摘要
根据混凝土的细观组成和结构特点,对传统二维建模方法加以继承与改进,提出了一种高效的分步入侵判定算法.将孔隙直观地反映在模型中,建立了不同的含孔隙混凝土细观模型.对含圆形、椭圆形、多边形骨料与圆形、椭圆形孔隙的混凝土标准试件分别进行了建模研究,结果表明本文的算法具有较强适用性.同时,通过对不同面积率与多种形状骨料/孔隙混凝土的大量建模进一步验证了该算法的效率.模拟了混凝土试件在单轴压缩下的准静态力学性能,分析了混凝土内部孔隙对其裂纹扩展的主要路径、破坏模式以及宏观力学性能的显著影响.
According to the meso⁃structure of concrete,a high⁃efficiency stepwise overlap checking method was proposed based on traditional 2D modeling.Voids were introduced direct⁃ly into the models and different concrete meso⁃structures were generated.The method involves various models containing circular,elliptical or polygonal aggregates and circular or elliptical voids.Meanwhile,several modeling examples based on different area fractions and different shapes of aggregates and voids were given to prove the computation efficiency of the proposed algorithm.At last,the mechanical behaviors of standard concrete specimens under uniaxial compression were simulated.The effects of internal voids on the main paths of crack propaga⁃tion,concrete failure modes and macroscopic mechanical performances were analyzed.
作者
陈青青
张煜航
张杰
王志勇
王志华
CHEN Qingqing;ZHANG Yuhang;ZHANG Jie;WANG Zhiyong;WANG Zhihua(Institute of Applied Mechanics,College of Mechanical and Vehicle Engineering,Shanxi Key Laboratory of Material Strength&Structural Impact,Taiyuan University of Technology,Taiyuan 030024,P.R.China)
出处
《应用数学和力学》
CSCD
北大核心
2020年第2期182-194,共13页
Applied Mathematics and Mechanics
基金
国家自然科学基金(11702186
11390361
11390362)~~
关键词
混凝土
细观结构
孔隙
入侵判定
裂纹扩展
concrete
meso⁃structure
void
overlap checking
crack propagation
