【摘要】 动荷载作用下沙漠砂混凝土力学特性非常复杂,编写了沙漠砂混凝土二维粗骨料随机分布程序,对沙漠砂混凝土力学特性和破坏形态进行模拟,分析粗骨料粒径大小和体积含量对沙漠砂混凝土动态力学性能影响。数值模拟表明:随着粗骨料颗粒最小粒径增大,沙漠砂混凝土峰值应力逐渐减小;粗骨料颗粒最大粒径小于20 mm时,随着粗骨料颗粒最大粒径增大,沙漠砂混凝土峰值应力呈逐渐增大趋势,粗骨料颗粒最大粒径大于20 mm时,随着粗骨料颗粒最大粒径增大,沙漠砂混凝土峰值应力呈逐渐减小趋势;随着沙漠砂混凝土粗骨料体积含量增加,沙漠砂混凝土峰值应力呈先增大后减小趋势。更多还原

【Abstract】 Dynamic mechanical behaviors of desert sand concrete are very complex.A two-dimensional aggregate random distribution program of desert sand concrete was designed to simulate the dynamic response of desert sand concrete.The influences of particle size and volume fraction of coarse aggregate on the dynamic mechanical behavior of desert sand concrete were analyzed.Numerical simulation shows that the peak stress of desert sand concrete declines with the minimum value of particle size of coarse aggregate.When the maximum value of particle size of coarse aggregate being less than 20 mm,the peak stress of desert sand concrete increases with the maximum value of particle size of coarse aggregate.Whereas,when the maximum value of particle size of coarse aggregate being more than 20 mm,the peak stress of desert sand concrete declines with the maximum value of particle size of coarse aggregate.The peak stress of desert sand concrete increases firstly,then declines with the volume fraction of coarse aggregate.更多还原