TY  - CONF
AU  - Perović, Zoran
AU  - Šumarac, Dragoslav
AU  - Ćorić, Stanko
PY  - 2023
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3227
AB  - In this paper, a uniaxial material model with the ability to describe progressive damage growth, but also to provide a reliable estimation of fatigue life in the low-cycle regime of loading, is presented. The determination of damage in the material is based on two levels of modeling mechanical behavior. The element on the micro level establishes an elastoplastic damage model that depends on the maximum strain. The second level of modeling is defined by the connection of microelements with different values of total energy dissipated at failure. Hysteretic energy dissipated in heat during cyclic loading is determined for each micro element based on the analytical expression provided by a hysteretic operator. Different distributions of values of maximum dissipated energy can thus provide various fatigue damage evolution laws. The analytical expression for hysteretic energy loss for one element and its numerical implementation is enabled by the computational model whose parameters can be defined by monotonic and cyclic loading experimental tests. Validation of the introduced material model can additionally be concluded by constant and variable strain-controlled experiments, as well as with the comparison of constructed failure curves with existing methods for assessment of mean stress effect in fatigue analysis.
PB  - The Fourth International Conference on Damage Mechanics
PB  - Louisiana State University
C3  - The Fourth International Conference on Damage Mechanics (ICDM4) May 15-18, 2023, Louisiana State University, Baton Rouge, LA, US
T1  - Low-Cycle Fatigue Damage Model for Ductile Materials
UR  - https://hdl.handle.net/21.15107/rcub_grafar_3227
ER  - 

@conference{
author = "Perović, Zoran and Šumarac, Dragoslav and Ćorić, Stanko",
year = "2023",
abstract = "In this paper, a uniaxial material model with the ability to describe progressive damage growth, but also to provide a reliable estimation of fatigue life in the low-cycle regime of loading, is presented. The determination of damage in the material is based on two levels of modeling mechanical behavior. The element on the micro level establishes an elastoplastic damage model that depends on the maximum strain. The second level of modeling is defined by the connection of microelements with different values of total energy dissipated at failure. Hysteretic energy dissipated in heat during cyclic loading is determined for each micro element based on the analytical expression provided by a hysteretic operator. Different distributions of values of maximum dissipated energy can thus provide various fatigue damage evolution laws. The analytical expression for hysteretic energy loss for one element and its numerical implementation is enabled by the computational model whose parameters can be defined by monotonic and cyclic loading experimental tests. Validation of the introduced material model can additionally be concluded by constant and variable strain-controlled experiments, as well as with the comparison of constructed failure curves with existing methods for assessment of mean stress effect in fatigue analysis.",
publisher = "The Fourth International Conference on Damage Mechanics, Louisiana State University",
journal = "The Fourth International Conference on Damage Mechanics (ICDM4) May 15-18, 2023, Louisiana State University, Baton Rouge, LA, US",
title = "Low-Cycle Fatigue Damage Model for Ductile Materials",
url = "https://hdl.handle.net/21.15107/rcub_grafar_3227"
}

Perović, Z., Šumarac, D.,& Ćorić, S.. (2023). Low-Cycle Fatigue Damage Model for Ductile Materials. in The Fourth International Conference on Damage Mechanics (ICDM4) May 15-18, 2023, Louisiana State University, Baton Rouge, LA, US
The Fourth International Conference on Damage Mechanics..
https://hdl.handle.net/21.15107/rcub_grafar_3227

Perović Z, Šumarac D, Ćorić S. Low-Cycle Fatigue Damage Model for Ductile Materials. in The Fourth International Conference on Damage Mechanics (ICDM4) May 15-18, 2023, Louisiana State University, Baton Rouge, LA, US. 2023;.
https://hdl.handle.net/21.15107/rcub_grafar_3227 .

Perović, Zoran, Šumarac, Dragoslav, Ćorić, Stanko, "Low-Cycle Fatigue Damage Model for Ductile Materials" in The Fourth International Conference on Damage Mechanics (ICDM4) May 15-18, 2023, Louisiana State University, Baton Rouge, LA, US (2023),
https://hdl.handle.net/21.15107/rcub_grafar_3227 .

TY  - JOUR
AU  - Perović, Zoran
AU  - Ćorić, Stanko
AU  - Isaković, Snežana
AU  - Šumarac, Dragoslav
PY  - 2023
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3151
AB  - This paper considers the phenomenon of the instability of steel plane frame structures in the elastic-plastic domain. The numerical analysis uses FEM, where the corresponding stiffness matrices are based upon the trigonometric and hyperbolic interpolation functions of normal forces. The tangent modulus concept is applied when buckling occurs in the plastic range. Thus, the stiffness matrices for nonlinear material behavior are also derived. The procedure for determining effective length factors of compressed columns, which implies a global stability analysis of entire frames, is established too. It means that the proposed approach is based on the assumption that the collapse of the structure occurs when the most loaded columns reach their stability limit. So, the presented procedure enables the calculation of the real critical load of plane frame structures in the elastic-plastic domain and determines the corresponding effective length factors.
T2  - Applied Sciences, MDPI
T1  - Potential and benefit of green roof energy renovation of existing residential buildings with a flat roof in Belgrade
IS  - 13
IS  - 13
SP  - 7348
DO  - 10.3390/app13137348
ER  - 

@article{
author = "Perović, Zoran and Ćorić, Stanko and Isaković, Snežana and Šumarac, Dragoslav",
year = "2023",
abstract = "This paper considers the phenomenon of the instability of steel plane frame structures in the elastic-plastic domain. The numerical analysis uses FEM, where the corresponding stiffness matrices are based upon the trigonometric and hyperbolic interpolation functions of normal forces. The tangent modulus concept is applied when buckling occurs in the plastic range. Thus, the stiffness matrices for nonlinear material behavior are also derived. The procedure for determining effective length factors of compressed columns, which implies a global stability analysis of entire frames, is established too. It means that the proposed approach is based on the assumption that the collapse of the structure occurs when the most loaded columns reach their stability limit. So, the presented procedure enables the calculation of the real critical load of plane frame structures in the elastic-plastic domain and determines the corresponding effective length factors.",
journal = "Applied Sciences, MDPI",
title = "Potential and benefit of green roof energy renovation of existing residential buildings with a flat roof in Belgrade",
number = "13, 13",
pages = "7348",
doi = "10.3390/app13137348"
}

Perović, Z., Ćorić, S., Isaković, S.,& Šumarac, D.. (2023). Potential and benefit of green roof energy renovation of existing residential buildings with a flat roof in Belgrade. in Applied Sciences, MDPI(13), 7348.
https://doi.org/10.3390/app13137348

Perović Z, Ćorić S, Isaković S, Šumarac D. Potential and benefit of green roof energy renovation of existing residential buildings with a flat roof in Belgrade. in Applied Sciences, MDPI. 2023;(13):7348.
doi:10.3390/app13137348 .

Perović, Zoran, Ćorić, Stanko, Isaković, Snežana, Šumarac, Dragoslav, "Potential and benefit of green roof energy renovation of existing residential buildings with a flat roof in Belgrade" in Applied Sciences, MDPI, no. 13 (2023):7348,
https://doi.org/10.3390/app13137348 . .

TY  - CONF
AU  - Šumarac, Dragoslav
AU  - Đorđević, Filip
AU  - Matić, Dejan
AU  - Milutinović, Goran V.
PY  - 2021
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2684
AB  - Lead-rubber bearings are often used as isolation/dissipation devices in the bridge structures, as they provide both, period shift and increased damping in the structure, reducing significantly the seismic forces and displacements induced in the bridge. The hysteresis loop of the lead-rubber bearing, usually approximated with bilinear shape, is an important numerical parameter directly used in the analysis and design of this type of the structure. In this paper, an innovative rigorous and closed-form analytical solution of the lead-rubber bearing hysteresis loop was developed applying the Preisach model. This analytical model allows an accurate computation of all points on the hysteresis loop as well as its area.
C3  - 8th International Conference of Contemporary Achievements in Civil Engineering, Subotica, Serbia
T1  - A Preisach Model for The Lead-Rubber Bearing Hysteresis Loop
DO  - 10.14415/konferencijaGFS2021.25
ER  - 

@conference{
author = "Šumarac, Dragoslav and Đorđević, Filip and Matić, Dejan and Milutinović, Goran V.",
year = "2021",
abstract = "Lead-rubber bearings are often used as isolation/dissipation devices in the bridge structures, as they provide both, period shift and increased damping in the structure, reducing significantly the seismic forces and displacements induced in the bridge. The hysteresis loop of the lead-rubber bearing, usually approximated with bilinear shape, is an important numerical parameter directly used in the analysis and design of this type of the structure. In this paper, an innovative rigorous and closed-form analytical solution of the lead-rubber bearing hysteresis loop was developed applying the Preisach model. This analytical model allows an accurate computation of all points on the hysteresis loop as well as its area.",
journal = "8th International Conference of Contemporary Achievements in Civil Engineering, Subotica, Serbia",
title = "A Preisach Model for The Lead-Rubber Bearing Hysteresis Loop",
doi = "10.14415/konferencijaGFS2021.25"
}

Šumarac, D., Đorđević, F., Matić, D.,& Milutinović, G. V.. (2021). A Preisach Model for The Lead-Rubber Bearing Hysteresis Loop. in 8th International Conference of Contemporary Achievements in Civil Engineering, Subotica, Serbia.
https://doi.org/10.14415/konferencijaGFS2021.25

Šumarac D, Đorđević F, Matić D, Milutinović GV. A Preisach Model for The Lead-Rubber Bearing Hysteresis Loop. in 8th International Conference of Contemporary Achievements in Civil Engineering, Subotica, Serbia. 2021;.
doi:10.14415/konferencijaGFS2021.25 .

Šumarac, Dragoslav, Đorđević, Filip, Matić, Dejan, Milutinović, Goran V., "A Preisach Model for The Lead-Rubber Bearing Hysteresis Loop" in 8th International Conference of Contemporary Achievements in Civil Engineering, Subotica, Serbia (2021),
https://doi.org/10.14415/konferencijaGFS2021.25 . .

