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

Jason Martinez (Department of Civil and Environmental Engineering, University of Michigan, Ann Arbor, Michigan, USA)
Ann Jeffers (Department of Civil and Environmental Engineering, University of Michigan, Ann Arbor, Michigan, USA)

Journal of Structural Fire Engineering

ISSN: 2040-2317

Article publication date: 21 March 2022

Issue publication date: 15 February 2023

108

Abstract

Purpose

A methodology for producing an elevated-temperature tension stiffening model is presented.

Design/methodology/approach

The 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.

Findings

The 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/value

In 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.

Keywords

Acknowledgements

The work presented was supported in part by funding from the Department of Civil and Environmental Engineering at the University of Michigan, the University of Michigan Rackham Engineering Award (REA) and the US National Science Foundation (NSF) through Grant No. DGE 1256260 and Grant No. CMMI 1253440. This research was also supported in part through computational resources and services provided by the University of Michigan's Advanced Research Computing (ARC) Flux HPC cluster.

Disclaimer: Certain commercial entities, products or materials are identified in this document to describe a procedure or concept adequately. Such identification is not intended to imply recommendation, endorsement or implication that the entities, product or materials are necessarily the best available for the purpose.

Citation

Martinez, J. and Jeffers, A. (2023), "Tension stiffening model for the finite element analysis of composite floor systems exposed to fire", Journal of Structural Fire Engineering, Vol. 14 No. 1, pp. 34-60. https://doi.org/10.1108/JSFE-10-2021-0065

Publisher

:

Emerald Publishing Limited

Copyright © 2022, Emerald Publishing Limited

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