TY  - CONF
AU  - Tošić, Nikola
AU  - Pecić, Nenad
AU  - Marí, Antonio
AU  - Torres, Lluis
AU  - Dragaš, Jelena
AU  - Poliotti, Mauro
PY  - 2021-06-14
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3193
AB  - Deflection control of two-way slabs is a very complex task considering their possible geometries, structural systems, reinforcement layouts and loading histories, as well as the large number of influencing parameters and moment redistribution due to cracking and time-dependent effects of creep and shrinkage. As a consequence, sufficiently simple and accurate methods for deflection control of two-way reinforced concrete slabs have are still missing. In order to fill this gap, a novel method was developed as an adaptation of the ζ-method (as defined by the fib Model Code 2010) of interpolating deflections between the uncracked and fully cracked state. The method is based on deflections obtained using linear-elastic analyses in finite element software, which are then transformed through a series of stiffness normalizations to obtain time-dependent deflections due to load and shrinkage. Furthermore, the moment redistribution capacity of two-way slabs is accounted for through adjustments of the interpolation coefficient ζ. The method is tested against available experimental results from literature and compared with results obtained using existing methods such as the crossing beam method. The results show good precision and accuracy of the proposed method and an improvement compared with existing methods.
C3  - fib Symposium. "Concrete Structure: New Trends for Eco-Efficiency and Performance: 18th fib Symposium proceedings"
T1  - Development and assessment of a modified ζ-method for deflection control of two-way slabs
EP  - 1557
SP  - 1549
UR  - https://hdl.handle.net/21.15107/rcub_grafar_3193
ER  - 

@conference{
author = "Tošić, Nikola and Pecić, Nenad and Marí, Antonio and Torres, Lluis and Dragaš, Jelena and Poliotti, Mauro",
year = "2021-06-14",
abstract = "Deflection control of two-way slabs is a very complex task considering their possible geometries, structural systems, reinforcement layouts and loading histories, as well as the large number of influencing parameters and moment redistribution due to cracking and time-dependent effects of creep and shrinkage. As a consequence, sufficiently simple and accurate methods for deflection control of two-way reinforced concrete slabs have are still missing. In order to fill this gap, a novel method was developed as an adaptation of the ζ-method (as defined by the fib Model Code 2010) of interpolating deflections between the uncracked and fully cracked state. The method is based on deflections obtained using linear-elastic analyses in finite element software, which are then transformed through a series of stiffness normalizations to obtain time-dependent deflections due to load and shrinkage. Furthermore, the moment redistribution capacity of two-way slabs is accounted for through adjustments of the interpolation coefficient ζ. The method is tested against available experimental results from literature and compared with results obtained using existing methods such as the crossing beam method. The results show good precision and accuracy of the proposed method and an improvement compared with existing methods.",
journal = "fib Symposium. "Concrete Structure: New Trends for Eco-Efficiency and Performance: 18th fib Symposium proceedings"",
title = "Development and assessment of a modified ζ-method for deflection control of two-way slabs",
pages = "1557-1549",
url = "https://hdl.handle.net/21.15107/rcub_grafar_3193"
}

Tošić, N., Pecić, N., Marí, A., Torres, L., Dragaš, J.,& Poliotti, M.. (2021-06-14). Development and assessment of a modified ζ-method for deflection control of two-way slabs. in fib Symposium. "Concrete Structure: New Trends for Eco-Efficiency and Performance: 18th fib Symposium proceedings", 1549-1557.
https://hdl.handle.net/21.15107/rcub_grafar_3193

Tošić N, Pecić N, Marí A, Torres L, Dragaš J, Poliotti M. Development and assessment of a modified ζ-method for deflection control of two-way slabs. in fib Symposium. "Concrete Structure: New Trends for Eco-Efficiency and Performance: 18th fib Symposium proceedings". 2021;:1549-1557.
https://hdl.handle.net/21.15107/rcub_grafar_3193 .

Tošić, Nikola, Pecić, Nenad, Marí, Antonio, Torres, Lluis, Dragaš, Jelena, Poliotti, Mauro, "Development and assessment of a modified ζ-method for deflection control of two-way slabs" in fib Symposium. "Concrete Structure: New Trends for Eco-Efficiency and Performance: 18th fib Symposium proceedings" (2021-06-14):1549-1557,
https://hdl.handle.net/21.15107/rcub_grafar_3193 .

