Simović, Nađa

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orcid::0000-0002-9690-1668
  • Simović, Nađa (5)
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Author's Bibliography

Determination of Mode I fracture properties of European spruce

Todorović, Marija; Koetsier, Mathieu; Simović, Nađa; Glišović, Ivan; Pavlović, Marko

(2023)

TY  - JOUR
AU  - Todorović, Marija
AU  - Koetsier, Mathieu
AU  - Simović, Nađa
AU  - Glišović, Ivan
AU  - Pavlović, Marko
PY  - 2023
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3089
AB  - In this paper an efficient procedure for obtaining a cohesive law for Mode I timber fracture (crack opening), based on the Double Cantilever Beam (DCB) tests is given. DCB tests were performed on ten European spruce specimens in order to determine the energy release rate vs crack length (R curves). Two crucial parameters - crack length during the experiment and the crack tip opening displacement were obtained using 2D Digital Image Correlation (DIC) technique. In order to determine accurate fracture resistance (R curve), procedure which includes calculating cumulative released energy was employed. The cohesive law for Mode I fracture of wood was obtained by differentiation of the strain energy release rate as a function of the crack tip opening displacement. This cohesive law is further implemented in the successful numerical modelling of failure modes in large-scale end-notched glulam beams which were experimentally tested in four-point bending configuration.
T2  - Wood Research
T1  - Determination of Mode I fracture properties of European spruce
EP  - 347
IS  - 2
SP  - 334
VL  - 68
DO  - 10.37763/wr.1336-4561/68.2.334347
ER  - 
@article{
author = "Todorović, Marija and Koetsier, Mathieu and Simović, Nađa and Glišović, Ivan and Pavlović, Marko",
year = "2023",
abstract = "In this paper an efficient procedure for obtaining a cohesive law for Mode I timber fracture (crack opening), based on the Double Cantilever Beam (DCB) tests is given. DCB tests were performed on ten European spruce specimens in order to determine the energy release rate vs crack length (R curves). Two crucial parameters - crack length during the experiment and the crack tip opening displacement were obtained using 2D Digital Image Correlation (DIC) technique. In order to determine accurate fracture resistance (R curve), procedure which includes calculating cumulative released energy was employed. The cohesive law for Mode I fracture of wood was obtained by differentiation of the strain energy release rate as a function of the crack tip opening displacement. This cohesive law is further implemented in the successful numerical modelling of failure modes in large-scale end-notched glulam beams which were experimentally tested in four-point bending configuration.",
journal = "Wood Research",
title = "Determination of Mode I fracture properties of European spruce",
pages = "347-334",
number = "2",
volume = "68",
doi = "10.37763/wr.1336-4561/68.2.334347"
}
Todorović, M., Koetsier, M., Simović, N., Glišović, I.,& Pavlović, M.. (2023). Determination of Mode I fracture properties of European spruce. in Wood Research, 68(2), 334-347.
https://doi.org/10.37763/wr.1336-4561/68.2.334347
Todorović M, Koetsier M, Simović N, Glišović I, Pavlović M. Determination of Mode I fracture properties of European spruce. in Wood Research. 2023;68(2):334-347.
doi:10.37763/wr.1336-4561/68.2.334347 .
Todorović, Marija, Koetsier, Mathieu, Simović, Nađa, Glišović, Ivan, Pavlović, Marko, "Determination of Mode I fracture properties of European spruce" in Wood Research, 68, no. 2 (2023):334-347,
https://doi.org/10.37763/wr.1336-4561/68.2.334347 . .

Design of cross-laminated timber (CLT) floors for human-induced vibrations

Simović, Nađa; Glišović, Ivan; Todorović, Marija

(Society for Materials and Structures Testing of Serbia, 2023)

