TY  - CONF
AU  - Kostić, Svetlana M.
AU  - Deretic-Stojanovic, Biljana
PY  - 2019
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2128
AB  - The paper presents and compares four methods for visco-elastic analysis of steel-concrete composite beams. The method denoted as "exact" is based on the use of linear integro-differential operators and besides inevitable approximations of the rheological properties of constituent materials does not introduce other mathematical simplifications. The underlying assumption of the simplified method is that unknown deformations change linearly with the concrete creep function. In the paper, the results of the analysis of continuous composite beam obtained using the mentioned two methods are compared with results of widely used the Effective modulus method and its modified form proposed by Eurocode 4. Results have shown that the simplified method gives solutions closest to the “exact” analysis method.
PB  - Serbian Society of Mechanics
C3  - Proceedings / The 7th International Congress of Serbian Society of Mechanics, Sremski Karlovci, June 24-26, 2019
T1  - Comparison of different methods for viscoelastic analysis of composite beams
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2128
ER  - 

@conference{
author = "Kostić, Svetlana M. and Deretic-Stojanovic, Biljana",
year = "2019",
abstract = "The paper presents and compares four methods for visco-elastic analysis of steel-concrete composite beams. The method denoted as "exact" is based on the use of linear integro-differential operators and besides inevitable approximations of the rheological properties of constituent materials does not introduce other mathematical simplifications. The underlying assumption of the simplified method is that unknown deformations change linearly with the concrete creep function. In the paper, the results of the analysis of continuous composite beam obtained using the mentioned two methods are compared with results of widely used the Effective modulus method and its modified form proposed by Eurocode 4. Results have shown that the simplified method gives solutions closest to the “exact” analysis method.",
publisher = "Serbian Society of Mechanics",
journal = "Proceedings / The 7th International Congress of Serbian Society of Mechanics, Sremski Karlovci, June 24-26, 2019",
title = "Comparison of different methods for viscoelastic analysis of composite beams",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2128"
}

Kostić, S. M.,& Deretic-Stojanovic, B.. (2019). Comparison of different methods for viscoelastic analysis of composite beams. in Proceedings / The 7th International Congress of Serbian Society of Mechanics, Sremski Karlovci, June 24-26, 2019
Serbian Society of Mechanics..
https://hdl.handle.net/21.15107/rcub_grafar_2128

Kostić SM, Deretic-Stojanovic B. Comparison of different methods for viscoelastic analysis of composite beams. in Proceedings / The 7th International Congress of Serbian Society of Mechanics, Sremski Karlovci, June 24-26, 2019. 2019;.
https://hdl.handle.net/21.15107/rcub_grafar_2128 .

Kostić, Svetlana M., Deretic-Stojanovic, Biljana, "Comparison of different methods for viscoelastic analysis of composite beams" in Proceedings / The 7th International Congress of Serbian Society of Mechanics, Sremski Karlovci, June 24-26, 2019 (2019),
https://hdl.handle.net/21.15107/rcub_grafar_2128 .

TY  - CONF
AU  - Deretić-Stojanović, Biljana
AU  - Stošić, Saša
AU  - Kostić, Svetlana
PY  - 2013
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3008
AB  - The displacement method of frame analysis involves determination of the
element stiffness matrix. In the paper, the stiffness matrix of the fixed-end composite frame
element (type “k”) is derived. In general, the composite section consists of concrete part,
steel section, reinforcing and prestressing steel. Concrete is considered as an aging, linear
viscoelastic material. The relaxation of the prestressing steel is taken into account. The
derived expressions can be used with any creep function and, also, for elements with
variable cross-sections. The derivation of the element stiffness matrix follows two different
approaches. The first approach is based on the integral stress-strain relation for concrete.
The linear integral operators are used. In the second approach, the element flexibility matrix
and the resisting force vector are determined through the numerical integration of the cross-
section deformations. The class of cross-sections which accounts for viscous effects of a
composite section is developed. The results of the two approaches are compared in the
numerical example.
C3  - The 4th International Congress of Serbian Society of Mechanics, Vrnjacka Banja, Serbia, 4th June 2013
T1  - The Stiffness Matrix of the Fixed-End Composite Frame Element
UR  - https://hdl.handle.net/21.15107/rcub_grafar_3008
ER  - 