TY  - JOUR
AU  - Kovačević, Saša
AU  - Marković, Nenad
AU  - Šumarac, Dragoslav
AU  - Salatić, Ratko
PY  - 2021
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2269
AB  - Recent experimental studies have shown that the current EN1993-1-5 patch loading resistance model underestimates the ultimate strength of steel plate girders in certain cases, especially for longitudinally stiffened steel plate girders and longer patch load lengths. In addition to this resistance model, the design standard allows the use of finite element analysis for the ultimate limit state. The existing design recommendations for an adequate ultimate limit state design are found insufficient. In the current paper, the imperfection sensitivity analysis of steel plate girders subjected to patch loading is performed. The paper presents a nonlinear finite element parametric study designed to determine the influence of a variety of geometric imperfections on the patch load resistance of longitudinally unstiffened and stiffened steel plate girders. 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.

The ultimate strength of longitudinally unstiffened and stiffened steel plate girders increases as the patch load length is increased for all the geometric imperfections considered. For relatively small patch load lengths, the relative stiffness of the longitudinal stiffener has no significant influence on the ultimate load regardless of the geometric imperfection. For longer patch load lengths, the ultimate strength is highly dependent on geometric imperfections. The influence of the web panel aspect ratio is shown to be negligible for smaller patch load lengths regardless of the geometric imperfection, while for longer applied loads, the impact of this ratio is dependent on the geometric imperfection.

Unfavorable geometric imperfections in steel plate girders subjected to patch 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 patch load resistances were returned for geometric imperfections that resembled the deformation at collapse (collapse-affine geometric imperfections). Although the concept of collapse-affine geometric imperfections seems impractical for design purposes (a geometrically and materially nonlinear analysis must be conducted before collapse-affine geometric imperfection shapes are determined), the use of these imperfection shapes is recommended.
PB  - Elsevier
T2  - Thin-Walled Structures
T1  - Unfavorable geometric imperfections in steel plate girders subjected to localized loads
VL  - 161
DO  - 10.1016/j.tws.2020.107412
ER  - 

@article{
author = "Kovačević, Saša and Marković, Nenad and Šumarac, Dragoslav and Salatić, Ratko",
year = "2021",
abstract = "Recent experimental studies have shown that the current EN1993-1-5 patch loading resistance model underestimates the ultimate strength of steel plate girders in certain cases, especially for longitudinally stiffened steel plate girders and longer patch load lengths. In addition to this resistance model, the design standard allows the use of finite element analysis for the ultimate limit state. The existing design recommendations for an adequate ultimate limit state design are found insufficient. In the current paper, the imperfection sensitivity analysis of steel plate girders subjected to patch loading is performed. The paper presents a nonlinear finite element parametric study designed to determine the influence of a variety of geometric imperfections on the patch load resistance of longitudinally unstiffened and stiffened steel plate girders. 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.

The ultimate strength of longitudinally unstiffened and stiffened steel plate girders increases as the patch load length is increased for all the geometric imperfections considered. For relatively small patch load lengths, the relative stiffness of the longitudinal stiffener has no significant influence on the ultimate load regardless of the geometric imperfection. For longer patch load lengths, the ultimate strength is highly dependent on geometric imperfections. The influence of the web panel aspect ratio is shown to be negligible for smaller patch load lengths regardless of the geometric imperfection, while for longer applied loads, the impact of this ratio is dependent on the geometric imperfection.

Unfavorable geometric imperfections in steel plate girders subjected to patch 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 patch load resistances were returned for geometric imperfections that resembled the deformation at collapse (collapse-affine geometric imperfections). Although the concept of collapse-affine geometric imperfections seems impractical for design purposes (a geometrically and materially nonlinear analysis must be conducted before collapse-affine geometric imperfection shapes are determined), the use of these imperfection shapes is recommended.",
publisher = "Elsevier",
journal = "Thin-Walled Structures",
title = "Unfavorable geometric imperfections in steel plate girders subjected to localized loads",
volume = "161",
doi = "10.1016/j.tws.2020.107412"
}

Kovačević, S., Marković, N., Šumarac, D.,& Salatić, R.. (2021). Unfavorable geometric imperfections in steel plate girders subjected to localized loads. in Thin-Walled Structures
Elsevier., 161.
https://doi.org/10.1016/j.tws.2020.107412

Kovačević S, Marković N, Šumarac D, Salatić R. Unfavorable geometric imperfections in steel plate girders subjected to localized loads. in Thin-Walled Structures. 2021;161.
doi:10.1016/j.tws.2020.107412 .

Kovačević, Saša, Marković, Nenad, Šumarac, Dragoslav, Salatić, Ratko, "Unfavorable geometric imperfections in steel plate girders subjected to localized loads" in Thin-Walled Structures, 161 (2021),
https://doi.org/10.1016/j.tws.2020.107412 . .

TY  - CONF
AU  - Milekić, Nemanja
AU  - Ćorić, Stanko
AU  - Perović, Zoran
AU  - Šumarac, Dragoslav
PY  - 2021
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2556
AB  - Green energy has become an essential piece of any sustainable development 
analysis. Furthermore, renewable energy must be recognized as an area with the greatest 
potential for reducing the overall pollution in the Republic of Serbia. The goal of this 
paper is to show the benefits of the investment in solar energy use and to determine the 
economic justification of the photovoltaic system implementation on the roof of houses in 
the AP of Vojvodina.
PB  - Građevinski fakultet Subotica
C3  - http://www.gf.uns.ac.rs/~zbornik/doc/NS2021.12.pdf
T1  - The analysis of the photovoltaic system investment profitability in Vojvodina
DO  - 10.14415/konferencijaGFS2021.12
ER  - 

@conference{
author = "Milekić, Nemanja and Ćorić, Stanko and Perović, Zoran and Šumarac, Dragoslav",
year = "2021",
abstract = "Green energy has become an essential piece of any sustainable development 
analysis. Furthermore, renewable energy must be recognized as an area with the greatest 
potential for reducing the overall pollution in the Republic of Serbia. The goal of this 
paper is to show the benefits of the investment in solar energy use and to determine the 
economic justification of the photovoltaic system implementation on the roof of houses in 
the AP of Vojvodina.",
publisher = "Građevinski fakultet Subotica",
journal = "http://www.gf.uns.ac.rs/~zbornik/doc/NS2021.12.pdf",
title = "The analysis of the photovoltaic system investment profitability in Vojvodina",
doi = "10.14415/konferencijaGFS2021.12"
}

Milekić, N., Ćorić, S., Perović, Z.,& Šumarac, D.. (2021). The analysis of the photovoltaic system investment profitability in Vojvodina. in http://www.gf.uns.ac.rs/~zbornik/doc/NS2021.12.pdf
Građevinski fakultet Subotica..
https://doi.org/10.14415/konferencijaGFS2021.12

Milekić N, Ćorić S, Perović Z, Šumarac D. The analysis of the photovoltaic system investment profitability in Vojvodina. in http://www.gf.uns.ac.rs/~zbornik/doc/NS2021.12.pdf. 2021;.
doi:10.14415/konferencijaGFS2021.12 .

Milekić, Nemanja, Ćorić, Stanko, Perović, Zoran, Šumarac, Dragoslav, "The analysis of the photovoltaic system investment profitability in Vojvodina" in http://www.gf.uns.ac.rs/~zbornik/doc/NS2021.12.pdf (2021),
https://doi.org/10.14415/konferencijaGFS2021.12 . .

TY  - CONF
AU  - Šumarac, Dragoslav
AU  - Božović, Nikola
AU  - Krstić, Marija
AU  - Mitrović, Stefan M.
PY  - 2021
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2594
AB  - Mathematical modeling of engineering materials is important issue in design 
of structures. Model itself should satisfy two conditions: first to explain in the best way 
mechanical behavior of material and second to be as simple as possible for easy everyday 
application in engineering. In the present paper the Preisach model is applied to 
behaviour of clay as an elasto-plastic material under direct shear test. The clay sample 
was taken by exploratory drilling on the territory of Šimanovci from a depth of 9.1 m to 
9.3 m. First, an experimental examination of a clay sample was performed in order to 
classify and determine the resistance-deformable characteristics. The clay is classified as 
CH-clay of high plasticity. The sample was then subjected to direct shear test. All obtained 
results clearly show advantages of the Preisach model for describing behavior of elasto plastic material. This analytical model allows an accurate computation of all points on 
the result curve from the direct shear test.
C3  - Zbornik radova 8. međunarodne konferencije savremena dostignuća u građevinarstvu 2021.
T1  - Preisach model used to describe response of clay in direct shear test
DO  - 10.14415/konferencijaGFS2021.26
ER  - 

@conference{
author = "Šumarac, Dragoslav and Božović, Nikola and Krstić, Marija and Mitrović, Stefan M.",
year = "2021",
abstract = "Mathematical modeling of engineering materials is important issue in design 
of structures. Model itself should satisfy two conditions: first to explain in the best way 
mechanical behavior of material and second to be as simple as possible for easy everyday 
application in engineering. In the present paper the Preisach model is applied to 
behaviour of clay as an elasto-plastic material under direct shear test. The clay sample 
was taken by exploratory drilling on the territory of Šimanovci from a depth of 9.1 m to 
9.3 m. First, an experimental examination of a clay sample was performed in order to 
classify and determine the resistance-deformable characteristics. The clay is classified as 
CH-clay of high plasticity. The sample was then subjected to direct shear test. All obtained 
results clearly show advantages of the Preisach model for describing behavior of elasto plastic material. This analytical model allows an accurate computation of all points on 
the result curve from the direct shear test.",
journal = "Zbornik radova 8. međunarodne konferencije savremena dostignuća u građevinarstvu 2021.",
title = "Preisach model used to describe response of clay in direct shear test",
doi = "10.14415/konferencijaGFS2021.26"
}

Šumarac, D., Božović, N., Krstić, M.,& Mitrović, S. M.. (2021). Preisach model used to describe response of clay in direct shear test. in Zbornik radova 8. međunarodne konferencije savremena dostignuća u građevinarstvu 2021..
https://doi.org/10.14415/konferencijaGFS2021.26

Šumarac D, Božović N, Krstić M, Mitrović SM. Preisach model used to describe response of clay in direct shear test. in Zbornik radova 8. međunarodne konferencije savremena dostignuća u građevinarstvu 2021.. 2021;.
doi:10.14415/konferencijaGFS2021.26 .