TY  - JOUR
AU  - Simović, Nađa
AU  - Glišović, Ivan
AU  - Todorović, Marija
PY  - 2023
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3049
AB  - Cross-laminated timber (CLT) is an innovative engineering wood product made by gluing layers of solid timber boards placed in an orthogonally alternating orientation to the neighbouring layers. CLT panels provide an efficient solution for floors in single- and multi-storey buildings. Due to their light weight and often long-span, the design of these floors is generally governed by serviceability limit state criteria, that is, deflection or vibration limits. Vibrations induced by dynamic actions, such as people walking and their everyday activities, cannot result in structural failure but may cause discomfort to occupants if vibrations are not properly controlled. This paper gives an overview of some available methods for the vibration serviceability design of residential CLT floors. Differences between these methods are discussed through the consideration of criteria and their limit values. Although some criteria are common to certain methods, it may happen that the same criteria take into account different factors. In order to get a better description of the actual behaviour of floor structure, certain classifications of floors based on vibration serviceability performance were introduced in design methods.
PB  - Society for Materials and Structures Testing of Serbia
PB  - University of Belgrade Faculty of Civil Engineering
PB  - Association of Structural Engineers of Serbia
T2  - Building Materials and Structures
T1  - Design of cross-laminated timber (CLT) floors for human-induced vibrations
VL  - 66 (2023) 69-78
DO  - 10.5937/GRMK2301069S
ER  - 
@article{
author = "Simović, Nađa and Glišović, Ivan and Todorović, Marija",
year = "2023",
abstract = "Cross-laminated timber (CLT) is an innovative engineering wood product made by gluing layers of solid timber boards placed in an orthogonally alternating orientation to the neighbouring layers. CLT panels provide an efficient solution for floors in single- and multi-storey buildings. Due to their light weight and often long-span, the design of these floors is generally governed by serviceability limit state criteria, that is, deflection or vibration limits. Vibrations induced by dynamic actions, such as people walking and their everyday activities, cannot result in structural failure but may cause discomfort to occupants if vibrations are not properly controlled. This paper gives an overview of some available methods for the vibration serviceability design of residential CLT floors. Differences between these methods are discussed through the consideration of criteria and their limit values. Although some criteria are common to certain methods, it may happen that the same criteria take into account different factors. In order to get a better description of the actual behaviour of floor structure, certain classifications of floors based on vibration serviceability performance were introduced in design methods.",
publisher = "Society for Materials and Structures Testing of Serbia, University of Belgrade Faculty of Civil Engineering, Association of Structural Engineers of Serbia",
journal = "Building Materials and Structures",
title = "Design of cross-laminated timber (CLT) floors for human-induced vibrations",
volume = "66 (2023) 69-78",
doi = "10.5937/GRMK2301069S"
}
Simović, N., Glišović, I.,& Todorović, M.. (2023). Design of cross-laminated timber (CLT) floors for human-induced vibrations. in Building Materials and Structures
Society for Materials and Structures Testing of Serbia., 66 (2023) 69-78.
https://doi.org/10.5937/GRMK2301069S
Simović N, Glišović I, Todorović M. Design of cross-laminated timber (CLT) floors for human-induced vibrations. in Building Materials and Structures. 2023;66 (2023) 69-78.
doi:10.5937/GRMK2301069S .
Simović, Nađa, Glišović, Ivan, Todorović, Marija, "Design of cross-laminated timber (CLT) floors for human-induced vibrations" in Building Materials and Structures, 66 (2023) 69-78 (2023),
https://doi.org/10.5937/GRMK2301069S . .
1

Bending behaviour of cross laminated timber panels made from locally sourced spruce wood

Todorović, Marija; Simović, Nađa; Glišović, Ivan

(MASE - Macedonian Association of Structural Engineers, 2023)

