Finite Element Modelling of Reinforced Concrete Slab Exposed to Extreme Fire Loads

Transactions of the VSB-Technical University of Ostrava. Civil Engineering Series

article

Daniel Jindra,¹  Petr Hradil¹ 

[1] Institute of Structural Mechanics, Faculty of Civil Engineering, Brno University of Technology

关键词: Extreme loads;    mechanical fire resistance;    MenetreyWillam material model;    numerical nonlinear analysis;    reinforced slab structure;    transient fire response.;   

DOI  :  10.35181/tces-2019-0012

来源: Walter de Gruyter GmbH

【 摘 要 】

Numerical approach using the finite element method has been used to determine the mechanical resistance (criterion R) of a reinforced concrete structure exposed to fire. Geometry of the structure is considered as a simply supported slab in one dimension. Fire load has been defined by a nominal standard ISO 834 fire curve. Both, thermal and structural response are obtained using a finite element method software ANSYS. Temperature-dependent nonlinear thermal and mechanical properties of concrete and reinforcement are adopted in accordance with Eurocode standards. Nonlinear material model Menetrey-Willam with exponential functions for compression hardening (and softening) and tension softening has been used to describe the behaviour of concrete elements. Discrete option of modelling reinforcement has been considered. Mechanical resistance of the slab is determined by reaching the limit mid-span deformation. Results have been compared with simplified method of isotherm 500 °C described in Eurocode.

【 授权许可】

Unknown