Šumarac, Dragoslav, Božović, Nikola, Krstić, Marija, Mitrović, Stefan M., "Preisach model used to describe response of clay in direct shear test" in Zbornik radova 8. međunarodne konferencije savremena dostignuća u građevinarstvu 2021. (2021),
https://doi.org/10.14415/konferencijaGFS2021.26 . .

TY  - CONF
AU  - Perović, Zoran
AU  - Šumarac, Dragoslav
PY  - 2021
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2601
AB  - In this paper, hysteretic energy loss in cyclic loading is used as the main parameter in fatigue 
damage modeling. The analytical expression for hysteretic energy loss and its numerical 
implementation are features of the powerful hysteretic operator that has the ability to model 
progressive damage growth based on the maximum strain amplitude. Its scalar damage parameter 
is further modified in order to produce a reliable estimation of fatigue life under arbitrary loading.
PB  - Serbian Society of Mechanics
C3  - 8th International Congress of Serbian Society of Mechanics
T1  - Low-cycle fatigue damage modeling with hysteretic energy loss
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2601
ER  - 

@conference{
author = "Perović, Zoran and Šumarac, Dragoslav",
year = "2021",
abstract = "In this paper, hysteretic energy loss in cyclic loading is used as the main parameter in fatigue 
damage modeling. The analytical expression for hysteretic energy loss and its numerical 
implementation are features of the powerful hysteretic operator that has the ability to model 
progressive damage growth based on the maximum strain amplitude. Its scalar damage parameter 
is further modified in order to produce a reliable estimation of fatigue life under arbitrary loading.",
publisher = "Serbian Society of Mechanics",
journal = "8th International Congress of Serbian Society of Mechanics",
title = "Low-cycle fatigue damage modeling with hysteretic energy loss",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2601"
}

Perović, Z.,& Šumarac, D.. (2021). Low-cycle fatigue damage modeling with hysteretic energy loss. in 8th International Congress of Serbian Society of Mechanics
Serbian Society of Mechanics..
https://hdl.handle.net/21.15107/rcub_grafar_2601

Perović Z, Šumarac D. Low-cycle fatigue damage modeling with hysteretic energy loss. in 8th International Congress of Serbian Society of Mechanics. 2021;.
https://hdl.handle.net/21.15107/rcub_grafar_2601 .

Perović, Zoran, Šumarac, Dragoslav, "Low-cycle fatigue damage modeling with hysteretic energy loss" in 8th International Congress of Serbian Society of Mechanics (2021),
https://hdl.handle.net/21.15107/rcub_grafar_2601 .

TY  - JOUR
AU  - Knežević, Petar
AU  - Šumarac, Dragoslav
AU  - Perović, Zoran
AU  - Dolićanin, Ćemal
AU  - Burzić, Zijah
PY  - 2020
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2134
AB  - This paper presents the new type of Preisach model that describes the elastoplastic behavior of structural mild steel under axial monotonic tension load with damage. Newly developed model takes into account elastic region, horizontal yield plateau, plastic hardening region, and softening region due to material damage under tension. In order to study the monotonic behavior of structural mild steel and find suitable material properties for the model, monotonic axial tensile tests up to the failure are carried out. Tests are conducted on specimens of the three most common types of European structural steel S235, S275, and S355. The basis of the model represents a mathematical description of material single crystal monotonic axial behavior. In the multilinear mechanical model, a drop in stress, after achieving ultimate stress under tension is achieved by a negative stiffness element. The good agreement with experimental results is accomplished by parallel connection of infinitely many single crystal elements, forming the polycrystalline model. The model represents a good solution for common engineering practice due to its geometrical representation in form of Preisach triangle.
PB  - Budapest University of Technology and Economics
T2  - Periodica Polytechnica Civil Engineering
T1  - A Preisach Model for Monotonic Tension Response of Structural Mild Steel with Damage
EP  - 303
IS  - 1
SP  - 296
VL  - 64
DO  - 10.3311/PPci.14809
ER  - 

@article{
author = "Knežević, Petar and Šumarac, Dragoslav and Perović, Zoran and Dolićanin, Ćemal and Burzić, Zijah",
year = "2020",
abstract = "This paper presents the new type of Preisach model that describes the elastoplastic behavior of structural mild steel under axial monotonic tension load with damage. Newly developed model takes into account elastic region, horizontal yield plateau, plastic hardening region, and softening region due to material damage under tension. In order to study the monotonic behavior of structural mild steel and find suitable material properties for the model, monotonic axial tensile tests up to the failure are carried out. Tests are conducted on specimens of the three most common types of European structural steel S235, S275, and S355. The basis of the model represents a mathematical description of material single crystal monotonic axial behavior. In the multilinear mechanical model, a drop in stress, after achieving ultimate stress under tension is achieved by a negative stiffness element. The good agreement with experimental results is accomplished by parallel connection of infinitely many single crystal elements, forming the polycrystalline model. The model represents a good solution for common engineering practice due to its geometrical representation in form of Preisach triangle.",
publisher = "Budapest University of Technology and Economics",
journal = "Periodica Polytechnica Civil Engineering",
title = "A Preisach Model for Monotonic Tension Response of Structural Mild Steel with Damage",
pages = "303-296",
number = "1",
volume = "64",
doi = "10.3311/PPci.14809"
}

Knežević, P., Šumarac, D., Perović, Z., Dolićanin, Ć.,& Burzić, Z.. (2020). A Preisach Model for Monotonic Tension Response of Structural Mild Steel with Damage. in Periodica Polytechnica Civil Engineering
Budapest University of Technology and Economics., 64(1), 296-303.
https://doi.org/10.3311/PPci.14809

Knežević P, Šumarac D, Perović Z, Dolićanin Ć, Burzić Z. A Preisach Model for Monotonic Tension Response of Structural Mild Steel with Damage. in Periodica Polytechnica Civil Engineering. 2020;64(1):296-303.
doi:10.3311/PPci.14809 .

Knežević, Petar, Šumarac, Dragoslav, Perović, Zoran, Dolićanin, Ćemal, Burzić, Zijah, "A Preisach Model for Monotonic Tension Response of Structural Mild Steel with Damage" in Periodica Polytechnica Civil Engineering, 64, no. 1 (2020):296-303,
https://doi.org/10.3311/PPci.14809 . .

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  - CONF
AU  - Isaković, Snežana
AU  - Perović, Zoran
AU  - Ćorić, Stanko
AU  - Šumarac, Dragoslav
PY  - 2019
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2854
AB  - Improving the energy efficiency in buildings in the Republic of Serbia has been recognized as an area with the greatest potential for reducing overall energy consumption. It also has an indirect impact on improving the quality of life and comfort in buildings, protecting the environment and reducing the emission of harmful gases, as well as reducing the cost of heating. Permanent population increase resulted in the urbanization process that had different consequences for the quality of life and a sustainable future. Green roofs in urban areas of developed countries have become a legal obligation and policies and programs that support the greening of roofs are aimed at preserving the environment and ensuring the sustainable development of cities. This paper deals with an analysis of the influence of green roofs on the energy performance of existing buildings in the center of Belgrade. One of the conclusions of this research points out that it is necessary to perform research studies and experimental analyses for the application of green roofs in our climatic conditions. Thus, the research focus should be on legal regulation that would establish calculation and design standards for green roof systems.
PB  - Faculty Of Civil Engineering Subotica
C3  - 7th International Conference Contemporary Achievements in Civil Engineering
T1  - Enhancing energy efficiency by application of green roof in residential building
EP  - 484
SP  - 475
DO  - 10.14415/konferencijaGFS2019.042
ER  - 

@conference{
author = "Isaković, Snežana and Perović, Zoran and Ćorić, Stanko and Šumarac, Dragoslav",
year = "2019",
abstract = "Improving the energy efficiency in buildings in the Republic of Serbia has been recognized as an area with the greatest potential for reducing overall energy consumption. It also has an indirect impact on improving the quality of life and comfort in buildings, protecting the environment and reducing the emission of harmful gases, as well as reducing the cost of heating. Permanent population increase resulted in the urbanization process that had different consequences for the quality of life and a sustainable future. Green roofs in urban areas of developed countries have become a legal obligation and policies and programs that support the greening of roofs are aimed at preserving the environment and ensuring the sustainable development of cities. This paper deals with an analysis of the influence of green roofs on the energy performance of existing buildings in the center of Belgrade. One of the conclusions of this research points out that it is necessary to perform research studies and experimental analyses for the application of green roofs in our climatic conditions. Thus, the research focus should be on legal regulation that would establish calculation and design standards for green roof systems.",
publisher = "Faculty Of Civil Engineering Subotica",
journal = "7th International Conference Contemporary Achievements in Civil Engineering",
title = "Enhancing energy efficiency by application of green roof in residential building",
pages = "484-475",
doi = "10.14415/konferencijaGFS2019.042"
}

Isaković, S., Perović, Z., Ćorić, S.,& Šumarac, D.. (2019). Enhancing energy efficiency by application of green roof in residential building. in 7th International Conference Contemporary Achievements in Civil Engineering
Faculty Of Civil Engineering Subotica., 475-484.
https://doi.org/10.14415/konferencijaGFS2019.042

Isaković S, Perović Z, Ćorić S, Šumarac D. Enhancing energy efficiency by application of green roof in residential building. in 7th International Conference Contemporary Achievements in Civil Engineering. 2019;:475-484.
doi:10.14415/konferencijaGFS2019.042 .

Isaković, Snežana, Perović, Zoran, Ćorić, Stanko, Šumarac, Dragoslav, "Enhancing energy efficiency by application of green roof in residential building" in 7th International Conference Contemporary Achievements in Civil Engineering (2019):475-484,
https://doi.org/10.14415/konferencijaGFS2019.042 . .

