冲击载荷作用下混凝土的率型本构关系

Rate Dependent Constitutive Relations of Concrete Under Impact Load

为了再混凝土冲击实验结果的基础上得到率相关的木构关系,从混凝土材料的变形特点出发,分析了骨料、水泥浆体及处于不同受力阶段的微裂纹对混凝土变形的影响,认为混凝土材料属于粘弹性材料,适用于朱-王-唐模型。在考虑混凝土小应变和易损伤的特点的同时,采用修改后的五参数线性朱-王-唐损伤模型对实验结果进行1-0 5/s至102/s应变率范围内的混凝土率效应本构拟合,取得了与实验结果较吻合的效果。

Based on test data and deformation property of concrete material, the influence of coarse aggregate, cement grout and micro-cracks in different phase of loading on concrete deformation were analyzed. Concrete is considered as viscoelastic material and Zhu-Wang-Tang model is applicable for it. Considering that concrete is hardly-deformable and damageable, revised 5-parameter linear Zhu-Wang -Tang damage model was used to fit rate dependent constitutive relations of concrete, which strain rate is between 10^-5/s and 10^2/s. The results have good accord with test data.