混凝土细观分析中随机多边形骨料生成方法

Generating Method of Random Polygon Aggregate in Mesoscopic Simulation of Concrete

提出了一种以改进面积判别准则和凸多边形生成方式为基础的二维混凝土骨料随机生成算法。通过对骨料延伸条件的改进和定点位置条件的限定,改进了程序的可执行性,提高了随机多边形骨料的生成效率;通过轴向拉压计算实例对比分析了圆形和多边形骨料对于混凝土试件单轴抗拉、抗压力学性能的影响。结果表明:圆形骨料试件抗拉、抗压能力略高于多边形骨料试件,骨料形状对混凝土试件拉压力学性能数值模拟结果的影响很小。

An improved generating method of random concrete aggregates in 2-D area based on area criteria and generating pattern was proposed. Through improving aggregate extension condition and limiting the condition of special point＇s location, the generation efficiency of random polygon aggregates was raised, and the computational program was subsequently improved. Finally, through comparing the calculation examples under axial tension and compression, the influences of mechanical properties on concrete specimens under uniaxial tension and compression were analyzed by comparing the different shapes of aggregates, such as circular aggregate and polygon aggregate. The result shows that the concrete specimens with circular aggregates have slightly higher strength than that of polygon aggregates, which also indicates that shape of aggregate has little effect on the tensile and compressive mechanical properties of concrete specimens in terms of the numerical simulation results.