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| Constitutive modeling of concrete at high temperature and failure analysis |
| Revised:June 02, 2005 |
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| DOI：10.7511/jslx20075108 |
| KeyWord:coupled chemo-thermo-hydro-mechanical processes,constitutive modeling,concrete,high temperature |
| LI Rong-tao LI Xi-kui |
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| Abstract: |
| A coupled chemo-thermo-hydro-mechanical(CTHM) constitutive model for concretes is developed for the hierarchical mathematical model in the coupled chemo-thermo-hydro-mechanical analysis of concretes at high temperature.Based on the existing elasto-plastic Willam-Warnke yield criterion,a generalized Willam-Warnke yield criterion with consideration of material damage and chemo-plastic softening due to the dehydration and the desalinization,plastic strain hardening/softening and suction hardening is developed to simulate the non-linear material behavior of concretes at high temperature.Consistent tangent modulus matrices for coupled non-linear chemothermo-hydro-mechanical constitutive modeling are formulated to ensure the second order convergence rate for the Newton iterative procedure of the global balance equations.The numerical results demonstrate the capability and the validity of the proposed coupled CTHM constitutive model in simulating the complex failure processes in concretes at high temperature. |
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