中文摘要：

为了研究沥青混合料在重复荷载作用下的疲劳特性并描述疲劳-蠕变损伤效应共同作用的过程,考虑沥青混合料具有的动态性质,从粘弹性损伤力学基本理论出发,基于应变等效假设,采用复数模量定义了损伤变量。通过分析沥青混合料在周期荷载作用下的损伤变化规律,运用疲劳-蠕变耦合损伤理论,建立了疲劳-蠕变损伤效应共同作用时的损伤演化方程,提出了体现温度及应力影响的损伤模型和疲劳寿命预测模型,并对损伤模型进行了分析。研究结果表明：构建的损伤模型满足热力学准则和物理条件;沥青混合料疲劳失效是由疲劳-蠕变损伤效应共同影响所致;利用提出的疲劳模型可以更好地预测不同温度和应力条件下的沥青混合料疲劳寿命。

英文摘要：

In order to study fatigue performance of asphalt mixture under cyclic loading and describe combined action process of fatigue-creep damage effect,considering the dynamic character of asphalt mixture and using the elementary theory of viscoelastic damage mechanics,complex modulus was used to define damage variable based on strain equivalence hypothesis.By analyzing the damage evolution rules of asphalt mixture under cyclic loading and using fatigue-creep coupling damage theory,the damage evolution equations of asphalt mixture under fatigue-creep damage effect were built.The damage evolution and fatigue life prediction model of considering the effects of stress and temperature was derived.Results show that the proposed damage model of satisfying thermodynamic laws and physical requirement is proved.Fatigue failure of asphalt mixture is caused by fatigue-creep damage effect.The proposed fatigue model can be better used to predict the fatigue life of asphalt mixture under different temperatures and stresses.