中文摘要：

用细观分析来模拟混凝土立方体劈裂试验的力学特性,常将混凝土看成由粗骨料、砂浆质和界面过渡区组成的三相复合材料。为了研究骨料形状对混凝土劈拉试验的影响,三组18个数值试件被用来进行劈裂计算。对于砂浆基体和界面过渡区使用损伤塑性模型,骨料则假设为线弹性体。数值模拟结果体现了混凝土宏观力学响应的非线性特性,反映出混凝土骨料形状对劈拉结果的微小影响,证明了劈拉强度与试验数据基本吻合。此外,还讨论了不同加载垫条宽度对劈拉强度的影响。

英文摘要：

A meso-scale analysis is performed to simulate the mechanical properties of concrete in the splitting test on cube specimens . The influence of aggregate shape on the splitting test in concrete is considered .For this purpose ,eighteen simples in three groups with different aggregate particle shapes are generated by a meso-scale approach ,which treats the concrete as a three-phase composite materials consisting of coarse aggregate grains surrounded by an interfacial transition zone embedded in the mortar matrix .A damage plasticity model is applied to the mortar matrix and interfacial transition zone whereas the aggregates are assumed to behave in the form of linear elastic .The macroscopic mechanical response of concrete in splitting tests represents the nonlinearity in the results ob‐tained from the numerical simulation .These splitting strengths agree well with available experimental data and show a slight depend‐ence on the aggregate shape .Additionally ,the effect of different loading strip widths on the splitting strength of concrete is i dis‐cussed .