Euler beams.
PB  - Elsevier B.V.
T2  - Computer Methods in Applied Mechanics and Engineering
T1  - Rotation-free isogeometric analysis of an arbitrarily curved plane Bernoulli-Euler beam
EP  - 267
SP  - 238
VL  - 334
DO  - 10.1016/j.cma.2018.02.002
ER  - 

@article{
author = "Borković, A. and Kovačević, Saša and Radenković, Gligor and Milovanović, S. and Guzijan-Dilber, M.",
year = "2018",
abstract = "The present study elucidates linear static analysis for plane beam structures using the isogeometric approach. A novel methodology for rotation-free analysis of an arbitrarily curved Bernoulli-Euler beam in the convective frame of reference is derived in detail. The full degeneration of a 3D continuum beam to a 1D line has been presented and a fully applicable isogeometric finite element has been obtained. The driving force behind developing the present research has been the derivation of the NURBS-based isogeometric analysis which will enable an elegant formulation of the plane Bernoulli-Euler beams, being a function only of the global rectangular Cartesian coordinates. The verification and accuracy of the research are obtained via a thorough comparison between theory, finite element analyses and relevant examples from literature. An excellent agreement of results is achieved and usefulness for academic and practical purposes alike are proved. The effects of the hpk-refinements are illuminated and it is observed that the convergences for the most variables and refinement techniques are not monotonic. A special attention is paid to the influence of the product of maximum curvature and thickness of beam on the accuracy of the solution. The limits of applicability of the present approach are defined for a few specific types of analyses. The derived formulation is geometrically exact and appropriate for the analysis of strongly curved Bernoulli-Euler beams.",
publisher = "Elsevier B.V.",
journal = "Computer Methods in Applied Mechanics and Engineering",
title = "Rotation-free isogeometric analysis of an arbitrarily curved plane Bernoulli-Euler beam",
pages = "267-238",
volume = "334",
doi = "10.1016/j.cma.2018.02.002"
}

Borković, A., Kovačević, S., Radenković, G., Milovanović, S.,& Guzijan-Dilber, M.. (2018). Rotation-free isogeometric analysis of an arbitrarily curved plane Bernoulli-Euler beam. in Computer Methods in Applied Mechanics and Engineering
Elsevier B.V.., 334, 238-267.
https://doi.org/10.1016/j.cma.2018.02.002

Borković A, Kovačević S, Radenković G, Milovanović S, Guzijan-Dilber M. Rotation-free isogeometric analysis of an arbitrarily curved plane Bernoulli-Euler beam. in Computer Methods in Applied Mechanics and Engineering. 2018;334:238-267.
doi:10.1016/j.cma.2018.02.002 .

Borković, A., Kovačević, Saša, Radenković, Gligor, Milovanović, S., Guzijan-Dilber, M., "Rotation-free isogeometric analysis of an arbitrarily curved plane Bernoulli-Euler beam" in Computer Methods in Applied Mechanics and Engineering, 334 (2018):238-267,
https://doi.org/10.1016/j.cma.2018.02.002 . .

TY  - JOUR
AU  - Borković, A.
AU  - Kovačević, Saša
AU  - Milasinović, D. D.
AU  - Radenković, Gligor
AU  - Mijatović, O.
AU  - Golubović-Bugarski, V.
PY  - 2017
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/842
AB  - The present study sheds light on geometric nonlinear static analysis of prismatic shells using the semi-analytical finite strip method. A new computational model, which includes a fully nonlinear compound strip with a longitudinal and transverse stiffener, has been presented. Furthermore, strips with non-uniform characteristics in the longitudinal direction have been used in nonlinear analysis. This has, to the best knowledge of authors, never been reported. Also, this paper describes the design and implementation of eighteen ideal boundary conditions using three different longitudinal and six well-known transverse displacement interpolation functions. The results of the presented study were obtained using an open-source software and multi-purpose software Abaqus. Moreover, the accuracy of the applied computational approach has been verified by comparison with results from the literature. An excellent agreement of displacement fields is achieved for large deflection analyses of plates with a hole and stiffeners as well as for shells with a stepped thickness in the longitudinal direction. Additionally, results from post-buckling analyses of thin-walled structures, a snap-through and snap-back behavior of shallow shells, are matched. The work presented here has profound implications for future studies of the finite strip deployment.
PB  - Elsevier Ltd
T2  - Thin-Walled Structures
T1  - Geometric nonlinear analysis of prismatic shells using the semi-analytical finite strip method
EP  - 88
SP  - 63
VL  - 117
DO  - 10.1016/j.tws.2017.03.033
ER  - 

