Nonlinear numerical modeling of two-way reinforced concrete slabs subjected to fire

► The transient strain model of concrete under the biaxial stress state is proposed. ► A concept of the transient modulus is put forward. ► A failure criterion for determining the fire resistance of the slab is suggested. ► Three-stage response mode of the slab subjected to fire is revealed and simu...

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Bibliographic Details
Published in:Computers & structures 2013-04, Vol.119, p.23-36
Main Authors: Wang, Yong, Dong, Yu-li, Zhou, Guang-chun
Format: Article
Language:English
Subjects:
Concretes
Creep strain
Fire resistance
Fires
Mathematical models
Reinforced concrete
Reinforced concrete slabs
Reinforcing steels
Slabs
Strain
Thermal strain
Thermal-elastic–plastic
Transient strain
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Summary:► The transient strain model of concrete under the biaxial stress state is proposed. ► A concept of the transient modulus is put forward. ► A failure criterion for determining the fire resistance of the slab is suggested. ► Three-stage response mode of the slab subjected to fire is revealed and simulated. This paper proposes a transient strain model of concrete with a transient modulus under the biaxial stress state and a failure criterion for determining the fire resistance of two-way reinforced concrete slabs. A program was developed to calculate the three-stage response mode and fire resistance of such slabs. Unlike tests and past studies, this program verified the developed constitutive model of concrete and the necessity of including transient strain in the model. The parametric study included in this research further specified the influence of concrete’s thermal strain and steel’s creep strain on the behavior of the slab during fires.
ISSN:0045-7949
1879-2243
DOI:10.1016/j.compstruc.2012.12.029