Stress-strain constitutive equations of concrete material at elevated temperatures

Long Yuan Li*, John Purkiss

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

The paper presents a critical review of the currently available models for the mechanical behaviour of concrete at elevated temperatures. Based on these models and experimental data a stress-strain-temperature model is proposed which incorporates the effect of transient strain implicitly. This model can be easily incorporated into existing commercial finite element analysis software. A numerical example on a wall element heated on two opposite faces indicates that at very early stages of heating transient strain does not play an important part, but that as the exposure time increases the effect of ignoring transient strain progressively increases and produces unconservative estimates of load carrying capacity.

Original languageEnglish
Pages (from-to)669-686
Number of pages18
JournalFire Safety Journal
Volume40
Issue number7
DOIs
Publication statusPublished - 1 Oct 2005

Fingerprint

constitutive equations
Constitutive equations
Concretes
transient heating
load carrying capacity
Temperature
temperature
Load limits
computer programs
Finite element method
Heating
estimates

Keywords

  • Concrete
  • Fire
  • Fire performance
  • Stress-strain relation
  • Transient strain

Cite this

Li, Long Yuan ; Purkiss, John. / Stress-strain constitutive equations of concrete material at elevated temperatures. In: Fire Safety Journal. 2005 ; Vol. 40, No. 7. pp. 669-686.
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Stress-strain constitutive equations of concrete material at elevated temperatures. / Li, Long Yuan; Purkiss, John.

In: Fire Safety Journal, Vol. 40, No. 7, 01.10.2005, p. 669-686.

Research output: Contribution to journalArticle

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AU - Purkiss, John

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AB - The paper presents a critical review of the currently available models for the mechanical behaviour of concrete at elevated temperatures. Based on these models and experimental data a stress-strain-temperature model is proposed which incorporates the effect of transient strain implicitly. This model can be easily incorporated into existing commercial finite element analysis software. A numerical example on a wall element heated on two opposite faces indicates that at very early stages of heating transient strain does not play an important part, but that as the exposure time increases the effect of ignoring transient strain progressively increases and produces unconservative estimates of load carrying capacity.

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