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将混凝土看作水泥砂浆与粗骨料组成的非均质复合材料。编写二级配圆形骨料混凝土随机投放程序对混凝土动态破坏过程进行数值模拟,分析粗骨料颗粒中间粒径和最大粒径对二级配混凝土动态特性的影响。数值模拟结果表明:随着粗骨料颗粒中间粒径的增加,混凝土在动荷载作用下峰值应力先增大,然后逐渐减小,粗骨料颗粒中间粒径为15mm时,峰值应力达到最大;随着二级配混凝土粗骨料颗粒粒径最大值的增加,混凝土在动荷载下峰值应力逐渐减小。
The concrete is regarded as the heterogeneous composite material composed of cement mortar and coarse aggregate. The second-order circular random aggregate concrete was put into random program to simulate the dynamic failure process of concrete. The influence of the middle particle size and the maximum particle size on the dynamic characteristics of secondary concrete was analyzed. The numerical simulation results show that the peak stress of concrete increases first and then decreases with the increase of the middle particle size of coarse aggregate particles, and the peak stress reaches the maximum when the middle particle size of coarse aggregate particles is 15mm. With the increase of the maximum particle size of coarse aggregates of secondary concrete, the peak stress of concrete gradually decreases under dynamic load.