中文摘要：

为了研究混凝土的细观力学性能，利用MATLAB自编程序建立混凝土多边形随机骨料模型，采用最大限定边长和最小限定边长控制多边形骨料生成，并将随机骨料模型导入Comsol软件，建立混凝土细观模型，最后对三级配混凝土轴拉破坏进行数值模拟分析。分析结果表明，该混凝土细观模型算法合理可靠、简单易行，数值计算结果与宏观混凝土轴拉试验结果相符。可为混凝土的非线性有限元分析及力学性能试验改进提供理论依据。

英文摘要：

To research the mesoscopic mechanical properties of concrete, the random polygon aggregate model of concrete was built by using the self-compiling program based on MATLAB, and the maximum and minimum limit length is used to control the formation of polygonal aggregate. Then the concrete mesoscopic model is established by importing the random polygon aggregate model into the Comsol. Finally, the uniaxial destruction of three-graded concrete is numerically simulated. The analysis results show that the algorithm is reasonable, reliable, convenient and feasible. The numerical calculation results are in conformity with the uniaxial tension test results.