TY  - CONF
AU  - Todorović, Marija
AU  - Simović, Nađa
AU  - Glišović, Ivan
PY  - 2023
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3185
AB  - Cross laminated timber (CLT) is relatively new engineering wood product made by gluing cross-wise layers of solid timber boards to form large-scale panels. Due to excellent in-plane and out-of-plane resistance, CLT panels have become very common as wall and floor structural elements. CLT is validated as an excellent alternative to more traditional construction materials like reinforced concrete and steel for use in single- and multi-storey buildings.
This paper presents an experimental study conducted on five-layer CLT panels manufactured using spruce boards. The panels were tested in four-point bending configuration, loaded in the out-of-plane direction. Bending behaviour of CLT panels in the major axis orientation was evaluated through failure modes, load-deflection relationship, ultimate moment capacity, stiffness and strain distribution profile. The obtained experimental results indicated brittle failure modes and linear load-deflection relationship up to failure. In addition, strain distributions of panels were quite linear during the entire loading, confirming the assumption that plane sections remain plane after bending.
Bending response of CLT panels was also investigated using finite element modelling. The stress and deflection analysis was executed in the RFEM software using the RF-LAMINATE module. The calculation was carried out according to the laminate theory, taking into account shear coupling of layers. A good agreement between the results of numerical model and experimental investigation was found.
PB  - MASE - Macedonian Association of Structural Engineers
C3  - Proceedings from the 20th International Symposium of MASE
T1  - Bending behaviour of cross laminated timber panels made from locally sourced spruce wood
UR  - https://hdl.handle.net/21.15107/rcub_grafar_3185
ER  - 
@conference{
author = "Todorović, Marija and Simović, Nađa and Glišović, Ivan",
year = "2023",
abstract = "Cross laminated timber (CLT) is relatively new engineering wood product made by gluing cross-wise layers of solid timber boards to form large-scale panels. Due to excellent in-plane and out-of-plane resistance, CLT panels have become very common as wall and floor structural elements. CLT is validated as an excellent alternative to more traditional construction materials like reinforced concrete and steel for use in single- and multi-storey buildings.
This paper presents an experimental study conducted on five-layer CLT panels manufactured using spruce boards. The panels were tested in four-point bending configuration, loaded in the out-of-plane direction. Bending behaviour of CLT panels in the major axis orientation was evaluated through failure modes, load-deflection relationship, ultimate moment capacity, stiffness and strain distribution profile. The obtained experimental results indicated brittle failure modes and linear load-deflection relationship up to failure. In addition, strain distributions of panels were quite linear during the entire loading, confirming the assumption that plane sections remain plane after bending.
Bending response of CLT panels was also investigated using finite element modelling. The stress and deflection analysis was executed in the RFEM software using the RF-LAMINATE module. The calculation was carried out according to the laminate theory, taking into account shear coupling of layers. A good agreement between the results of numerical model and experimental investigation was found.",
publisher = "MASE - Macedonian Association of Structural Engineers",
journal = "Proceedings from the 20th International Symposium of MASE",
title = "Bending behaviour of cross laminated timber panels made from locally sourced spruce wood",
url = "https://hdl.handle.net/21.15107/rcub_grafar_3185"
}
Todorović, M., Simović, N.,& Glišović, I.. (2023). Bending behaviour of cross laminated timber panels made from locally sourced spruce wood. in Proceedings from the 20th International Symposium of MASE
MASE - Macedonian Association of Structural Engineers..
https://hdl.handle.net/21.15107/rcub_grafar_3185
Todorović M, Simović N, Glišović I. Bending behaviour of cross laminated timber panels made from locally sourced spruce wood. in Proceedings from the 20th International Symposium of MASE. 2023;.
https://hdl.handle.net/21.15107/rcub_grafar_3185 .
Todorović, Marija, Simović, Nađa, Glišović, Ivan, "Bending behaviour of cross laminated timber panels made from locally sourced spruce wood" in Proceedings from the 20th International Symposium of MASE (2023),
https://hdl.handle.net/21.15107/rcub_grafar_3185 .

Vibration serviceability design methods for cross laminated timber (CLT) floors

Simović, Nađa; Glišović, Ivan; Todorović, Marija

(ASES - Association of Structural Engineers of Serbia, 2022)

TY  - CONF
AU  - Simović, Nađa
AU  - Glišović, Ivan
AU  - Todorović, Marija
PY  - 2022
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2705
AB  - Cross laminated timber (CLT) is an innovative engineering wood product made by gluing layers of solid timber boards placed in orthogonally alternating orientation to the neighbouring layers. CLT panels provide an efficient solution for floors in single- and multi- storey buildings. Due to the light-weight and often long-span, design of these floors is generally governed by serviceability limit state criteria, that is deflection or vibration limits. Floor vibrations induced by dynamic actions, such as people walking, do not result in structural failure but may cause discomfort of occupants if the vibrations are not properly controlled. This paper gives an overview of some available methods for vibration serviceability design of residential CLT floors. Differences in considered parameters and limit values of these methods are discussed.
PB  - ASES - Association of Structural Engineers of Serbia
C3  - Proceedings of The International Congress ASES 2022
T1  - Vibration serviceability design methods for cross laminated timber (CLT) floors
EP  - 313
SP  - 302
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2705
ER  - 
@conference{
author = "Simović, Nađa and Glišović, Ivan and Todorović, Marija",
year = "2022",
abstract = "Cross laminated timber (CLT) is an innovative engineering wood product made by gluing layers of solid timber boards placed in orthogonally alternating orientation to the neighbouring layers. CLT panels provide an efficient solution for floors in single- and multi- storey buildings. Due to the light-weight and often long-span, design of these floors is generally governed by serviceability limit state criteria, that is deflection or vibration limits. Floor vibrations induced by dynamic actions, such as people walking, do not result in structural failure but may cause discomfort of occupants if the vibrations are not properly controlled. This paper gives an overview of some available methods for vibration serviceability design of residential CLT floors. Differences in considered parameters and limit values of these methods are discussed.",
publisher = "ASES - Association of Structural Engineers of Serbia",
journal = "Proceedings of The International Congress ASES 2022",
title = "Vibration serviceability design methods for cross laminated timber (CLT) floors",
pages = "313-302",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2705"
}
Simović, N., Glišović, I.,& Todorović, M.. (2022). Vibration serviceability design methods for cross laminated timber (CLT) floors. in Proceedings of The International Congress ASES 2022
ASES - Association of Structural Engineers of Serbia., 302-313.
https://hdl.handle.net/21.15107/rcub_grafar_2705
Simović N, Glišović I, Todorović M. Vibration serviceability design methods for cross laminated timber (CLT) floors. in Proceedings of The International Congress ASES 2022. 2022;:302-313.
https://hdl.handle.net/21.15107/rcub_grafar_2705 .
Simović, Nađa, Glišović, Ivan, Todorović, Marija, "Vibration serviceability design methods for cross laminated timber (CLT) floors" in Proceedings of The International Congress ASES 2022 (2022):302-313,
https://hdl.handle.net/21.15107/rcub_grafar_2705 .

