沥青混合料黏弹性数值转换与路面结构力学响应计算

为对比分析沥青混合料的弹性和黏弹性路面结构模型的不同力学响应特性，分别建立弹性和黏弹性两种三维有限元模型，计算结果表明:黏弹性模型中沥青层底拉应变随车速的增加而减小，在较低车速范围内沥青层底拉应变随车速的增加减小速率大，当车速超过80 km/h时，沥青层底横向拉应变减小速率迅速变小。弹性模型中沥青层底拉应变随车速变化规律不明显，不能反映车速对沥青层内力的影响。

Numerical Conversion of Viscoelasticity of Asphalt Mixture and Mechanical Response Calculation of Pavement Structure

In order to compare and analyze the mechanical response characteristics of elastic and viscoelastic asphat mixture pavement structure models, two 3D finite element models were established respectively. The result of calculation shows that, for the viscoelasticity model, the tensile strain at the bottom of asphalt layer decreases with the increase of vehicle speed in such manner that in the scope of low speed, the tensile strain decreases at a high rate, when the speed exceeds 80 km/h, the lateral tensile strain decreases at a rapidly reduced rate; for the elasticity model, the tensile strain at the bottom of asphalt layer changes with vehicle speed in an unobvious way, which can not reflect the influence of vehicle speed on the internal force of asphalt layer.