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Tension stiffening model for the finite element analysis of composite floor systems exposed to fire

Tension stiffening model for the finite element analysis of composite floor systems exposed to fire A methodology for producing an elevated-temperature tension stiffening model is presented.Design/methodology/approachThe energy-based stress–strain model of plain concrete developed by Bažant and Oh (1983) was extended to the elevated-temperature domain by developing an analytical formulation for the temperature-dependence of the fracture energy Gf. Then, an elevated-temperature tension stiffening model was developed based on the modification of the proposed elevated-temperature tension softening model.FindingsThe proposed tension stiffening model can be used to predict the response of composite floor slabs exposed to fire with great accuracy, provided that the global parameters TS and Kres are adequately calibrated against global structural response data.Originality/valueIn a finite element analysis of reinforced concrete, a tension stiffening model is required as input for concrete to account for actions such as bond slip and tension stiffening. However, an elevated-temperature tension stiffening model does not exist in the research literature. An approach for developing an elevated-temperature tension stiffening model is presented. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Structural Fire Engineering Emerald Publishing

Tension stiffening model for the finite element analysis of composite floor systems exposed to fire

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Publisher
Emerald Publishing
Copyright
© Emerald Publishing Limited
ISSN
2040-2317
DOI
10.1108/jsfe-10-2021-0065
Publisher site
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Abstract

A methodology for producing an elevated-temperature tension stiffening model is presented.Design/methodology/approachThe energy-based stress–strain model of plain concrete developed by Bažant and Oh (1983) was extended to the elevated-temperature domain by developing an analytical formulation for the temperature-dependence of the fracture energy Gf. Then, an elevated-temperature tension stiffening model was developed based on the modification of the proposed elevated-temperature tension softening model.FindingsThe proposed tension stiffening model can be used to predict the response of composite floor slabs exposed to fire with great accuracy, provided that the global parameters TS and Kres are adequately calibrated against global structural response data.Originality/valueIn a finite element analysis of reinforced concrete, a tension stiffening model is required as input for concrete to account for actions such as bond slip and tension stiffening. However, an elevated-temperature tension stiffening model does not exist in the research literature. An approach for developing an elevated-temperature tension stiffening model is presented.

Journal

Journal of Structural Fire Engineering – Emerald Publishing

Published: Feb 15, 2023

Keywords: Tension stiffening; Tension softening; Fracture energy; Average stress–strain relationship; Steel-concrete composite floor slabs; Finite element analysis

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