TY  - CONF
AU  - Šumarac, Dragoslav
AU  - Perović, Zoran
AU  - Ćorić, Stanko
AU  - Isaković, Snežana
PY  - 2019
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2869
AB  - This paper presents the analysis of the potential use of green roofs to enhance the energy efficiency of the residential buildings. Namely, in urban areas, there is a lot of potential for reducing the energy needed for heating and cooling in the existing buildings. Thus, in developed countries, green roofs are recognized as one of the important tools for energy savings, but also in accomplishing environmental protection and raising the quality of life. Current regulation in the Republic of Serbia does not adequately demonstrate the effects of contemporary measures of energy efficiency improvement in buildings. This paper provides an analysis of the possible improvement of energy efficiency by various green roof application models. The aim of this investigation is to generate affirmation of the green roof projects by pointing out the financial benefits and other implications that are significant for sustainable development. The existing building in the center of Belgrade with a flat roof is used as the model for parametric analysis. The key indicator of the investment profitability in this investigation was the energy needed for heating and cooling. Besides the economic impact, other aspects of green roof application are highlighted as well. Numerical analysis is performed for the apartment under a flat roof for three different models of renovation. The values of the reduction of the annual energy need for heating and cooling are compared. The economic profitability analysis considered the life cycle profit analysis for all analyzed cases. The obtained results indicate the benefits of using green roofs at both, the individual and the public levels.
PB  - Serbian Union of Mechanical and Electrical Engineering (SMEITS)
C3  - 50. International HVAC&R congress
T1  - Application of green roof for increasing the energy efficiency of the existing building in Belgrade
EP  - 351
SP  - 347
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2869
ER  - 

@conference{
author = "Šumarac, Dragoslav and Perović, Zoran and Ćorić, Stanko and Isaković, Snežana",
year = "2019",
abstract = "This paper presents the analysis of the potential use of green roofs to enhance the energy efficiency of the residential buildings. Namely, in urban areas, there is a lot of potential for reducing the energy needed for heating and cooling in the existing buildings. Thus, in developed countries, green roofs are recognized as one of the important tools for energy savings, but also in accomplishing environmental protection and raising the quality of life. Current regulation in the Republic of Serbia does not adequately demonstrate the effects of contemporary measures of energy efficiency improvement in buildings. This paper provides an analysis of the possible improvement of energy efficiency by various green roof application models. The aim of this investigation is to generate affirmation of the green roof projects by pointing out the financial benefits and other implications that are significant for sustainable development. The existing building in the center of Belgrade with a flat roof is used as the model for parametric analysis. The key indicator of the investment profitability in this investigation was the energy needed for heating and cooling. Besides the economic impact, other aspects of green roof application are highlighted as well. Numerical analysis is performed for the apartment under a flat roof for three different models of renovation. The values of the reduction of the annual energy need for heating and cooling are compared. The economic profitability analysis considered the life cycle profit analysis for all analyzed cases. The obtained results indicate the benefits of using green roofs at both, the individual and the public levels.",
publisher = "Serbian Union of Mechanical and Electrical Engineering (SMEITS)",
journal = "50. International HVAC&R congress",
title = "Application of green roof for increasing the energy efficiency of the existing building in Belgrade",
pages = "351-347",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2869"
}

Šumarac, D., Perović, Z., Ćorić, S.,& Isaković, S.. (2019). Application of green roof for increasing the energy efficiency of the existing building in Belgrade. in 50. International HVAC&R congress
Serbian Union of Mechanical and Electrical Engineering (SMEITS)., 347-351.
https://hdl.handle.net/21.15107/rcub_grafar_2869

Šumarac D, Perović Z, Ćorić S, Isaković S. Application of green roof for increasing the energy efficiency of the existing building in Belgrade. in 50. International HVAC&R congress. 2019;:347-351.
https://hdl.handle.net/21.15107/rcub_grafar_2869 .

Šumarac, Dragoslav, Perović, Zoran, Ćorić, Stanko, Isaković, Snežana, "Application of green roof for increasing the energy efficiency of the existing building in Belgrade" in 50. International HVAC&R congress (2019):347-351,
https://hdl.handle.net/21.15107/rcub_grafar_2869 .

TY  - CONF
AU  - Kekanović, Milan
AU  - Šumarac, Dragoslav
AU  - Kozarić, Ljiljana
AU  - Ćorić, Stanko
AU  - Čeh, Arpad
PY  - 2019
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2853
AB  - The paper contains the authors’ experiences and findings that were yielded as a result of measurements of the thermodynamic properties of traditional renewable materials. As a testament to the quality of existing traditional constructions and construction techniques that are already scattered around the world, we have only grown stronger in our decision to completely dedicate ourselves to the development of new construction systems with the application of traditional materials in their original or partially altered form. To digress a little, climate changes have already resulted in short summer heat waves in Europe and the world. Artificial air conditioners are not a proper solution for the protection of people in housing objects. The only correct and plausible solution is for the walls to provide air-conditioning of the inner space and also the protection of the people which would be done in a completely natural way in accordance with the thermodynamic laws of water vapor exchange which in turn would provide cooling of the walls.
PB  - Faculty Of Civil Engineering Subotica
C3  - 7th International Conference Contemporary Achievements in Civil  Engineering
T1  - Traditional materials as a solution to construction in the new age of climate distrubances
EP  - 585
SP  - 575
DO  - 10.14415/konferencijaGFS2019.053
ER  - 

@conference{
author = "Kekanović, Milan and Šumarac, Dragoslav and Kozarić, Ljiljana and Ćorić, Stanko and Čeh, Arpad",
year = "2019",
abstract = "The paper contains the authors’ experiences and findings that were yielded as a result of measurements of the thermodynamic properties of traditional renewable materials. As a testament to the quality of existing traditional constructions and construction techniques that are already scattered around the world, we have only grown stronger in our decision to completely dedicate ourselves to the development of new construction systems with the application of traditional materials in their original or partially altered form. To digress a little, climate changes have already resulted in short summer heat waves in Europe and the world. Artificial air conditioners are not a proper solution for the protection of people in housing objects. The only correct and plausible solution is for the walls to provide air-conditioning of the inner space and also the protection of the people which would be done in a completely natural way in accordance with the thermodynamic laws of water vapor exchange which in turn would provide cooling of the walls.",
publisher = "Faculty Of Civil Engineering Subotica",
journal = "7th International Conference Contemporary Achievements in Civil  Engineering",
title = "Traditional materials as a solution to construction in the new age of climate distrubances",
pages = "585-575",
doi = "10.14415/konferencijaGFS2019.053"
}

Kekanović, M., Šumarac, D., Kozarić, L., Ćorić, S.,& Čeh, A.. (2019). Traditional materials as a solution to construction in the new age of climate distrubances. in 7th International Conference Contemporary Achievements in Civil  Engineering
Faculty Of Civil Engineering Subotica., 575-585.
https://doi.org/10.14415/konferencijaGFS2019.053

Kekanović M, Šumarac D, Kozarić L, Ćorić S, Čeh A. Traditional materials as a solution to construction in the new age of climate distrubances. in 7th International Conference Contemporary Achievements in Civil  Engineering. 2019;:575-585.
doi:10.14415/konferencijaGFS2019.053 .

Kekanović, Milan, Šumarac, Dragoslav, Kozarić, Ljiljana, Ćorić, Stanko, Čeh, Arpad, "Traditional materials as a solution to construction in the new age of climate distrubances" in 7th International Conference Contemporary Achievements in Civil  Engineering (2019):575-585,
https://doi.org/10.14415/konferencijaGFS2019.053 . .

TY  - CONF
AU  - Kekanović, Milan
AU  - Šumarac, Dragoslav
AU  - Ćorić, Stanko
AU  - Kasaš, Karolj
AU  - Čeh, Arpad
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1616
AB  - This article provides information about the possibilities and technologies [2] available for the building industry in the Republic of Serbia, and concerns the trends - which expansion is expected in Europe and worldwide - the of use of renewable sources of building materials. Exploitation of sand and gravel from rivers and dry mines in many EU countries is prohibited. Excavation of clay from clay deposits and blasting the rock mass are considered as a violation of the natural environment and resulting with scars on our planet Earth.Renewable sources of construction materials are considered materials which each year can be renewed and which are the most common by-product of agricultural production.Materials obtained by recycling existing materials already used in construction, as well as by-products of industrial production are also considered sustainable materials.Renewable materials are supporting the new, worldwide trend in building industry, called "Green Building" with the aim of reducing harmful CO2 emissions.This paper will discuss renewable materials obtained as a by-product of agricultural production such as grain straw (wheat, barley, rye and oats), cane and hemp shiv obtained by mechanical breakingof hemp stems.These materials are cheap because they are by-products and they are energy efficient, which is particularly important nowadays.The construction of buildings with the above mentioned materials should be well planned to ensure the durability, fire resistance and particularly the pleasant and comfortable stay for the people.The walls made of this material must be solved, and ensured to avoid occurrence of rodents and other pests that may be carriers of dangerous and contagious diseases.
PB  - Građevinski fakultet, Subotica
C3  - Zbornik radova Građevinskog fakulteta
T1  - Renewable building materials for high energy efficiency construction era
T1  - Obnovljivi izvori građevinskih materijala za novo vreme građenja objekata visoke energetske efikasnosti
EP  - 322
SP  - 313
VL  - 34
DO  - 10.14415/konferencijaGFS2018.031
ER  - 

@conference{
author = "Kekanović, Milan and Šumarac, Dragoslav and Ćorić, Stanko and Kasaš, Karolj and Čeh, Arpad",
year = "2018",
abstract = "This article provides information about the possibilities and technologies [2] available for the building industry in the Republic of Serbia, and concerns the trends - which expansion is expected in Europe and worldwide - the of use of renewable sources of building materials. Exploitation of sand and gravel from rivers and dry mines in many EU countries is prohibited. Excavation of clay from clay deposits and blasting the rock mass are considered as a violation of the natural environment and resulting with scars on our planet Earth.Renewable sources of construction materials are considered materials which each year can be renewed and which are the most common by-product of agricultural production.Materials obtained by recycling existing materials already used in construction, as well as by-products of industrial production are also considered sustainable materials.Renewable materials are supporting the new, worldwide trend in building industry, called "Green Building" with the aim of reducing harmful CO2 emissions.This paper will discuss renewable materials obtained as a by-product of agricultural production such as grain straw (wheat, barley, rye and oats), cane and hemp shiv obtained by mechanical breakingof hemp stems.These materials are cheap because they are by-products and they are energy efficient, which is particularly important nowadays.The construction of buildings with the above mentioned materials should be well planned to ensure the durability, fire resistance and particularly the pleasant and comfortable stay for the people.The walls made of this material must be solved, and ensured to avoid occurrence of rodents and other pests that may be carriers of dangerous and contagious diseases.",
publisher = "Građevinski fakultet, Subotica",
journal = "Zbornik radova Građevinskog fakulteta",
title = "Renewable building materials for high energy efficiency construction era, Obnovljivi izvori građevinskih materijala za novo vreme građenja objekata visoke energetske efikasnosti",
pages = "322-313",
volume = "34",
doi = "10.14415/konferencijaGFS2018.031"
}

Kekanović, M., Šumarac, D., Ćorić, S., Kasaš, K.,& Čeh, A.. (2018). Renewable building materials for high energy efficiency construction era. in Zbornik radova Građevinskog fakulteta
Građevinski fakultet, Subotica., 34, 313-322.
https://doi.org/10.14415/konferencijaGFS2018.031

Kekanović M, Šumarac D, Ćorić S, Kasaš K, Čeh A. Renewable building materials for high energy efficiency construction era. in Zbornik radova Građevinskog fakulteta. 2018;34:313-322.
doi:10.14415/konferencijaGFS2018.031 .