@conference{
author = "Deretić-Stojanović, Biljana and Stošić, Saša and Kostić, Svetlana",
year = "2013",
abstract = "The displacement method of frame analysis involves determination of the
element stiffness matrix. In the paper, the stiffness matrix of the fixed-end composite frame
element (type “k”) is derived. In general, the composite section consists of concrete part,
steel section, reinforcing and prestressing steel. Concrete is considered as an aging, linear
viscoelastic material. The relaxation of the prestressing steel is taken into account. The
derived expressions can be used with any creep function and, also, for elements with
variable cross-sections. The derivation of the element stiffness matrix follows two different
approaches. The first approach is based on the integral stress-strain relation for concrete.
The linear integral operators are used. In the second approach, the element flexibility matrix
and the resisting force vector are determined through the numerical integration of the cross-
section deformations. The class of cross-sections which accounts for viscous effects of a
composite section is developed. The results of the two approaches are compared in the
numerical example.",
journal = "The 4th International Congress of Serbian Society of Mechanics, Vrnjacka Banja, Serbia, 4th June 2013",
title = "The Stiffness Matrix of the Fixed-End Composite Frame Element",
url = "https://hdl.handle.net/21.15107/rcub_grafar_3008"
}

Deretić-Stojanović, B., Stošić, S.,& Kostić, S.. (2013). The Stiffness Matrix of the Fixed-End Composite Frame Element. in The 4th International Congress of Serbian Society of Mechanics, Vrnjacka Banja, Serbia, 4th June 2013.
https://hdl.handle.net/21.15107/rcub_grafar_3008

Deretić-Stojanović B, Stošić S, Kostić S. The Stiffness Matrix of the Fixed-End Composite Frame Element. in The 4th International Congress of Serbian Society of Mechanics, Vrnjacka Banja, Serbia, 4th June 2013. 2013;.
https://hdl.handle.net/21.15107/rcub_grafar_3008 .

Deretić-Stojanović, Biljana, Stošić, Saša, Kostić, Svetlana, "The Stiffness Matrix of the Fixed-End Composite Frame Element" in The 4th International Congress of Serbian Society of Mechanics, Vrnjacka Banja, Serbia, 4th June 2013 (2013),
https://hdl.handle.net/21.15107/rcub_grafar_3008 .

TY  - CONF
AU  - Deretić-Stojanović, Biljana
AU  - Kostić, Svetlana
AU  - Stošić, Saša
PY  - 2012
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3006
AB  - In the paper, the creep and shrinkage calculation methods for composite steel-concrete
beams are presented. The approximate methods AAEM, EM and methods according to
Eurocode 4, as well as, the exact method based on the integral relation between stress
and strain for concrete are used. For doubly-clamped composite beam, stresses at
characteristic points of the cross-section for permanent loading and shrinkage effects are
determined. Using the creep limit functions for concrete, the upper and lower limits for
stresses are determined. According to these limits, the accuracy of the methods for creep
and shrinkage calculation given in EC4 is evaluated.
C3  - 4th International Conference Civil Engineering Science and Practice, Zabljak, 20. 2. 2012
T1  - Accuracy Evaluation of Creep and Shrinkage Calculation Methods According to EC4
UR  - https://hdl.handle.net/21.15107/rcub_grafar_3006
ER  - 

@conference{
author = "Deretić-Stojanović, Biljana and Kostić, Svetlana and Stošić, Saša",
year = "2012",
abstract = "In the paper, the creep and shrinkage calculation methods for composite steel-concrete
beams are presented. The approximate methods AAEM, EM and methods according to
Eurocode 4, as well as, the exact method based on the integral relation between stress
and strain for concrete are used. For doubly-clamped composite beam, stresses at
characteristic points of the cross-section for permanent loading and shrinkage effects are
determined. Using the creep limit functions for concrete, the upper and lower limits for
stresses are determined. According to these limits, the accuracy of the methods for creep
and shrinkage calculation given in EC4 is evaluated.",
journal = "4th International Conference Civil Engineering Science and Practice, Zabljak, 20. 2. 2012",
title = "Accuracy Evaluation of Creep and Shrinkage Calculation Methods According to EC4",
url = "https://hdl.handle.net/21.15107/rcub_grafar_3006"
}

