水泥混凝土路面等效疲劳温度应力系数

分析了日疲劳温度应力系数的影响因素,结果表明温度荷载和轴载的昼夜分布对其影响最大。提出利用多年累积的每日气象资料直接推导等效疲劳温度应力系数的方法,该方法不用计算月、年疲劳温度应力系数,其计算结果提高了疲劳温度应力计算的准确性。基于中国93个基本气象站50 a实测的日气象资料,计算得到等效疲劳温度应力系数,并给出了回归公式及各地的回归系数。

Equivalent Fatigue Thermal Stress Coefficient of Cement Concrete Pavement

Influence factors on daily fatigue thermal stress coefficient were analyzed.Analysis results show that day and night distributions of thermal load and axle mass have the maximal influence on daily fatigue thermal stress coefficient.The equivalent fatigue thermal stress coefficient method was deduced from daily meteorological data accumulated of many years,which omitted the calculation of monthly and yearly fatigue thermal stress coefficients and improved the calculation precision of fatigue thermal stress.Nearly fifty-year daily data of China from 93 basic meteorologic stations were used to calculated the equivalent nation-wide fatigue thermal stress coefficient;regression formulas and regression coefficient of different cities were given.