应用线弹性疲劳损伤理论的沥青路面轴载换算

应用疲劳损伤力学基本原理,探讨了适用于沥青路面轴载换算的新方法,并对该方法拟合的公式与规范按弯沉等效推荐的当量轴载换算公式进行了比较。计算结果表明在进行沥青路面轴载换算时,采用不同的等效换算原理,将导致非标准轴载与标准轴载当量换算系数上的不同,前者较后者大。这种差异一方面直接影响沥青路面的结构厚度设计,对设计年限内累计当量标准轴载作用次数的低估,必然导致沥青路面早期破损现象的发生;另一方面揭示弯沉等效表征的是路面结构的瞬间刚度性质,代替不了路面结构的长期疲劳强度特性。

Conversion Method of Axle Loading Acting on Asphalt Pavement Based on Theory of Linear Elastic Fatigue Damage Mechanics

According to the basic theories of damage mechanics, the conversion method of equivalent standard axle of nonstandard axle was induced, and its reliability was compared with that of the recommented method in terms of specification function of asphalt concrete pavement.The results demonstrated that different methods will result in the difference of equivalent coefficient which will affect the pavement thickness design.Lower estimation of the number of equivalent standard axle loads in the design life period.The deflection is stiffness index, which depicts vertical deformation of asphalt pavement under the traffic loadings and can not replace long term performance of fatigue strength of asphalt pavement.