中文说明：为了研究混凝土细观力学现象,对混凝土力学行为进行数值模拟,采用二维细观结构数值模拟骨料随机投放,为进行混凝土有限元细观力学分析提供了数值结构模型.采用matlab软件建立了混凝土骨料随机投放模型,其中考虑混凝土为由骨料、砂浆及二者之间的黏结界面组成的三相复合材料,在投放过程中,以骨料面积比例为基本参数、黏结界面厚度取骨料半径的5%.自编函数绘制骨料形状,并分析了用正多边形代替圆形骨料的误差.建立的骨料随机模型原理简单、思路清晰,结果满足随机性要求.最后分别使用二级配混凝土和三级配混凝土算例进行验证.关键词:混凝土;二维模型;细观结构;骨料随机投放;数值模拟
English Description：
In order to study the meso mechanical phenomenon of concrete, the mechanical behavior of concrete is numerically simulated. The two-dimensional meso structure is used to simulate the random placement of aggregate, which provides a numerical structure model for the finite element meso mechanical analysis of concrete, The concrete is considered as a three-phase composite material composed of aggregate, mortar and the bonding interface between them. In the process of placing, the aggregate area ratio is taken as the basic parameter, and the bonding interface thickness is taken as 5% of the aggregate radius. The aggregate shape is drawn by self-made function, and the error of using positive polygon instead of circular aggregate is analyzed, The results meet the requirements of randomness. Finally, two graded concrete and three graded concrete examples are used to verify the results