@article{
author = "Borković, A. and Kovačević, Saša and Milasinović, D. D. and Radenković, Gligor and Mijatović, O. and Golubović-Bugarski, V.",
year = "2017",
abstract = "The present study sheds light on geometric nonlinear static analysis of prismatic shells using the semi-analytical finite strip method. A new computational model, which includes a fully nonlinear compound strip with a longitudinal and transverse stiffener, has been presented. Furthermore, strips with non-uniform characteristics in the longitudinal direction have been used in nonlinear analysis. This has, to the best knowledge of authors, never been reported. Also, this paper describes the design and implementation of eighteen ideal boundary conditions using three different longitudinal and six well-known transverse displacement interpolation functions. The results of the presented study were obtained using an open-source software and multi-purpose software Abaqus. Moreover, the accuracy of the applied computational approach has been verified by comparison with results from the literature. An excellent agreement of displacement fields is achieved for large deflection analyses of plates with a hole and stiffeners as well as for shells with a stepped thickness in the longitudinal direction. Additionally, results from post-buckling analyses of thin-walled structures, a snap-through and snap-back behavior of shallow shells, are matched. The work presented here has profound implications for future studies of the finite strip deployment.",
publisher = "Elsevier Ltd",
journal = "Thin-Walled Structures",
title = "Geometric nonlinear analysis of prismatic shells using the semi-analytical finite strip method",
pages = "88-63",
volume = "117",
doi = "10.1016/j.tws.2017.03.033"
}

Borković, A., Kovačević, S., Milasinović, D. D., Radenković, G., Mijatović, O.,& Golubović-Bugarski, V.. (2017). Geometric nonlinear analysis of prismatic shells using the semi-analytical finite strip method. in Thin-Walled Structures
Elsevier Ltd., 117, 63-88.
https://doi.org/10.1016/j.tws.2017.03.033

Borković A, Kovačević S, Milasinović DD, Radenković G, Mijatović O, Golubović-Bugarski V. Geometric nonlinear analysis of prismatic shells using the semi-analytical finite strip method. in Thin-Walled Structures. 2017;117:63-88.
doi:10.1016/j.tws.2017.03.033 .

Borković, A., Kovačević, Saša, Milasinović, D. D., Radenković, Gligor, Mijatović, O., Golubović-Bugarski, V., "Geometric nonlinear analysis of prismatic shells using the semi-analytical finite strip method" in Thin-Walled Structures, 117 (2017):63-88,
https://doi.org/10.1016/j.tws.2017.03.033 . .

TY  - CONF
AU  - Todorović, Marija
AU  - Kovačević, Saša
AU  - Pavlović, Marko
AU  - Spremić, Milan
AU  - Marković, Zlatko
PY  - 2014
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1247
PB  - ECCS, Brussels
C3  - Eurosteel 2014 : 7th European conference on steel composite structures : September 10-12, 2014 Naples, Italy
T1  - Behaviour of prefabricated steel-concrete composite bridge decks with grouped headed studs and bolted shear connectors
EP  - 589
SP  - 587
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1247
ER  - 