Kekanović, Milan, Šumarac, Dragoslav, Ćorić, Stanko, Kasaš, Karolj, Čeh, Arpad, "Renewable building materials for high energy efficiency construction era" in Zbornik radova Građevinskog fakulteta, 34 (2018):313-322,
https://doi.org/10.14415/konferencijaGFS2018.031 . .

TY  - JOUR
AU  - Šekularac, Nenad D.
AU  - Šumarac, Dragoslav
AU  - Tovarović-Cikic, Jasna Lj.
AU  - Čokić, Miloš
AU  - Ivanović-Šekularac, Jelena A.
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/977
AB  - This paper analyses the possibility to apply energy refurbishment measures in restored historic buildings in order to ensure reuse. The objective of the paper is to provide an appropriate methodology for the structural restoration of historic buildings, their re-use and sustainable energy refurbishment in accordance with current needs and conservation principles. The study provides the analysis and evaluation of the realized goals regarding energy refurbishment and energy efficiency. The presented historic buildings belong to Hilandar Monastery, Mount Athos, Greece. Mount Athos has been listed in UNESCO World Heritage Site for decades. The paper deals with the expert analysis of abandoned and devastated structures included in the Haybarn Complex. This paper provides a positive outcome of the performed restoration in terms of energy refurbishment and repurpose, since these buildings were turned into unique accommodation facilities for visitors. This accomplishment can be seen as a useful recommendation for improving energy efficiency of historic buildings during their restoration. All the undertaken methods are in accordance with the environmental protection requirements. This study is a practical observation and analysis of energy refurbishment in the field of restoration of listed buildings. This certainly is the most important contribution of this paper. All energy efficiency measures and renewable energy sources were carried out in compliance with conservation requirements and visual authenticity of historic structures. Assessment and analysis of energy efficient refurbishment via building performance simulation method and energy efficiency optimization was applied to several different models of restoration that was carried out in the Haybarn Complex.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Re-use of historic buildings and energy refurbishment analysis via building performance simulation a case study
EP  - 2354
IS  - 6
SP  - 2335
VL  - 22
DO  - 10.2298/TSCI171124089S
ER  - 

@article{
author = "Šekularac, Nenad D. and Šumarac, Dragoslav and Tovarović-Cikic, Jasna Lj. and Čokić, Miloš and Ivanović-Šekularac, Jelena A.",
year = "2018",
abstract = "This paper analyses the possibility to apply energy refurbishment measures in restored historic buildings in order to ensure reuse. The objective of the paper is to provide an appropriate methodology for the structural restoration of historic buildings, their re-use and sustainable energy refurbishment in accordance with current needs and conservation principles. The study provides the analysis and evaluation of the realized goals regarding energy refurbishment and energy efficiency. The presented historic buildings belong to Hilandar Monastery, Mount Athos, Greece. Mount Athos has been listed in UNESCO World Heritage Site for decades. The paper deals with the expert analysis of abandoned and devastated structures included in the Haybarn Complex. This paper provides a positive outcome of the performed restoration in terms of energy refurbishment and repurpose, since these buildings were turned into unique accommodation facilities for visitors. This accomplishment can be seen as a useful recommendation for improving energy efficiency of historic buildings during their restoration. All the undertaken methods are in accordance with the environmental protection requirements. This study is a practical observation and analysis of energy refurbishment in the field of restoration of listed buildings. This certainly is the most important contribution of this paper. All energy efficiency measures and renewable energy sources were carried out in compliance with conservation requirements and visual authenticity of historic structures. Assessment and analysis of energy efficient refurbishment via building performance simulation method and energy efficiency optimization was applied to several different models of restoration that was carried out in the Haybarn Complex.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Re-use of historic buildings and energy refurbishment analysis via building performance simulation a case study",
pages = "2354-2335",
number = "6",
volume = "22",
doi = "10.2298/TSCI171124089S"
}

Šekularac, N. D., Šumarac, D., Tovarović-Cikic, J. Lj., Čokić, M.,& Ivanović-Šekularac, J. A.. (2018). Re-use of historic buildings and energy refurbishment analysis via building performance simulation a case study. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 22(6), 2335-2354.
https://doi.org/10.2298/TSCI171124089S

Šekularac ND, Šumarac D, Tovarović-Cikic JL, Čokić M, Ivanović-Šekularac JA. Re-use of historic buildings and energy refurbishment analysis via building performance simulation a case study. in Thermal Science. 2018;22(6):2335-2354.
doi:10.2298/TSCI171124089S .

Šekularac, Nenad D., Šumarac, Dragoslav, Tovarović-Cikic, Jasna Lj., Čokić, Miloš, Ivanović-Šekularac, Jelena A., "Re-use of historic buildings and energy refurbishment analysis via building performance simulation a case study" in Thermal Science, 22, no. 6 (2018):2335-2354,
https://doi.org/10.2298/TSCI171124089S . .

TY  - CONF
AU  - Petojević, Zorana
AU  - Mitković, Predrag
AU  - Mirković, Nikola
AU  - Milovanović, Jovana
AU  - Ninić, Bojana
AU  - Mirković, Milica
AU  - Šumarac, Dragoslav
AU  - Gospavić, Radovan
AU  - Todorović, Goran
PY  - 2017
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1531
PB  - Građevinski fakultet, Subotica
C3  - Zbornik radova 5. međunarodne konferencije Savremena dostignuća u građevinarstvu 2017
T1  - Estimation of temperature transfer function in facade wall heat transport
T1  - Određivanje transfer funkcije temperature pri prolasku toplote kroz fasadni zid
EP  - 748
SP  - 739
VL  - 33
DO  - 10.14415/konferencijaGFS2017.078
ER  - 

@conference{
author = "Petojević, Zorana and Mitković, Predrag and Mirković, Nikola and Milovanović, Jovana and Ninić, Bojana and Mirković, Milica and Šumarac, Dragoslav and Gospavić, Radovan and Todorović, Goran",
year = "2017",
publisher = "Građevinski fakultet, Subotica",
journal = "Zbornik radova 5. međunarodne konferencije Savremena dostignuća u građevinarstvu 2017",
title = "Estimation of temperature transfer function in facade wall heat transport, Određivanje transfer funkcije temperature pri prolasku toplote kroz fasadni zid",
pages = "748-739",
volume = "33",
doi = "10.14415/konferencijaGFS2017.078"
}

Petojević, Z., Mitković, P., Mirković, N., Milovanović, J., Ninić, B., Mirković, M., Šumarac, D., Gospavić, R.,& Todorović, G.. (2017). Estimation of temperature transfer function in facade wall heat transport. in Zbornik radova 5. međunarodne konferencije Savremena dostignuća u građevinarstvu 2017
Građevinski fakultet, Subotica., 33, 739-748.
https://doi.org/10.14415/konferencijaGFS2017.078

Petojević Z, Mitković P, Mirković N, Milovanović J, Ninić B, Mirković M, Šumarac D, Gospavić R, Todorović G. Estimation of temperature transfer function in facade wall heat transport. in Zbornik radova 5. međunarodne konferencije Savremena dostignuća u građevinarstvu 2017. 2017;33:739-748.
doi:10.14415/konferencijaGFS2017.078 .

Petojević, Zorana, Mitković, Predrag, Mirković, Nikola, Milovanović, Jovana, Ninić, Bojana, Mirković, Milica, Šumarac, Dragoslav, Gospavić, Radovan, Todorović, Goran, "Estimation of temperature transfer function in facade wall heat transport" in Zbornik radova 5. međunarodne konferencije Savremena dostignuća u građevinarstvu 2017, 33 (2017):739-748,
https://doi.org/10.14415/konferencijaGFS2017.078 . .

TY  - CONF
AU  - Mirković, Nikola
AU  - Mitković, Predrag
AU  - Ninić, Bojana
AU  - Milovanović, Jovana
AU  - Mirković, Milica
AU  - Petojević, Zorana
AU  - Šumarac, Dragoslav
AU  - Gospavić, Radovan
AU  - Todorović, Goran
PY  - 2017
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1519
AB  - In this paper, the results of numerical simulation of 2D non-stationary temperature fields in commonly used composite structural members made of steel and concrete in fire conditions were presented. Simulation is based on the model which includes temperature dependence of physical parameters of materials, specific heat and thermal conductivity. Analysis of composite structural members comprises determination of a heat flux field which additionally facilitates understanding of region and geometry ofheat flow, thus enhancing fire protection design. Initial temperature distribution is adopted as uniform, according to Eurocode. Fire conditions were according to ISO 834.The FEM computations for different protection scenario and protective materials for partially encased I section - are conducted in ABAQUS. Obtained results can be used in cost optimization of fire protection measures.
PB  - Građevinski fakultet, Subotica
C3  - Zbornik radova 5. Međunarodne konferencije Savremena dostignuća u građevinarstvu 2017
T1  - Composite structural members in fire conditions and measures of protection
T1  - Spregnuti elementi u uslovima požara i mere zaštite
EP  - 139
SP  - 131
VL  - 33
DO  - 10.14415/konferencijaGFS2017.013
ER  - 