TY  - JOUR
AU  - Tošić, Nikola
AU  - Pecić, Nenad
AU  - Poliotti, Mauro
AU  - Marí, Antonio
AU  - Torres, Lluis
AU  - Dragaš, Jelena
PY  - 2021
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2964
AB  - Deflections are among the most complex aspects of reinforced concrete behavior.
Furthermore, deflection control is increasingly a governing criterion in
design, especially in the case of two-way members such as flat slabs or edgesupported
slabs. However, simple and theoretically sound and adequately verified
methods for calculating deflections of two-way reinforced concrete members
have been lacking. Therefore, in this study, a novel method is proposed
for deflection control of two-way slabs. The method is an extension of the
ζ-method (as defined by Eurocode 2 and the fib Model Code 2010) of interpolating
deflections between the uncracked and fully cracked state. As a basis,
the method uses elastic deflections that are obtained through linear elastic
analyses in finite element software. The elastic deflection is then adequately
transformed based on the properties of a representative section, to account for
cracking, shrinkage and creep according to a modified version of the ζ-method.
Finally, the method is validated against available experimental results from literature,
obtaining satisfactory precision and accuracy. The method proposed
in this study aims at providing an easy-to-use tool for designers carrying out
deflection control of two-way reinforced concrete slabs.
PB  - wileyonlinelibrary.com
PB  - fib. International Federation for Structural Concrete
T2  - Structural Concrete
T1  - Extension of the ζ-method for calculating deflections of two-way slabs based on linear elastic finite element analysis
IS  - 1-19
DO  - 10.1002/suco.202000558
ER  - 

@article{
author = "Tošić, Nikola and Pecić, Nenad and Poliotti, Mauro and Marí, Antonio and Torres, Lluis and Dragaš, Jelena",
year = "2021",
abstract = "Deflections are among the most complex aspects of reinforced concrete behavior.
Furthermore, deflection control is increasingly a governing criterion in
design, especially in the case of two-way members such as flat slabs or edgesupported
slabs. However, simple and theoretically sound and adequately verified
methods for calculating deflections of two-way reinforced concrete members
have been lacking. Therefore, in this study, a novel method is proposed
for deflection control of two-way slabs. The method is an extension of the
ζ-method (as defined by Eurocode 2 and the fib Model Code 2010) of interpolating
deflections between the uncracked and fully cracked state. As a basis,
the method uses elastic deflections that are obtained through linear elastic
analyses in finite element software. The elastic deflection is then adequately
transformed based on the properties of a representative section, to account for
cracking, shrinkage and creep according to a modified version of the ζ-method.
Finally, the method is validated against available experimental results from literature,
obtaining satisfactory precision and accuracy. The method proposed
in this study aims at providing an easy-to-use tool for designers carrying out
deflection control of two-way reinforced concrete slabs.",
publisher = "wileyonlinelibrary.com, fib. International Federation for Structural Concrete",
journal = "Structural Concrete",
title = "Extension of the ζ-method for calculating deflections of two-way slabs based on linear elastic finite element analysis",
number = "1-19",
doi = "10.1002/suco.202000558"
}

Tošić, N., Pecić, N., Poliotti, M., Marí, A., Torres, L.,& Dragaš, J.. (2021). Extension of the ζ-method for calculating deflections of two-way slabs based on linear elastic finite element analysis. in Structural Concrete
wileyonlinelibrary.com.(1-19).
https://doi.org/10.1002/suco.202000558

Tošić N, Pecić N, Poliotti M, Marí A, Torres L, Dragaš J. Extension of the ζ-method for calculating deflections of two-way slabs based on linear elastic finite element analysis. in Structural Concrete. 2021;(1-19).
doi:10.1002/suco.202000558 .

Tošić, Nikola, Pecić, Nenad, Poliotti, Mauro, Marí, Antonio, Torres, Lluis, Dragaš, Jelena, "Extension of the ζ-method for calculating deflections of two-way slabs based on linear elastic finite element analysis" in Structural Concrete, no. 1-19 (2021),
https://doi.org/10.1002/suco.202000558 . .