Vibrational serviceability design method for timber floors according to Eurocode 5

Glišović, Ivan; Todorović, Marija; Simović, Nađa

(MASE - Macedonian Association of Structural Engineers, 2022)

TY  - CONF
AU  - Glišović, Ivan
AU  - Todorović, Marija
AU  - Simović, Nađa
PY  - 2022
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2670
AB  - Human-induced vibrations of timber floors are considered to be a serviceability issue that primarily
relates to discomfort of occupants. These vibrations are particularly problematic because they happen frequently and cannot be isolated. Vibration serviceability of timber floors is becoming more relevant due to increased demand for building new floor systems with larger spans. There are a number of different design methods with regard to vibration problems and there are a number of studies developed to improve these methods. This paper presents the design method for vibrational serviceability of timber floors proposed in Eurocode 5 Part 1-1. The vibrational parameters which need to be checked include fundamental frequency, unit point load deflection and unit impulse velocity response. The criteria defined in Eurocode 5 are regulated in the National annexes of each member country. Presentation and comparison of different design practices with regard to vibration performance of timber floors according to Eurocode 5 among European countries are made. Even though Eurocode 5 has given general criteria for vibrational serviceability design of timber floors, the design equations and design limits vary largely from country to country due to different tolerances for vibration disturbance as well as different construction practices. Design rules for human-induced floor vibrations in the current Eurocode 5 are predicated based on a correct philosophy but it remains to be demonstrated that these rules with some modifications can be applied beyond the context of traditional solid timber joist floors with decking.
PB  - MASE - Macedonian Association of Structural Engineers
C3  - Proceedings of MASE19
T1  - Vibrational serviceability design method for timber floors according to Eurocode 5
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2670
ER  - 
@conference{
author = "Glišović, Ivan and Todorović, Marija and Simović, Nađa",
year = "2022",
abstract = "Human-induced vibrations of timber floors are considered to be a serviceability issue that primarily
relates to discomfort of occupants. These vibrations are particularly problematic because they happen frequently and cannot be isolated. Vibration serviceability of timber floors is becoming more relevant due to increased demand for building new floor systems with larger spans. There are a number of different design methods with regard to vibration problems and there are a number of studies developed to improve these methods. This paper presents the design method for vibrational serviceability of timber floors proposed in Eurocode 5 Part 1-1. The vibrational parameters which need to be checked include fundamental frequency, unit point load deflection and unit impulse velocity response. The criteria defined in Eurocode 5 are regulated in the National annexes of each member country. Presentation and comparison of different design practices with regard to vibration performance of timber floors according to Eurocode 5 among European countries are made. Even though Eurocode 5 has given general criteria for vibrational serviceability design of timber floors, the design equations and design limits vary largely from country to country due to different tolerances for vibration disturbance as well as different construction practices. Design rules for human-induced floor vibrations in the current Eurocode 5 are predicated based on a correct philosophy but it remains to be demonstrated that these rules with some modifications can be applied beyond the context of traditional solid timber joist floors with decking.",
publisher = "MASE - Macedonian Association of Structural Engineers",
journal = "Proceedings of MASE19",
title = "Vibrational serviceability design method for timber floors according to Eurocode 5",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2670"
}
Glišović, I., Todorović, M.,& Simović, N.. (2022). Vibrational serviceability design method for timber floors according to Eurocode 5. in Proceedings of MASE19
MASE - Macedonian Association of Structural Engineers..
https://hdl.handle.net/21.15107/rcub_grafar_2670
Glišović I, Todorović M, Simović N. Vibrational serviceability design method for timber floors according to Eurocode 5. in Proceedings of MASE19. 2022;.
https://hdl.handle.net/21.15107/rcub_grafar_2670 .
Glišović, Ivan, Todorović, Marija, Simović, Nađa, "Vibrational serviceability design method for timber floors according to Eurocode 5" in Proceedings of MASE19 (2022),
https://hdl.handle.net/21.15107/rcub_grafar_2670 .