@conference{
author = "Todorović, Marija and Kovačević, Saša and Pavlović, Marko and Spremić, Milan and Marković, Zlatko",
year = "2014",
publisher = "ECCS, Brussels",
journal = "Eurosteel 2014 : 7th European conference on steel composite structures : September 10-12, 2014 Naples, Italy",
title = "Behaviour of prefabricated steel-concrete composite bridge decks with grouped headed studs and bolted shear connectors",
pages = "589-587",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1247"
}

Todorović, M., Kovačević, S., Pavlović, M., Spremić, M.,& Marković, Z.. (2014). Behaviour of prefabricated steel-concrete composite bridge decks with grouped headed studs and bolted shear connectors. in Eurosteel 2014 : 7th European conference on steel composite structures : September 10-12, 2014 Naples, Italy
ECCS, Brussels., 587-589.
https://hdl.handle.net/21.15107/rcub_grafar_1247

Todorović M, Kovačević S, Pavlović M, Spremić M, Marković Z. Behaviour of prefabricated steel-concrete composite bridge decks with grouped headed studs and bolted shear connectors. in Eurosteel 2014 : 7th European conference on steel composite structures : September 10-12, 2014 Naples, Italy. 2014;:587-589.
https://hdl.handle.net/21.15107/rcub_grafar_1247 .

Todorović, Marija, Kovačević, Saša, Pavlović, Marko, Spremić, Milan, Marković, Zlatko, "Behaviour of prefabricated steel-concrete composite bridge decks with grouped headed studs and bolted shear connectors" in Eurosteel 2014 : 7th European conference on steel composite structures : September 10-12, 2014 Naples, Italy (2014):587-589,
https://hdl.handle.net/21.15107/rcub_grafar_1247 .

TY  - CONF
AU  - Radenković, Gligor
AU  - Kovačević, Saša
PY  - 2014
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1264
AB  - The Bernoulli–Euler and Timoshenko’s theory of arbitrary curved beam is derived in the system of NURBS parametric coordinates and detailed in the book [1]. The stiffness matrix of finite elements and overall structure are programmed in the software package Mathematica. A range of isogeometric Bernoulli–Euler beam elements is formulated, starting with C1 up to arbitrarily continuity Cp-1, where p is the degree of rational NURBS function. The results obtained in a number of examples that include accuracy, convergence and convergence speed of solutions were compared with the results obtained from the software package ABAQUS.
PB  - Gradjevinski fakultet, Subotica
C3  - Međunarodna konferencija Savremena dostignuća u građevinarstvu 25
T1  - Beam theory in spline parametric cooridinate. Part II: examples
T1  - Teorija štapa u spline parametarskoj koordinati – II deo: primeri
EP  - 415
SP  - 411
VL  - 30
DO  - 10.14415/konferencijaGFS2014.056
ER  - 

@conference{
author = "Radenković, Gligor and Kovačević, Saša",
year = "2014",
abstract = "The Bernoulli–Euler and Timoshenko’s theory of arbitrary curved beam is derived in the system of NURBS parametric coordinates and detailed in the book [1]. The stiffness matrix of finite elements and overall structure are programmed in the software package Mathematica. A range of isogeometric Bernoulli–Euler beam elements is formulated, starting with C1 up to arbitrarily continuity Cp-1, where p is the degree of rational NURBS function. The results obtained in a number of examples that include accuracy, convergence and convergence speed of solutions were compared with the results obtained from the software package ABAQUS.",
publisher = "Gradjevinski fakultet, Subotica",
journal = "Međunarodna konferencija Savremena dostignuća u građevinarstvu 25",
title = "Beam theory in spline parametric cooridinate. Part II: examples, Teorija štapa u spline parametarskoj koordinati – II deo: primeri",
pages = "415-411",
volume = "30",
doi = "10.14415/konferencijaGFS2014.056"
}

Radenković, G.,& Kovačević, S.. (2014). Beam theory in spline parametric cooridinate. Part II: examples. in Međunarodna konferencija Savremena dostignuća u građevinarstvu 25
Gradjevinski fakultet, Subotica., 30, 411-415.
https://doi.org/10.14415/konferencijaGFS2014.056

Radenković G, Kovačević S. Beam theory in spline parametric cooridinate. Part II: examples. in Međunarodna konferencija Savremena dostignuća u građevinarstvu 25. 2014;30:411-415.
doi:10.14415/konferencijaGFS2014.056 .

