一种高温下混凝土化学塑性-损伤耦合本构模型

提出了一个用于模拟高温下混凝土化学塑性-损伤耦合本构行为的数值模型。发展了一个化学塑性-损伤耦合分析的一致性应力返回映射算法。为了保证对于全局守恒方程Newton迭代过程的2阶收敛率，推导并形成了一致性切线模量矩阵。数值算例显示了文中发展的化学塑性-损伤耦合本构模型在模拟高温下混凝土中复杂破坏过程的能力和有效性。

A coupled chemoplastic-damage constitutive model for plain concrete subjected to high temperature

A coupled chemoplastic-damage constitutive model for the simulation of coupled chemo-thermo-hygro-mechanical behavior of concretes at high temperature is proposed. A consistent return mapping algorithm for the integration of the rate coupled constitutive equations is developed. Consistent tangent modulus matrices for coupled chemo-thermo-hygro-mechanical analysis are derived to preserve the quadratic rate of convergence of the global Newton iterative procedure. Numerical results demonstrate that the proposed constitutive model in reproducing coupled chemo-thermo-hygro-mechanical behavior of concretes subjected to fire and thermal radiation is available and effective.