摘要
为研究混凝土在冲击荷载作用下的细观破坏机制,将混凝土视为由骨料、水泥砂浆及二者间的黏结带所构成的三相复合材料,根据瓦拉文公式确定代表骨料的颗粒数,采用蒙特卡罗方法生成随机骨料模型.采用双折线损伤模型描述混凝土细观单元的损伤退化.利用非线性有限元方法对湿筛混凝土立方体小试件和全级配混凝土立方体大试件在冲击荷载作用下的细观破坏机制进行数值模拟,给出了试件的应力-应变曲线和动态抗压强度.研究结果表明,数值模拟所得的结果与实验结果表现出较好的一致性.
In order to study microscopic failure mechanism of concrete under impact loading,the concrete is considered as a three-phase composite composed of matrix,aggregate and interface between them.The number of aggregates is calculated by using Walraven J.C formula and meso-scale structure is represented with random aggregate model by using Monte-Carlo method.The bilinear damage evolution model is adopted to describe the meso-element s damage devolution.The microscopic failure mechanism of concrete under impact l...
出处
《北京工业大学学报》
EI
CAS
CSCD
北大核心
2009年第2期213-217,共5页
Journal of Beijing University of Technology
基金
国家自然科学基金资助项目(50325826
90510011)
北京市教育委员会科学技术与研究生建设项目资助(4700001401509)
北京市属市管高校人才强教计划资助项目(05004012200515).
关键词
混凝土
冲击荷载
细观损伤
数值模拟
concrete
impact loading
microscopic damage
numerical simulation
