Thermo-mechanical Coupling Constitutive Model of Concrete Based on Thermodynamics

LI Liang; LI Yan

doi:10.11936/bjutxb2015030070

Journal of Beijing University of Technology > 2016 > 42(4): 554-560. > DOI: 10.11936/bjutxb2015030070

LI Liang, LI Yan. Thermo-mechanical Coupling Constitutive Model of Concrete Based on Thermodynamics[J]. Journal of Beijing University of Technology, 2016, 42(4): 554-560. DOI: 10.11936/bjutxb2015030070

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Thermo-mechanical Coupling Constitutive Model of Concrete Based on Thermodynamics

LI Liang,
LI Yan

The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology, Beijing 100124,China

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Received Date: March 22, 2015
Available Online: January 10, 2023

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Abstract

Abstract

In order to describe the mechanical properties of concrete under high temperature,a thermomechanical model for concrete with the influence of temperature was presented in this paper. It based on thermodynamic theory and combined the damage theory with the classic elasto-plastic theory,which was used to describe the mechanical properties of concrete under high temperature. Firstly,the elastic strain increment under elevated temperature was derived on the basis of the rmodynamic principle. Then,a hardening parameter based on the classical plastic theory was constructed,with consideration of the influence of temperature. A plastic strain increment expression was obtained. With superposition of the two part strain increment, the expression of thermal-mechanical coupling constitutive model was established. The model was calibrated with the experimental results. It proves that the thermalmechanical coupling constitutive model can more accurately describe the mechanical properties of concrete under high temperature.
- concrete,
- thermo-mechanical coupling,
- constitutive model,
- thermodynamics,
- plastic damage

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References

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