沥青混合料疲劳失效判据探讨及验证  

Investigation and Verification of Fatigue Failure Criterion of Asphalt Mixtures

作　　者：苑苗苗[1] 张肖宁[1] 陈伟强[1] 张顺先[1] 

机构地区：[1]华南理工大学土木与交通学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2013年第4期96-101,共6页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51038004)

摘　　要：鉴于目前对于沥青混合料的疲劳失效判据国内外未达成共识.在耗散能方法的基础上,采用耗散能相对变化率表征沥青混合料疲劳试验过程中的损伤演化程度,结合四点弯曲疲劳试验,提出采用基于可变步长的耗散能相对变化率的突变点作为疲劳失效判据,并给出了理论解释.最后在此失效判据下,验证了文中方法的可行性,并证明了所提出的疲劳性能预测模型独立于荷载控制模式.Presently, it is not reached consensus for asphalt mittures fatigue failure criterion. In this paper, based on the dissipated energy method, the relative change rate of dissipated energy is put forward to characterize the damage accumulation in the fatigue test process of asphalt mixtures, and the catastrophe point of the relative change rate based on variable step is taken as the fatigue failure criterion of asphalt mixtures, with a theoretical proof being also presented. Then, with the help of this criterion, the feasibility of the proposed prediction model of fatigue performance, which is independent of the load control mode, is verified.

关 键 词：沥青混合料 疲劳失效判据 耗散能 相对变化率 四点弯曲疲劳试验 

分 类 号：U414[交通运输工程—道路与铁道工程]