@conference{
author = "Mirković, Nikola and Mitković, Predrag and Ninić, Bojana and Milovanović, Jovana and Mirković, Milica and Petojević, Zorana and Šumarac, Dragoslav and Gospavić, Radovan and Todorović, Goran",
year = "2017",
abstract = "In this paper, the results of numerical simulation of 2D non-stationary temperature fields in commonly used composite structural members made of steel and concrete in fire conditions were presented. Simulation is based on the model which includes temperature dependence of physical parameters of materials, specific heat and thermal conductivity. Analysis of composite structural members comprises determination of a heat flux field which additionally facilitates understanding of region and geometry ofheat flow, thus enhancing fire protection design. Initial temperature distribution is adopted as uniform, according to Eurocode. Fire conditions were according to ISO 834.The FEM computations for different protection scenario and protective materials for partially encased I section - are conducted in ABAQUS. Obtained results can be used in cost optimization of fire protection measures.",
publisher = "Građevinski fakultet, Subotica",
journal = "Zbornik radova 5. Međunarodne konferencije Savremena dostignuća u građevinarstvu 2017",
title = "Composite structural members in fire conditions and measures of protection, Spregnuti elementi u uslovima požara i mere zaštite",
pages = "139-131",
volume = "33",
doi = "10.14415/konferencijaGFS2017.013"
}

Mirković, N., Mitković, P., Ninić, B., Milovanović, J., Mirković, M., Petojević, Z., Šumarac, D., Gospavić, R.,& Todorović, G.. (2017). Composite structural members in fire conditions and measures of protection. in Zbornik radova 5. Međunarodne konferencije Savremena dostignuća u građevinarstvu 2017
Građevinski fakultet, Subotica., 33, 131-139.
https://doi.org/10.14415/konferencijaGFS2017.013

Mirković N, Mitković P, Ninić B, Milovanović J, Mirković M, Petojević Z, Šumarac D, Gospavić R, Todorović G. Composite structural members in fire conditions and measures of protection. in Zbornik radova 5. Međunarodne konferencije Savremena dostignuća u građevinarstvu 2017. 2017;33:131-139.
doi:10.14415/konferencijaGFS2017.013 .

Mirković, Nikola, Mitković, Predrag, Ninić, Bojana, Milovanović, Jovana, Mirković, Milica, Petojević, Zorana, Šumarac, Dragoslav, Gospavić, Radovan, Todorović, Goran, "Composite structural members in fire conditions and measures of protection" in Zbornik radova 5. Međunarodne konferencije Savremena dostignuća u građevinarstvu 2017, 33 (2017):131-139,
https://doi.org/10.14415/konferencijaGFS2017.013 . .

TY  - CONF
AU  - Mirković, Nikola
AU  - Mitković, Predrag
AU  - Divac, Ljubo
AU  - Radovanović, Slobodan
AU  - Šumarac, Dragoslav
PY  - 2017
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1569
PB  - Univerzitet u Novom Sadu, Građevinski fakultet Subotica, Subotica
C3  - Zbornik radova 5. međunarodne konferencije - Savremena dostignuća u građevinarstvu 2017
T1  - Ventilation of long road tunnels in regular and accidental conditions of functioning
EP  - 589
SP  - 581
VL  - 33
DO  - 10.14415/konferencijaGFS2017.062
ER  - 

@conference{
author = "Mirković, Nikola and Mitković, Predrag and Divac, Ljubo and Radovanović, Slobodan and Šumarac, Dragoslav",
year = "2017",
publisher = "Univerzitet u Novom Sadu, Građevinski fakultet Subotica, Subotica",
journal = "Zbornik radova 5. međunarodne konferencije - Savremena dostignuća u građevinarstvu 2017",
title = "Ventilation of long road tunnels in regular and accidental conditions of functioning",
pages = "589-581",
volume = "33",
doi = "10.14415/konferencijaGFS2017.062"
}

Mirković, N., Mitković, P., Divac, L., Radovanović, S.,& Šumarac, D.. (2017). Ventilation of long road tunnels in regular and accidental conditions of functioning. in Zbornik radova 5. međunarodne konferencije - Savremena dostignuća u građevinarstvu 2017
Univerzitet u Novom Sadu, Građevinski fakultet Subotica, Subotica., 33, 581-589.
https://doi.org/10.14415/konferencijaGFS2017.062

Mirković N, Mitković P, Divac L, Radovanović S, Šumarac D. Ventilation of long road tunnels in regular and accidental conditions of functioning. in Zbornik radova 5. međunarodne konferencije - Savremena dostignuća u građevinarstvu 2017. 2017;33:581-589.
doi:10.14415/konferencijaGFS2017.062 .

Mirković, Nikola, Mitković, Predrag, Divac, Ljubo, Radovanović, Slobodan, Šumarac, Dragoslav, "Ventilation of long road tunnels in regular and accidental conditions of functioning" in Zbornik radova 5. međunarodne konferencije - Savremena dostignuća u građevinarstvu 2017, 33 (2017):581-589,
https://doi.org/10.14415/konferencijaGFS2017.062 . .

TY  - CONF
AU  - Kekanović, Milan
AU  - Šumarac, Dragoslav
AU  - Ćorić, Stanko
AU  - Kasaš, Karolj
AU  - Čeh, Arpad
PY  - 2017
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1546
AB  - This article provides information about the possibilities of design and construction floor slabs concerning three very important aspects: the capacity, safety and energy efficiency.Nowadays, in the Republic of Serbia exclusively solid concrete slabs are designed and built,which are at least 20cm thick.The justification for this solution is to obtain, in its plane, a rigid plate-diaphragm that is able to endure seismic forces on the walls, proportionally to the stiffness of those walls.At the same time this solution has many disadvantages and it is a great load that limits the length of the span. That heavy load is directly proportional to the size of the seismic forces. The20 cm thick, solid concrete slab has a large heat capacity, and specific heat c (J / kgK), which are not energy efficient,as the warm air is accumulated, conductedtowards to the walls and also retained near the ceiling, while people are near the floor.There are other solutions of design and construction floor slabs that meet demands far more than a solid concrete slab.These are the reinforced concrete site-cast waffle slab.These slabs are extremely stiff and stable, optionally in both directions and can have a reduced mass up to 50% compared with solid concrete slabs.The authors will introduce one waffle-slab solution of reinforced concrete slabs, which satisfies, in addition to above mentioned, even the energy efficiency demand. It is a solution by Stirofert-technology built with structural expanded polystyrene as a stay-in-place formwork during the phase of concrete pouring and construction. This same stay-in-place formwork is a powerful insulation on ceiling with a preventing effect against heat-accumulation and heat losses towards the walls; same time equalizing the temperature of air near the floor and ceiling.
PB  - Građevinski fakultet, Subotica
C3  - Zbornik radova 5. međunarodne konferencije Savremena dostignuća u građevinarstvu 2017
T1  - Problems of floor slab design in terms of capacity, safety and energy efficiency
T1  - Problematika projektovanja međuspratnih ploča sa aspekta nosivosti, sigurnosti i energetske efikasnosti
EP  - 738
SP  - 729
VL  - 33
DO  - 10.14415/konferencijaGFS2017.077
ER  - 

@conference{
author = "Kekanović, Milan and Šumarac, Dragoslav and Ćorić, Stanko and Kasaš, Karolj and Čeh, Arpad",
year = "2017",
abstract = "This article provides information about the possibilities of design and construction floor slabs concerning three very important aspects: the capacity, safety and energy efficiency.Nowadays, in the Republic of Serbia exclusively solid concrete slabs are designed and built,which are at least 20cm thick.The justification for this solution is to obtain, in its plane, a rigid plate-diaphragm that is able to endure seismic forces on the walls, proportionally to the stiffness of those walls.At the same time this solution has many disadvantages and it is a great load that limits the length of the span. That heavy load is directly proportional to the size of the seismic forces. The20 cm thick, solid concrete slab has a large heat capacity, and specific heat c (J / kgK), which are not energy efficient,as the warm air is accumulated, conductedtowards to the walls and also retained near the ceiling, while people are near the floor.There are other solutions of design and construction floor slabs that meet demands far more than a solid concrete slab.These are the reinforced concrete site-cast waffle slab.These slabs are extremely stiff and stable, optionally in both directions and can have a reduced mass up to 50% compared with solid concrete slabs.The authors will introduce one waffle-slab solution of reinforced concrete slabs, which satisfies, in addition to above mentioned, even the energy efficiency demand. It is a solution by Stirofert-technology built with structural expanded polystyrene as a stay-in-place formwork during the phase of concrete pouring and construction. This same stay-in-place formwork is a powerful insulation on ceiling with a preventing effect against heat-accumulation and heat losses towards the walls; same time equalizing the temperature of air near the floor and ceiling.",
publisher = "Građevinski fakultet, Subotica",
journal = "Zbornik radova 5. međunarodne konferencije Savremena dostignuća u građevinarstvu 2017",
title = "Problems of floor slab design in terms of capacity, safety and energy efficiency, Problematika projektovanja međuspratnih ploča sa aspekta nosivosti, sigurnosti i energetske efikasnosti",
pages = "738-729",
volume = "33",
doi = "10.14415/konferencijaGFS2017.077"
}

Kekanović, M., Šumarac, D., Ćorić, S., Kasaš, K.,& Čeh, A.. (2017). Problems of floor slab design in terms of capacity, safety and energy efficiency. in Zbornik radova 5. međunarodne konferencije Savremena dostignuća u građevinarstvu 2017
Građevinski fakultet, Subotica., 33, 729-738.
https://doi.org/10.14415/konferencijaGFS2017.077

Kekanović M, Šumarac D, Ćorić S, Kasaš K, Čeh A. Problems of floor slab design in terms of capacity, safety and energy efficiency. in Zbornik radova 5. međunarodne konferencije Savremena dostignuća u građevinarstvu 2017. 2017;33:729-738.
doi:10.14415/konferencijaGFS2017.077 .

Kekanović, Milan, Šumarac, Dragoslav, Ćorić, Stanko, Kasaš, Karolj, Čeh, Arpad, "Problems of floor slab design in terms of capacity, safety and energy efficiency" in Zbornik radova 5. međunarodne konferencije Savremena dostignuća u građevinarstvu 2017, 33 (2017):729-738,
https://doi.org/10.14415/konferencijaGFS2017.077 . .

TY  - CONF
AU  - Perović, Zoran
AU  - Šumarac, Dragoslav
PY  - 2017
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1547
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  - Elastoplastic analysis of frame structures subjected to cyclic loading
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1547
ER  - 

@conference{
author = "Perović, Zoran and Šumarac, Dragoslav",
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 = "Elastoplastic analysis of frame structures subjected to cyclic loading",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1547"
}

Perović, Z.,& Šumarac, D.. (2017). Elastoplastic analysis of frame structures subjected to cyclic loading. 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_1547

Perović Z, Šumarac D. Elastoplastic analysis of frame structures subjected to cyclic loading. 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_1547 .

