沥青混合料疲劳失效判据探讨及验证

苑苗苗 张肖宁 陈伟强 张顺先

doi:10.3969/j.issn.1000-565X.2013.04.016

华南理工大学学报(自然科学版) >

2013 , Vol. 41 >Issue 4: 96 - 101

DOI: https://doi.org/10.3969/j.issn.1000-565X.2013.04.016

交通与运输工程

沥青混合料疲劳失效判据探讨及验证

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华南理工大学土木与交通学院，广东广州 510640

苑苗苗(1982-)，女，博士生，主要从事道路工程研究．

收稿日期: 2012-09-14

修回日期: 2013-03-01

网络出版日期: 2013-03-01

基金资助

国家自然科学基金资助项目( 51038004)

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Investigation and Verification of Fatigue Failure Criterion of Asphalt Mixtures

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School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,Guangdong,China

苑苗苗(1982-)，女，博士生，主要从事道路工程研究．

Received date: 2012-09-14

Revised date: 2013-03-01

Online published: 2013-03-01

Supported by

国家自然科学基金资助项目( 51038004)

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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．

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

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苑苗苗张肖宁陈伟强张顺先 . 沥青混合料疲劳失效判据探讨及验证[J]. 华南理工大学学报(自然科学版), 2013 , 41(4) : 96 -101 . DOI: 10.3969/j.issn.1000-565X.2013.04.016

Abstract

Presently,it is not reached consensus for asphalt mittures fatigue failure criterion. In this paper,based onthe dissipated energy method,the relative change rate of dissipated energy is put forward to characterize the damageaccumulation in the fatigue test process of asphalt mixtures,and the catastrophe point of the relative change ratebased on variable step is taken as the fatigue failure criterion of asphalt mixtures,with a theoretical proof being alsopresented.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.

Key words： asphalt mixture; fatigue failure criterion; dissipated energy; relative change rate; four-point bending fatigue test

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