沥青混合料疲劳损伤的非线性分析

Non-linear Analysis of Fatigue Damage of Asphalt Mixture

为了研究沥青混凝土疲劳过程中的非线性特性,对沥青混合料小梁试件进行疲劳试验,试验时考虑温度、应力比与加载间歇时间等因素.根据试验结果,对损伤因子与临界损伤因子进行了分析,通过ExpAssoc函数拟合得到了以各试验条件为参数的损伤因子本构方程.研究发现沥青混合料临界损伤因子与疲劳寿命之间存在单对数的线性关系;通过回归分析得到了二者之间的函数关系式.

For the purpose of studying the damage characteristics of fatigue process of asphalt mixture, the beam specimen of asphalt mixture was employed to conduct fatigue test. Temperature, stress, loading intermittence were taken into consideration in the test. According to the test data, the damage factor and critical damage factor were analyzed, constitutive equation has been obtained through ExpAssoc function fitting in which experimental conditions were taken for the parameters. The log-linear relationship was es tablished to relate the critical damage factor and the fatigue life of the asphalt mixture through a regression analysis .