Perović, Zoran, Šumarac, Dragoslav, "Elastoplastic analysis of frame structures subjected to cyclic loading" 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_1547 .

TY  - CONF
AU  - Perović, Zoran
AU  - Šumarac, Dragoslav
PY  - 2017
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1529
AB  - In this paper, three dimensional frame structures, subjected to cyclic loading are analyzed. In numerical examples, rectangular and I cross section shapes are used for elements of structures subjected to various loading cases. For definition of material behavior, elastoplastic model of material, based on the Preisach model of hysteresis is used. Some aspects of convergence, as well as numerical performance of this analysis are shown.
C3  - Zbornik radova 5. međunarodne konferencije Savremena dostignuća u građevinarstvu 2017
T1  - Three-dimensional frame structures subjected to cyclic loading
T1  - Prostorne ramovske konstrukcije pri cikličnom opterećenju
EP  - 376
SP  - 369
VL  - 33
DO  - 10.14415/konferencijaGFS2017.038
ER  - 

@conference{
author = "Perović, Zoran and Šumarac, Dragoslav",
year = "2017",
abstract = "In this paper, three dimensional frame structures, subjected to cyclic loading are analyzed. In numerical examples, rectangular and I cross section shapes are used for elements of structures subjected to various loading cases. For definition of material behavior, elastoplastic model of material, based on the Preisach model of hysteresis is used. Some aspects of convergence, as well as numerical performance of this analysis are shown.",
journal = "Zbornik radova 5. međunarodne konferencije Savremena dostignuća u građevinarstvu 2017",
title = "Three-dimensional frame structures subjected to cyclic loading, Prostorne ramovske konstrukcije pri cikličnom opterećenju",
pages = "376-369",
volume = "33",
doi = "10.14415/konferencijaGFS2017.038"
}

Perović, Z.,& Šumarac, D.. (2017). Three-dimensional frame structures subjected to cyclic loading. in Zbornik radova 5. međunarodne konferencije Savremena dostignuća u građevinarstvu 2017, 33, 369-376.
https://doi.org/10.14415/konferencijaGFS2017.038

Perović Z, Šumarac D. Three-dimensional frame structures subjected to cyclic loading. in Zbornik radova 5. međunarodne konferencije Savremena dostignuća u građevinarstvu 2017. 2017;33:369-376.
doi:10.14415/konferencijaGFS2017.038 .

Perović, Zoran, Šumarac, Dragoslav, "Three-dimensional frame structures subjected to cyclic loading" in Zbornik radova 5. međunarodne konferencije Savremena dostignuća u građevinarstvu 2017, 33 (2017):369-376,
https://doi.org/10.14415/konferencijaGFS2017.038 . .

TY  - CONF
AU  - Radović, Andrija
AU  - Blagojević, Nikola
AU  - Šumarac, Dragoslav
PY  - 2017
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1524
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  - Stability analysis of vertical cuts
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1524
ER  - 

@conference{
author = "Radović, Andrija and Blagojević, Nikola and Šumarac, Dragoslav",
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 = "Stability analysis of vertical cuts",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1524"
}

Radović, A., Blagojević, N.,& Šumarac, D.. (2017). Stability analysis of vertical cuts. 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_1524

Radović A, Blagojević N, Šumarac D. Stability analysis of vertical cuts. 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_1524 .

Radović, Andrija, Blagojević, Nikola, Šumarac, Dragoslav, "Stability analysis of vertical cuts" 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_1524 .

TY  - CONF
AU  - Mirković, Nikola
AU  - Milićević, Ivan
AU  - Šumarac, Dragoslav
PY  - 2016
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1407
AB  - The paper analyzes the results of reinforced concrete flat slabs, using different methods based on the theory of elasticity and theory of plasticity. Were considered three methods: stripe method, method according to Hillerborg and Wiesinger and Yield Line theory. The stripe method based on the theory of elasticity and is one of the most commonly used methods for calculation flat slabs, which are recommended by many regulations for calculation reinforced concrete structures. This paper also presents two methods based on the theory of plasticity, the method according to Hillerborg and Wiesinger - lower bound and Yield Line theory - upper bound, which uses a solutions of Johansen. Solutions obtained by these methods define limits interval of critical load. Review the basic theoretical hypothesis of all these methods and their application to flat slabs. Conducted calculation according to Eurocode 2 with a regular arrangement of pillars, analyzed the results and commented differences that occur as a result of the adoption of various hypothesis.
AB  - U radu su analizirani rezultati proračuna armiranobetonskih ploča direktno oslonjenih na stubove, koristeći različite metode koje se zasnivaju na teoriji elastičnosti i teoriji plastičnosti. Razmatrane su tri metode: metoda ekvivalentnih traka, metoda prema Hillerborg-u i Wiesinger-u i metoda linija loma. Metoda ekvivalentnih traka zasniva se na teoriji elastičnosti i jedna je od najčešće primenjivanih metoda za proračun ploča direktno oslonjenih na stubove, koju preporučuju mnogi propisi za proračun armiranobetonskih konstrukcija. U radu su predstavljene i dve metode koje se zasnivaju na teoriji plastičnosti, metoda prema Hillerborg-u i Wiesinger-u teorija donje granice i metoda linija loma (Yield Line theory) teorija gornje granice, koja koristi rešenja Johansen-a. Rešenja dobijena ovim metodama definišu granice intervala kritičnog opterećenja. Prikazane su osnovne teorijske pretpostavke svih navedenih metoda kao i njihova primena na ploče direktno oslonjene na stubove. Sproveden je proračun ploče prema Evrokodu 2 sa pravilnim rasporedom stubova, analizirani su rezultati i komentarisane razlike koje se javljaju kao posledica usvajanja različitih pretpostavki.
PB  - Građevinski fakultet Subotica, Subotica
C3  - Zbornik radova 4. međunarodne konferencije Savremena dostignuća u građevinarstvu 2016
T1  - Review of the methods for analysis of flat slabs
T1  - Prikaz metoda za proračun ploča direktno oslonjenih na stubove
EP  - 68
SP  - 59
VL  - 32
DO  - 10.14415/konferencijaGFS2016.004
ER  - 

@conference{
author = "Mirković, Nikola and Milićević, Ivan and Šumarac, Dragoslav",
year = "2016",
abstract = "The paper analyzes the results of reinforced concrete flat slabs, using different methods based on the theory of elasticity and theory of plasticity. Were considered three methods: stripe method, method according to Hillerborg and Wiesinger and Yield Line theory. The stripe method based on the theory of elasticity and is one of the most commonly used methods for calculation flat slabs, which are recommended by many regulations for calculation reinforced concrete structures. This paper also presents two methods based on the theory of plasticity, the method according to Hillerborg and Wiesinger - lower bound and Yield Line theory - upper bound, which uses a solutions of Johansen. Solutions obtained by these methods define limits interval of critical load. Review the basic theoretical hypothesis of all these methods and their application to flat slabs. Conducted calculation according to Eurocode 2 with a regular arrangement of pillars, analyzed the results and commented differences that occur as a result of the adoption of various hypothesis., U radu su analizirani rezultati proračuna armiranobetonskih ploča direktno oslonjenih na stubove, koristeći različite metode koje se zasnivaju na teoriji elastičnosti i teoriji plastičnosti. Razmatrane su tri metode: metoda ekvivalentnih traka, metoda prema Hillerborg-u i Wiesinger-u i metoda linija loma. Metoda ekvivalentnih traka zasniva se na teoriji elastičnosti i jedna je od najčešće primenjivanih metoda za proračun ploča direktno oslonjenih na stubove, koju preporučuju mnogi propisi za proračun armiranobetonskih konstrukcija. U radu su predstavljene i dve metode koje se zasnivaju na teoriji plastičnosti, metoda prema Hillerborg-u i Wiesinger-u teorija donje granice i metoda linija loma (Yield Line theory) teorija gornje granice, koja koristi rešenja Johansen-a. Rešenja dobijena ovim metodama definišu granice intervala kritičnog opterećenja. Prikazane su osnovne teorijske pretpostavke svih navedenih metoda kao i njihova primena na ploče direktno oslonjene na stubove. Sproveden je proračun ploče prema Evrokodu 2 sa pravilnim rasporedom stubova, analizirani su rezultati i komentarisane razlike koje se javljaju kao posledica usvajanja različitih pretpostavki.",
publisher = "Građevinski fakultet Subotica, Subotica",
journal = "Zbornik radova 4. međunarodne konferencije Savremena dostignuća u građevinarstvu 2016",
title = "Review of the methods for analysis of flat slabs, Prikaz metoda za proračun ploča direktno oslonjenih na stubove",
pages = "68-59",
volume = "32",
doi = "10.14415/konferencijaGFS2016.004"
}

Mirković, N., Milićević, I.,& Šumarac, D.. (2016). Review of the methods for analysis of flat slabs. in Zbornik radova 4. međunarodne konferencije Savremena dostignuća u građevinarstvu 2016
Građevinski fakultet Subotica, Subotica., 32, 59-68.
https://doi.org/10.14415/konferencijaGFS2016.004

Mirković N, Milićević I, Šumarac D. Review of the methods for analysis of flat slabs. in Zbornik radova 4. međunarodne konferencije Savremena dostignuća u građevinarstvu 2016. 2016;32:59-68.
doi:10.14415/konferencijaGFS2016.004 .

Mirković, Nikola, Milićević, Ivan, Šumarac, Dragoslav, "Review of the methods for analysis of flat slabs" in Zbornik radova 4. međunarodne konferencije Savremena dostignuća u građevinarstvu 2016, 32 (2016):59-68,
https://doi.org/10.14415/konferencijaGFS2016.004 . .