Radenković, Gligor, Kovačević, Saša, "Beam theory in spline parametric cooridinate. Part II: examples" in Međunarodna konferencija Savremena dostignuća u građevinarstvu 25, 30 (2014):411-415,
https://doi.org/10.14415/konferencijaGFS2014.056 . .

TY  - CONF
AU  - Koneski, Z.
AU  - Kostadinović Vranešević, Kristina
AU  - Kovačević, Saša
AU  - Lazić, Ž.
PY  - 2014
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1163
AB  - The review of the Reissner-Mindlin's (RM) theory of bending of rectangular plates is presented in this paper. Presented are the advantages and disadvantages of RM theory, its application and finite elements (FE) for solving plate bending by RM theory. The Wolfram Mathematica software package is used to create LESAP program code with built-in algorithm for calculation of the plate bending. The results for a given number of examples, which include accuracy, convergence and the speed of the solutions convergence, are compared with the results obtained using the software package ABAQUS.
PB  - Društvo građevinskih konstruktera Srbije, Beograd
C3  - Zbornik radova / DGKS Društvo građevinskih konstruktera Srbije, 14. kongres, Novi Sad, 24-26. oktobar, 2014.
T1  - The Effect of Transverse Shear Deformation on the Bending of Rectangular Plates
EP  - 214
SP  - 205
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1163
ER  - 

@conference{
author = "Koneski, Z. and Kostadinović Vranešević, Kristina and Kovačević, Saša and Lazić, Ž.",
year = "2014",
abstract = "The review of the Reissner-Mindlin's (RM) theory of bending of rectangular plates is presented in this paper. Presented are the advantages and disadvantages of RM theory, its application and finite elements (FE) for solving plate bending by RM theory. The Wolfram Mathematica software package is used to create LESAP program code with built-in algorithm for calculation of the plate bending. The results for a given number of examples, which include accuracy, convergence and the speed of the solutions convergence, are compared with the results obtained using the software package ABAQUS.",
publisher = "Društvo građevinskih konstruktera Srbije, Beograd",
journal = "Zbornik radova / DGKS Društvo građevinskih konstruktera Srbije, 14. kongres, Novi Sad, 24-26. oktobar, 2014.",
title = "The Effect of Transverse Shear Deformation on the Bending of Rectangular Plates",
pages = "214-205",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1163"
}

Koneski, Z., Kostadinović Vranešević, K., Kovačević, S.,& Lazić, Ž.. (2014). The Effect of Transverse Shear Deformation on the Bending of Rectangular Plates. in Zbornik radova / DGKS Društvo građevinskih konstruktera Srbije, 14. kongres, Novi Sad, 24-26. oktobar, 2014.
Društvo građevinskih konstruktera Srbije, Beograd., 205-214.
https://hdl.handle.net/21.15107/rcub_grafar_1163

Koneski Z, Kostadinović Vranešević K, Kovačević S, Lazić Ž. The Effect of Transverse Shear Deformation on the Bending of Rectangular Plates. in Zbornik radova / DGKS Društvo građevinskih konstruktera Srbije, 14. kongres, Novi Sad, 24-26. oktobar, 2014.. 2014;:205-214.
https://hdl.handle.net/21.15107/rcub_grafar_1163 .

Koneski, Z., Kostadinović Vranešević, Kristina, Kovačević, Saša, Lazić, Ž., "The Effect of Transverse Shear Deformation on the Bending of Rectangular Plates" in Zbornik radova / DGKS Društvo građevinskih konstruktera Srbije, 14. kongres, Novi Sad, 24-26. oktobar, 2014. (2014):205-214,
https://hdl.handle.net/21.15107/rcub_grafar_1163 .