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中文摘要：
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。
英文摘要：
Concrete is regarded as a non-homogeneous composite consisting of cement mortar and coarse aggregate. A plane two-gradation circular aggregate random distribution program of concrete is designed to simulate the dynamic properties of concretes. The influences of middle size and maximum size of coarse aggregate on the dynamic properties of concretes are analyzed. Numerical simulation shows that the peak stress of concrete increases firstly, then declines with the medium size of coarse aggregate. When the medium size of coarse aggregate is equal to 15 mm, the peak stress of concrete reaches maximum value. However, the peak stress of concrete declines with the maximum value of coarse aggregate.
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