动载作用下半刚性沥青路面瞬态响应分析

Transient Response Analysis of Semi-rigid Asphalt Pavement Subjected to Moving Load

为了研究车辆行驶作用下半刚性基层沥青路面的力学响应规律,采用大型有限元分析软件ANSYS12.0,基于实测荷载图式建立了非均布竖向移动荷载下层间有限粘结的弹性体系模型,探讨了动载作用下半刚性沥青路面竖向位移、各向应力和应变的瞬态动力响应规律。结果表明:通过实测轮胎接地面积计算得到折减系数为0.82,进而得到更为精确的荷载响应结果;荷载移动过程中,半刚性沥青路面的水平拉应力和拉应变的最大值并非出现在基层层底,路面各层计算点会出现交替受压或受拉现象;进行路面结构分析时,应通过控制行车方向的应力和应变满足水平方向的力学响应要求。

In order to study the dynamic response law of semi-rigid asphalt pavement under moving load, the limited interlayer bonding elastic system model under non-uniform vertical moving load distribution was established based on measured loading pattern with the finite element software ANSYS12. 0. The transient dynamic response rules of vertical displacement, stress and strain of semi-rigid asphalt pavement subjected to moving load was disscussed. The results show that the reduction factor is 0. 82 through calculating the measured tire＇s contact printer＇s area, furthermore, the more precise results of loading response were obtained. During the load moving, the maximum values of horizontal tensile stress and strain of semi-rigid asphalt pavement do not occur at the base layer bottom. Compression or tension states were alter-nated at calculation points of each pavement layer. The stress and strain in driving direction should be controlled to meet the mechanical response requirements in horizontal direction.