大样本条件下沥青混合料疲劳试验参数的概率分布分析

Probability distribution analysis of fatigue test results for asphalt mixture with a large sample

采用一个沥青混合料小梁试件大样本,在相同条件下进行了应变控制疲劳试验,并对疲劳试验结果进行了正态分析和Weibull分析,得到了沥青混合料试件疲劳寿命、初始模量和累计耗散能的概率分布规律.研究分析表明:沥青混合料的疲劳寿命、累计耗散能和初始模量呈3参数Weibull分布和对数3参数Weibull分布,可以采用3参数Weibull分布来分析沥青混合料的疲劳特性.

Experimental research on strain-controlled fatigue properties of asphalt mixture with a large sample is carried out. The probability distributions of logarithmic fatigue life, cumulative dissipated energy and initial stiffness are analyzed according to Normal and Weibull respectively. The probability distribution rules of fatigue life, cumulative dissipated energy and initial stiffness are elicited. It is shown that fatigue life and cumulative dissipated energy and stiffness all follow three-parameter Weibull distribution, and three-parameter Weibull may be used to analyze the fatigue test data of asphalt mixture.