基于Coulomb准则的混凝土塑性损伤本构模型及其数值验证

以连续介质不可逆热力学为基础，采用了Mohr-Coulomb屈服准则，提出混凝土塑性损伤耦合的新的本构方程。在该模型中采用了塑性应变 、各向同性损伤标量D作为内变量。这个新的本构关系模型严格满足热力学的基本方程。以不同围压作用下混凝土试件的单轴压缩行为为例，采用开发的程序进行了局部水平上本构模型数值验证。结果表明，模型损伤演化数值结果符合试验趋势。

A Coulomb-plasticity based damage model for concrete and its numerical validation

A new elastoplastic constitutive model is presented in the framework of continiuum irreversible thermodynamics. The Mohr-Coulomb criterion is adopted. There are three internal variables adopted in this model: plastic strain , isotropic scalar damage variable D which describes the character of damage. The new constitutive relations strictly satisfy the basic requirement of thermodynamically consistent theory. Numerical validation of the prposed constitutive model has been carried out at local level. Uniaxial compression of concrete specimen under various confining pressures has been simulated. Results indicate the effectiveness of the proposed model.