中文摘要：

为了更好地理解沥青结合料的疲劳失效特性,以黏弹连续介质损伤力学为分析手段,通过加速疲劳试验和传统时间扫描疲劳试验系统研究了基质沥青和改性沥青在不同加载条件下的疲劳失效行为.研究发现,基于虚应变能理论提出的将最大存储虚应变能指标作为沥青加速疲劳试验中的疲劳失效新定义,与现象学指标相位角峰值有着很好的等效性,并和时间扫描试验中的疲劳失效定义保持了一致,进而依据疲劳失效定义建立了虚应变能释放率和材料疲劳寿命之间的特性关系准则.该特性准则与试验方法和加载条件无关,可作为统一的疲劳失效准则运用于沥青结合料的疲劳性能预测.

英文摘要：

To better understand the fatigue failure characteristics of asphalt binder,the mechanic analysis approach of viscoelastic continuum damage（VECD） was adopted.And both accelerated fatigue test and traditional time sweep fatigue test were employed to study the fatigue failure behavior of both neat and modified asphalt binders under different loading conditions.Test results indicate that the maximum stored pseudo strain energy（PSE）,which is based on the PSE theory and proposed as the failure definition for accelerated fatigue test of asphalt binder,is equivalent to phenomenological parameter as phase angle peak and is also consistent with the fatigue failure defined in the time sweep tests.Based on the proposed failure definition,the characteristic relationship between PSE releasing rate and fatigue life was developed and found to be independent on testing methods and loading conditions.This characteristic relationship was proposed as the unified fatigue failure criterion for asphalt binder on fatigue performance prediction.