摘要
骨料是混凝土重要组成部分,对混凝土力学性能有很大影响。利用有限元软件ANSYS/LS-DYNA,对二级配凸多边形骨料随机分布混凝土动态特性进行数值模拟,分析凸多边形粗骨料体积含量、粒径大小和试件尺寸对二级配混凝土动态特性的影响规律。结果表明:二级配凸多边形骨料随机分布混凝土表现出率敏感性和尺寸效应;二级配混凝土承载能力随粗骨料最大粒径的增大而降低;随着粗骨料中间粒径和粗骨料体积含量增大,二级配混凝土承载能力呈先增大后降低趋势;随粗骨料最小粒径的增大,二级配混凝土承载能力逐渐降低。
Coarse aggregate is an important part of concrete and has great influence on the mechanical properties of concrete.Using finite element software ANSYS/LS-DYNA,the dynamic mechanical properties of two-gradation concrete with random polygonal coarse aggregate were simulated.The effect of volume content,diameter of polygonal coarse aggregate and specimen size on the dynamic mechanical behavior of two-gradation concrete was analyzed.Simulated results showed that two-gradation concrete was rate-dependent and had size-effect.With the growth in the maximum diameter of polygonal coarse aggregate,the bearing capacity of two-gradation concrete declines.The bearing capacity of two-gradation concrete increased first,and then decreased with the middle diameter and volume content of polygonal coarse aggregate.With the increase of the minimumdiameter,the bearing capacity of two-gradation concrete declined.
作者
周姝航
刘海峰
ZHOU Shuhang;LIU Haifeng(College of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China)
出处
《混凝土》
CAS
北大核心
2019年第4期41-44,48,共5页
Concrete
基金
宁夏自然科学基金(2018AAC03030)
国家自然科学基金项目(51368048
11162015)
教育部"长江学者和创新团队发展计划"创新团队项目(IRT1067)
关键词
混凝土
凸多边形粗骨料
动态特性
数值模拟
concrete
convex polygonal coarse aggregate
dynamic mechanical properties
numerical simulation
