动荷载下沙漠砂混凝土破坏过程数值模拟  

Numerical simulation of dynamic failure of desert sand concrete

作　　者：王亿颖 周姝航 刘海峰[1] 宋建夏[1] 

机构地区：[1]宁夏大学土木与水利工程学院,宁夏银川750021

出　　处：《混凝土》2016年第10期69-71,76,共4页Concrete

基　　金：国家自然基金(11162015;51368048);教育部"长江学者和创新团队发展计划"创新团队项目(IRT1067);宁夏旱区节水灌溉与水资源调控中心和旱区现代农业水资源高效利用教育部工程研究中心资助项目

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。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 ram, the peak stress of desert sand concrete declines with the maximum value of particle size of coarse aggregate.The peak stress of desert sand con- crete increases firstly, then declines with the volume fraction of coarse aggregate.

关 键 词：沙漠砂混凝土 数值模拟 动态特性 

分 类 号：TU528.041[建筑科学—建筑技术科学]