Abstract：A coupled elastoplastic-damage constitutive model for the numerical simulation of realistic failure in concretes at high temperature is developed in this paper. A general direct stress return mapping algorithm, using Newton-Raphson iteration, is derived. The stress vector and scalar internal state variables quantifying the incremental plasticity and damage are updated simultaneously. The consistent tangent modulus matrices for coupled chemo-thermo-hygro-mechanical analysis are formulated for use in the global Newton iterative procedure. A solution procedure with two hierarchical phases for the coupled elastoplastic-damage analysis is proposed. Numerical examples are given to demonstrate the validity of the presented algorithm and formulations, illustrate the capability of the proposed constitutive model in reproducing coupled chemo-thermo-hygro-mechanical behavior in concrete wall subjected to fire and thermal radiation.
2011, Vol. 32 
