Development and assessment of a modified ζ-method for deflection control of two-way slabs
Само за регистроване кориснике
2021
Конференцијски прилог (Нерецензирана верзија)
,
Féderation Internationale du Béton (fib)
Метаподаци
Приказ свих података о документуАпстракт
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.
Кључне речи:
deflection / two-way slab / serviceability / finite element method / Model CodeИзвор:
fib Symposium. "Concrete Structure: New Trends for Eco-Efficiency and Performance: 18th fib Symposium proceedings", 14-06-2021, 1549-1557Институција/група
GraFarTY - 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 .