考虑材料特性随温度变化时沥青路面的温度应力

把沥青路面视为层状弹性体系,并将材料特性作为随温度变化的参数,推导了沥青路面温度应力问题的理论解.首先,利用热弹性理论来描述层状弹性体系的温度应力问题,同时考虑了材料特性的随温度变化.其次,通过对热弹性力学的平衡方程进行Laplace和Hankel积分变换得到了单一层问题的解,再利用传递矩阵法得到了多层弹性体系温度应力问题的理论解.最后,将该理论解用于沥青路面温度应力问题的计算,并与材料特性取常数的情况进行了对比.结果表明随温度变化的材料特性对沥青路面的温度应力有显著的影响.

Thermal Stresses of Asphalt Pavement with Material Property Dependent on Temperature

Regarded asphalt pavement as a multilayer elastic system and material property as the parameter changing with temperature respectively, the analytical solutions for thermal stresses of asphalt pavement were derived.First, thermo-elastic theory was used to describe thermal stresses of multi-layered elastic system, while the temperature-dependent material property was considered.Then, the solution for single layer was obtained by using Laplace transformation and Hankel transformation respectively by using thermo-elastic equations of equilibrium.In addition, the transfer matrix method was applied to derive the theoretical solution of thermal stress for multilayer elastic system.Finally, the theoretical solution was applied to calculate thermal stresses in asphalt pavement, and the thermal stress was compared with the case that the material property is supposed to be constant.The result shows the remarkable impact of temperature-dependent material property on thermal stresses of asphalt pavement.