浇注式沥青混凝土疲劳寿命的能量法

根据应变控制模式下的4点弯曲疲劳试验方法，用能量法研究了浇注式沥青混合料抗疲劳性能。通过多个应变水平下的疲劳试验，得出浇注式沥青混凝土的疲劳寿命与累积耗散能在双对数坐标下的线性关系。并回归出了浇注式沥青混合料在不同应变水平下疲劳寿命预测方程。用Maxwell模型分析了浇注式沥青混合料疲劳破坏与能量耗散的关系，并将滞后回线和滞后角引入到浇注式沥青混合料疲劳性能研究中，得出滞后角大的混合料有更好的抗疲劳性能。

Fatigue Life Analysis of Gussasphalt Concrete Based on Energy Method

The fatigue resistance of Gussasphalt mixture was analyzed with energy method after four-point flexural fatigue test under multiple strain levels. Through the fatigue test under multiple strain levels, the linear relationship was obtained between fatigue life and cumulative dissipated energy in log-log plot. And the equation for fatigue life prediction under different strain levels was also regressed. Besides, the relation between fatigue damage and dissipated energy of Gussasphalt mixture was analyzed with Maxwell model. And with the conceptions of hysteresis loop and phase angle, it is found that the mixture with bigger phase angle has better fatigue resistance.