摘要
考虑裂缝黏聚力的作用,基于Paris位移公式推导出混凝土三点弯曲梁裂缝扩展过程中断裂过程区上的裂缝张开位移的解析表达式。采用起裂韧度作为裂缝起裂及扩展的判断标准,提出了荷载作用下混凝土裂缝起裂、扩展及失稳破坏全过程的数值模拟方法,并分别与国内外断裂试验实测值及有限元计算值进行了比较。结果表明,本文提出的数值模拟方法形式简单且精度较好。
Based on Paris＇ displacement formula and by considering the role of cohesive stress in the frac- ture of concrete,a theoretical expression for crack opening displacement of three-point bending notched beams is derived. Then, with the initial fracture toughness taken as the criterion of crack initiation, the derived expression is applied in simulating the whole cracking processes of concrete,including the beginning and development of cracking as well as the subsequent failure of concrete. To test the validity and performance of the model proposed in this paper, its calculating result is compared with experimental data and that of the finite element model and a high agreement exits among them,which indicates that the proposed method is not only simple in form and application but also with high precision.
出处
《计算力学学报》
CAS
CSCD
北大核心
2013年第1期143-148,155,共7页
Chinese Journal of Computational Mechanics
基金
国家自然科学基金青年基金(51209094
51009020)
海岸和近海工程国家重点实验室研究基金(LP1210)
中国博士后科学基金(2011M500334)资助项目
关键词
混凝土
裂缝扩展
应力强度因子
裂缝张开位移
起裂韧度
concrete
crack propagation
stress intensity factor
crack opening displacement
initial fracture toughness