Deretić-Stojanović, B., Kostić, S.,& Stošić, S.. (2012). Accuracy Evaluation of Creep and Shrinkage Calculation Methods According to EC4. in 4th International Conference Civil Engineering Science and Practice, Zabljak, 20. 2. 2012.
https://hdl.handle.net/21.15107/rcub_grafar_3006

Deretić-Stojanović B, Kostić S, Stošić S. Accuracy Evaluation of Creep and Shrinkage Calculation Methods According to EC4. in 4th International Conference Civil Engineering Science and Practice, Zabljak, 20. 2. 2012. 2012;.
https://hdl.handle.net/21.15107/rcub_grafar_3006 .

Deretić-Stojanović, Biljana, Kostić, Svetlana, Stošić, Saša, "Accuracy Evaluation of Creep and Shrinkage Calculation Methods According to EC4" in 4th International Conference Civil Engineering Science and Practice, Zabljak, 20. 2. 2012 (2012),
https://hdl.handle.net/21.15107/rcub_grafar_3006 .

TY  - CONF
AU  - Deretić-Stojanović, Biljana
AU  - Kostić, Svetlana
AU  - Stošić, Saša
PY  - 2011
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3007
AB  - Design of the composite steel-concrete columns subjected to compression and bending, according to Eurocode
4, is shown in the paper. The effects of imperfections in the axial compression are taken into account
indirectly by using the relevant European buckling curves. When a composite column is subjected to
combined axial compression and bending, the analysis includes an increase in bending moment due to second
order effects. The verification of the column resistance to compression and bending is based on the use of
interaction curve. For the cross sections of fully encased columns with the I steel sections, very practical sets of
continuous interaction curves are given. The curves are constructed for different composite column dimensions,
steel sections and concrete classes.
C3  - Proceedings of the 14th International Symposium of MASE, Struga, Makedonija, 28. septembar 2018
T1  - Resistance of Composite Column to Compression and Bending
UR  - https://hdl.handle.net/21.15107/rcub_grafar_3007
ER  - 

@conference{
author = "Deretić-Stojanović, Biljana and Kostić, Svetlana and Stošić, Saša",
year = "2011",
abstract = "Design of the composite steel-concrete columns subjected to compression and bending, according to Eurocode
4, is shown in the paper. The effects of imperfections in the axial compression are taken into account
indirectly by using the relevant European buckling curves. When a composite column is subjected to
combined axial compression and bending, the analysis includes an increase in bending moment due to second
order effects. The verification of the column resistance to compression and bending is based on the use of
interaction curve. For the cross sections of fully encased columns with the I steel sections, very practical sets of
continuous interaction curves are given. The curves are constructed for different composite column dimensions,
steel sections and concrete classes.",
journal = "Proceedings of the 14th International Symposium of MASE, Struga, Makedonija, 28. septembar 2018",
title = "Resistance of Composite Column to Compression and Bending",
url = "https://hdl.handle.net/21.15107/rcub_grafar_3007"
}

Deretić-Stojanović, B., Kostić, S.,& Stošić, S.. (2011). Resistance of Composite Column to Compression and Bending. in Proceedings of the 14th International Symposium of MASE, Struga, Makedonija, 28. septembar 2018.
https://hdl.handle.net/21.15107/rcub_grafar_3007

Deretić-Stojanović B, Kostić S, Stošić S. Resistance of Composite Column to Compression and Bending. in Proceedings of the 14th International Symposium of MASE, Struga, Makedonija, 28. septembar 2018. 2011;.
https://hdl.handle.net/21.15107/rcub_grafar_3007 .

Deretić-Stojanović, Biljana, Kostić, Svetlana, Stošić, Saša, "Resistance of Composite Column to Compression and Bending" in Proceedings of the 14th International Symposium of MASE, Struga, Makedonija, 28. septembar 2018 (2011),
https://hdl.handle.net/21.15107/rcub_grafar_3007 .