基于细观力学模型的三级配混凝土立方体试件单轴损伤数值分析

为分析混凝土细观结构在单轴荷载作用下的损伤演化过程，研究混凝土单轴破坏的宏观力学性能，基于细观力学模型，采用Marazs 损伤模型描述混凝土内部各相材料的本构关系，通过数值实验分析三级配混凝土立方体试件单轴破坏的宏观力学性能。数值实验结果表明：混凝土试件在单轴荷载作用下的损伤断裂是由于内部的初始损伤不断累积演变的结果，其数值实验的最终破坏形态与宏观层次上的破坏形态基本相似，粗骨料分布、粘结层厚度、粘结层和基体强度对混凝土宏观破坏具有一定的影响，说明该方法对混凝土细观结构破坏机制的分析合理、可靠。

Numerical analysis on uniaxial damage of cubic comcrete specimen with three grain-size levels based on micro-mechanical model

In order to study the damage evolution process of mesoscopic structure and macro-mechanical properties of concrete under uniaxial load, it conducts numerical experiment to analyze the macro-mechanical properties of uniaxial damage of cubic concrete specimen with three grain-size levels by applying Marazs damage model to describe constitutive relation of concrete materials. The numerical experiment results show that the damage of concrete specimen under uniaxical load fracture resulted from the continuous accumulation and evolution of internal initial damge, the final failure pattern of numerical experiments is basically similar to the damage form from the micro level, the aggregate distribution, the thickness of adhesive layer, adhesive layer and matrix strength have a certain impact on concrete maceoscopic damage, it shows that the method is reasonable and reliable for the analysis of the failure mechanism of conerete mesoscopic structure.