低应变状态下橡胶混凝土细观裂缝数值分析  

Numerical Analysis of Micro-cracks in Rubber Concrete under Low Strain Conditions

作　　者：李厚民 吴克洋 柯俊宏 汪洋 LI Hou-min;WU Ke-yang;KE Jun-hong;WANG Yang(School of Civil Engineering, Architecture and Environment, Hubei University of Technology,Wuhan 430068, China)

机构地区：[1]湖北工业大学土木建筑与环境学院,武汉430068

出　　处：《长江科学院院报》2022年第4期149-155,共7页Journal of Changjiang River Scientific Research Institute

摘　　要：为了研究橡胶混凝土内部微裂缝的开展形态和影响裂缝开展的原因,基于APDL语言对ANSYS进行二次开发,建立了由砂浆、骨料、橡胶、橡胶-砂浆界面、骨料-砂浆界面五相组成的随机骨料模型,进行了橡胶混凝土压缩模拟,并在此基础上使用灰度识别对各级配骨料及橡胶分布与裂缝分布的关系进行了研究。结果表明裂缝在橡胶分布密集区域快速开展,低橡胶掺量时裂缝像素个数与橡胶分布密集度成正比;高橡胶掺量时裂缝像元个数随橡胶分布密集度的提高先减少后提高。To explore the propagation form of micro-cracks in rubber concrete and the factors affecting crack propagation,a random aggregate model composed of five phases(mortar,aggregate,rubber,rubber-mortar interface,and aggregate-mortar interface)was established by ANSYS redevelopment in APDL language.The model was applied to simulating the compression of rubber concrete,and on such basis,the relations of aggregate gradation with rubber and cracks distribution were examined by using grayscale recognition.Results illustrated that cracks developed rapidly in areas with dense rubber distribution.The number of crack pixels was proportional to the density of rubber distribution in the presence of low rubber content;when rubber content was high,the number of crack pixels first decreased and then increased with the densification of rubber distribution.

关 键 词：橡胶混凝土 细观裂缝 灰度识别 有限元分析 ANSYS二次开发 

分 类 号：TU528[建筑科学—建筑技术科学]