沥青路面疲劳当量温度计算方法研究

我国现行沥青路面设计规范以15℃作为测定沥青混合料疲劳性能的试验温度,忽略了地区之间存在明显的温度差异。根据路面弹性力学层状理论,对控制应力与应变两种疲劳加载模式进行分析,讨论了适用于路面实际疲劳状况的加载模式。分析了影响沥青路面疲劳寿命的因素,并采用SHELL方法,根据Miner法则计算疲劳当量温度,提出了日疲劳当量温度的计算公式,计算了我国8地区的年疲劳当量温度,讨论了不同地区疲劳当量温度的取值范围和取值方法。此研究结果为提高路面结构分析精度提供了可靠的温度参数依据。

Research on Fatigue Equivalent Temperature Calculation Method of Asphalt Pavement

Current norms taking 15℃as the test temperature of asphalt mixture fatigue properties is clearly improper,for it neglects the obvious temperature differences between various areas.By comparing two loading patterns of controlling the stress and strain,the loading pattern applied to the actual road fatigue conditions is discussed,in which the impact factors of fatigue life of asphalt pavement are analyzed.Adopting SHELL methods based on the Miner's rule,the fatigue equivalent was computed,with which the formula of Day Fatigue Equivalent Temperature was deduced,the Annual Fatigue Equivalent Temperature for eight regions was calculated and fatigue equivalent temperature ranges of the different areas were discussed. The results provide a reliable basis for the temperature parameters to improve the pavement structure analysis.