路面结构裂缝应力强度因子数值计算  

Numerical Computation of Crack Stress Intensity Factors in Pavement Structure

作　　者：乐金朝[1] 丁武洋[1] 谢丽[1] 

机构地区：[1]郑州大学环境与水利学院,河南郑州450002

出　　处：《郑州大学学报（工学版）》2002年第2期41-43,50,共4页Journal of Zhengzhou University（Engineering Science）

基　　金：河南省 2 0 0 2年度杰出青年科学基金资助项目

摘　　要：路面裂缝尖端应力强度因子是判断裂缝开裂扩展的重要指标 .应用奇异等参元及断裂力学理论 ,对 3种荷载简化模式下路面单裂缝问题进行了数值分析 .在裂缝尖端附近采用最小二乘法回归得到了相应的裂缝尖端应力强度因子 ,同时应用有限宽板条模型进行了数值验算 .计算结果表明 ,裂缝长度与基层模量对裂缝尖端应力强度因子影响较大 ,凸形荷载作用下裂缝更易扩展 .Stress intensity factor is an important criterion which can determine the developing of road crack. Based on the singular isoparametric element and fracture mechanics, this paper analyzes and discusses the problem about the singular crack in pavement structure under three types of load. At the crack tips, we get the corresponding stress intensity factors by means of regression analysis. Then this paper presents the finite strip model to verify the program. The results indicate that length of crack and the modulus of base course have a remarkable influence. Under the convex load, the crack develops more easily.

关 键 词：路面结构 裂缝 数值计算 奇异等参元 断裂力学 应力强度因子 

分 类 号：U416.201[交通运输工程—道路与铁道工程]