TY  - CONF
AU  - Mitković, Predrag
AU  - Obradović, Nikola
AU  - Šumarac, Dragoslav
PY  - 2016
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1495
AB  - Determination of critical height of vertical slope is a very important task in geotechnical engineering. Recently, increasing number of researchers is suggesting new solutions to this task using principles of fracture mechanics, instead of classical solutions based on principles of soil mechanics. This is especially used when tension crack is present in soil. In this paper, a solution to this problem based on limit equilibrium and a solution based on upper bound theorem of limit analysis. is presented. Also, analysis of several papers from different researchers, who used fracture mechanics to solve this problem are considered. Findings obtained in those papers are presented and conclusions are made. At the end, authors’ suggestions of the way to solve this problem are given.
C3  - Zbornik radova 4. međunarodne konferencije Savremena dostignuća u građevinarstvu
T1  - Stability analysis of vertical slope using fracture mechanics
T1  - Analiza stabilnosti vertikalnog zaseka primenom mehanike loma
EP  - 548
SP  - 537
VL  - 32
DO  - 10.14415/konferencijaGFS2016.055
ER  - 

@conference{
author = "Mitković, Predrag and Obradović, Nikola and Šumarac, Dragoslav",
year = "2016",
abstract = "Determination of critical height of vertical slope is a very important task in geotechnical engineering. Recently, increasing number of researchers is suggesting new solutions to this task using principles of fracture mechanics, instead of classical solutions based on principles of soil mechanics. This is especially used when tension crack is present in soil. In this paper, a solution to this problem based on limit equilibrium and a solution based on upper bound theorem of limit analysis. is presented. Also, analysis of several papers from different researchers, who used fracture mechanics to solve this problem are considered. Findings obtained in those papers are presented and conclusions are made. At the end, authors’ suggestions of the way to solve this problem are given.",
journal = "Zbornik radova 4. međunarodne konferencije Savremena dostignuća u građevinarstvu",
title = "Stability analysis of vertical slope using fracture mechanics, Analiza stabilnosti vertikalnog zaseka primenom mehanike loma",
pages = "548-537",
volume = "32",
doi = "10.14415/konferencijaGFS2016.055"
}

Mitković, P., Obradović, N.,& Šumarac, D.. (2016). Stability analysis of vertical slope using fracture mechanics. in Zbornik radova 4. međunarodne konferencije Savremena dostignuća u građevinarstvu, 32, 537-548.
https://doi.org/10.14415/konferencijaGFS2016.055

Mitković P, Obradović N, Šumarac D. Stability analysis of vertical slope using fracture mechanics. in Zbornik radova 4. međunarodne konferencije Savremena dostignuća u građevinarstvu. 2016;32:537-548.
doi:10.14415/konferencijaGFS2016.055 .

Mitković, Predrag, Obradović, Nikola, Šumarac, Dragoslav, "Stability analysis of vertical slope using fracture mechanics" in Zbornik radova 4. međunarodne konferencije Savremena dostignuća u građevinarstvu, 32 (2016):537-548,
https://doi.org/10.14415/konferencijaGFS2016.055 . .

TY  - CONF
AU  - Ćorić, Stanko
AU  - Perović, Zoran
AU  - Šumarac, Dragoslav
PY  - 2016
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1485
AB  - Although there are a large number of buildings with high energy consumption in Serbia, there is a possibility to reduce it by investing in renovation of such buildings. Windows and doors, which are part of thermal envelope of building, play a very important role in the overall energy efficiency of the building. In this paper, some aspects of reducing energy consumption of buildings in urban area are presented through renovation project and experimental measurements. The results of increased energy efficiency of one public building, obtained by changing doors and windows only, are given. Experimental measurements by thermovision camera in several residential buildings are shown in this paper. These measurements indicate importance of installing adequate windows as part of thermal envelope of buildings. In addition, corresponding data, from overall state of energy efficiency of buildings in Serbia, is presented.
PB  - Građevinski fakultet, Subotica
C3  - Zbornik radova 4. Međunarodne konferencije Savremena dostignuća u građevinarstvu 2016
T1  - Improvement of energy efficiency of buildings in urban areas
EP  - 880
SP  - 873
DO  - 10.14415/konferencijaGFS
ER  - 

@conference{
author = "Ćorić, Stanko and Perović, Zoran and Šumarac, Dragoslav",
year = "2016",
abstract = "Although there are a large number of buildings with high energy consumption in Serbia, there is a possibility to reduce it by investing in renovation of such buildings. Windows and doors, which are part of thermal envelope of building, play a very important role in the overall energy efficiency of the building. In this paper, some aspects of reducing energy consumption of buildings in urban area are presented through renovation project and experimental measurements. The results of increased energy efficiency of one public building, obtained by changing doors and windows only, are given. Experimental measurements by thermovision camera in several residential buildings are shown in this paper. These measurements indicate importance of installing adequate windows as part of thermal envelope of buildings. In addition, corresponding data, from overall state of energy efficiency of buildings in Serbia, is presented.",
publisher = "Građevinski fakultet, Subotica",
journal = "Zbornik radova 4. Međunarodne konferencije Savremena dostignuća u građevinarstvu 2016",
title = "Improvement of energy efficiency of buildings in urban areas",
pages = "880-873",
doi = "10.14415/konferencijaGFS"
}

Ćorić, S., Perović, Z.,& Šumarac, D.. (2016). Improvement of energy efficiency of buildings in urban areas. in Zbornik radova 4. Međunarodne konferencije Savremena dostignuća u građevinarstvu 2016
Građevinski fakultet, Subotica., 873-880.
https://doi.org/10.14415/konferencijaGFS

Ćorić S, Perović Z, Šumarac D. Improvement of energy efficiency of buildings in urban areas. in Zbornik radova 4. Međunarodne konferencije Savremena dostignuća u građevinarstvu 2016. 2016;:873-880.
doi:10.14415/konferencijaGFS .

Ćorić, Stanko, Perović, Zoran, Šumarac, Dragoslav, "Improvement of energy efficiency of buildings in urban areas" in Zbornik radova 4. Međunarodne konferencije Savremena dostignuća u građevinarstvu 2016 (2016):873-880,
https://doi.org/10.14415/konferencijaGFS . .

TY  - JOUR
AU  - Đoković, Jelena M.
AU  - Nikolić, Ruzica R.
AU  - Šumarac, Dragoslav
AU  - Bujnak, Jan
PY  - 2016
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/802
AB  - A problem of a dynamically growing crack, which is approaching an interface between the two elastic isotropic materials at an arbitrary angle, is considered in this paper. That crack could behave in three ways: (i) it can arrest at contact with the interface, (ii) it can deflect into the interface and continue to propagate along it or (iii) the crack can penetrate the interface and continue to propagate in the material across it. The competition between the latter two cases can be estimated by considering the ratio of the energy release rates necessary for the crack penetrating the interface and for the crack deflecting into the interface. A concept that the criterion for the dynamic crack growth in homogeneous solids could be based on the static stress field, with addition of the stress intensity factor dependent on time, is used here to explain the behavior of the crack approaching the interface in dynamic loading conditions. Obtained results enable comparison of the interface dynamic fracture toughness to the fracture toughness of the base material (without the interface), to determine whether the incoming crack would deflect into or would penetrate the interface. If the ratio between the dynamic fracture toughness of the interface and the dynamic fracture toughness of the material into which the crack continues to propagate was less than the ratio of the dynamic release rates for the deflecting and penetrating crack, the incoming crack would deflect into the interface. If the case was reversed, the crack would cross the interface and continue to propagate in the material across it. Comparison of results for the load phase angle dependence on the crack tip propagation speed and on the approaching angle, obtained by this criterion and by the maximum stress direction criterion, proves the validity of the energy release rate concept adopted in this analysis.
PB  - SAGE Publications Ltd
T2  - International Journal of Damage Mechanics
T1  - Analysis based on the energy release rate criterion of a dynamically growing crack approaching an interface
EP  - 1183
IS  - 8
SP  - 1170
VL  - 25
DO  - 10.1177/1056789516650246
ER  - 

@article{
author = "Đoković, Jelena M. and Nikolić, Ruzica R. and Šumarac, Dragoslav and Bujnak, Jan",
year = "2016",
abstract = "A problem of a dynamically growing crack, which is approaching an interface between the two elastic isotropic materials at an arbitrary angle, is considered in this paper. That crack could behave in three ways: (i) it can arrest at contact with the interface, (ii) it can deflect into the interface and continue to propagate along it or (iii) the crack can penetrate the interface and continue to propagate in the material across it. The competition between the latter two cases can be estimated by considering the ratio of the energy release rates necessary for the crack penetrating the interface and for the crack deflecting into the interface. A concept that the criterion for the dynamic crack growth in homogeneous solids could be based on the static stress field, with addition of the stress intensity factor dependent on time, is used here to explain the behavior of the crack approaching the interface in dynamic loading conditions. Obtained results enable comparison of the interface dynamic fracture toughness to the fracture toughness of the base material (without the interface), to determine whether the incoming crack would deflect into or would penetrate the interface. If the ratio between the dynamic fracture toughness of the interface and the dynamic fracture toughness of the material into which the crack continues to propagate was less than the ratio of the dynamic release rates for the deflecting and penetrating crack, the incoming crack would deflect into the interface. If the case was reversed, the crack would cross the interface and continue to propagate in the material across it. Comparison of results for the load phase angle dependence on the crack tip propagation speed and on the approaching angle, obtained by this criterion and by the maximum stress direction criterion, proves the validity of the energy release rate concept adopted in this analysis.",
publisher = "SAGE Publications Ltd",
journal = "International Journal of Damage Mechanics",
title = "Analysis based on the energy release rate criterion of a dynamically growing crack approaching an interface",
pages = "1183-1170",
number = "8",
volume = "25",
doi = "10.1177/1056789516650246"
}

Đoković, J. M., Nikolić, R. R., Šumarac, D.,& Bujnak, J.. (2016). Analysis based on the energy release rate criterion of a dynamically growing crack approaching an interface. in International Journal of Damage Mechanics
SAGE Publications Ltd., 25(8), 1170-1183.
https://doi.org/10.1177/1056789516650246

Đoković JM, Nikolić RR, Šumarac D, Bujnak J. Analysis based on the energy release rate criterion of a dynamically growing crack approaching an interface. in International Journal of Damage Mechanics. 2016;25(8):1170-1183.
doi:10.1177/1056789516650246 .

Đoković, Jelena M., Nikolić, Ruzica R., Šumarac, Dragoslav, Bujnak, Jan, "Analysis based on the energy release rate criterion of a dynamically growing crack approaching an interface" in International Journal of Damage Mechanics, 25, no. 8 (2016):1170-1183,
https://doi.org/10.1177/1056789516650246 . .