浇注式沥青混凝土疲劳损伤分析  

Analysis on Fatigue Damage of Gussasphalt Concrete

作　　者：张华[1,2] 钱觉时 吴文军[2] 郝增恒 王民 

机构地区：[1]重庆大学材料科学与工程学院,重庆400045 [2]重庆市智翔铺道技术工程有限公司,重庆400060

出　　处：《建筑材料学报》2011年第6期771-775,共5页Journal of Building Materials

基　　金：西部交通建设科技项目(2002.318.000.30)

摘　　要：根据应力等效假设,以劲度模量作为浇注式沥青混凝土疲劳损伤参量,将浇注式沥青混凝土劲度模量损伤因子增量随加载次数的累积过程分为3个阶段,并将宏观力学性能发生剧烈变化的第3阶段定义为浇注式沥青混凝土疲劳裂缝出现区域.通过对不同温度下浇注式沥青混凝土疲劳损伤试验结果的分析,定义了浇注式沥青混凝土疲劳破坏时的损伤因子为临界损伤因子,分析得到了浇注式沥青混凝土疲劳破坏时损伤因子与疲劳寿命之间的幂函数关系,建立了考虑温度因素的疲劳损伤模型.According to the stress equivalence assumption,the damage increment of stiffness modulus of gussasphalt concrete(GA) with the accumulation of loading number is divided into 3 stages in case of using stiffness modulus as a fatigue damage parameter.The third stage,which is characterized by the distinct change of mechanical property,is defined as the stage of fatigue cracking.Based on the character of fatigue damage of GA at different temperature,the critical damage factor(D_p) for GA was defined.It is shown that there is a power function relationship between damage factor(D) and fatigue life of GA when failure. Furthermore,a fatigue damage model,considering the influence of temperature,is established by fitting the damage factor of GA with an appropriate function.

关 键 词：浇注式沥青混凝土 劲度模量 疲劳损伤 临界损伤因子 疲劳损伤模型 

分 类 号：TU528.42[建筑科学—建筑技术科学]