Coupled thermo-hygro-mechanical damage model for concrete subjected to high temperatures |
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Authors: | Zhong-you Li Yuan-xue Liu |
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Institution: | Department of Architectural and Civil Engineering, Logistical Engineering University, Chongqing 401311, P. R. China |
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Abstract: | Based on the theory of mixtures, a coupled thermo-hygro-mechanical (THM) damage model for concrete subjected to high temperatures
is presented in this paper. Concrete is considered as a mixture composed of solid skeletons, liquid water, water vapor, dry
air, and dissolved air. The macroscopic balance equations of the model consist of the mass conservation equations of each
component and the momentum and energy conservation equations of the whole medium mixture. The state equations and the constitutive
model used in the model are given. Four final governing equations are given in terms of four primary variables, i.e., the
displacement components of soil skeletons, the gas pressure, the capillary pressure, and the temperature. The processes involved
in the coupled model include evaporation, dehydration, heat and mass transfer, etc. Through the process of deformation failure
and the energy properties, the mechanics damage evolution equations are established based on the principle of conversation
of energy and the Lemaitre equivalent strain assumption. Then, the influence of thermal damage on the mechanical property
is considered. |
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Keywords: | concrete high temperature thermo-hygro-mechanical (THM) damage model |
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