中文摘要：

以连续介质力学和不可逆热力学为基础，提出了新的混凝土弹塑性损伤本构模型．在该模型中采用了塑性应变εp、各向同性损伤标量D以及应变梯度Δε作为内变量，其中应变梯度反应了损伤的非局部性质，本模型是梯度依赖的非局部损伤模型，严格满足热力学的基本方程．应用梯度依赖弹塑性非局部损伤本构模型得出的结果比已有的混凝土损伤塑性模型更为合理．

英文摘要：

A new elastoplastic constitutive model is presented in the framework of irreversible thermodynamics. There are three internal variables in this model, i.e. plastic strain εp, isotropic damage variable D and strain gradient Δε which describes the nonlocal character of damage, thus this is a gradientdependent model. The new constitutive relations strictly meet the basic formulations of thermodynamically consistent theory. Results obtained by gradient-dependent nonlocal damage model are more reasonable than the existing results obtained by convetional damamge model coupled with plasticity for concrete.