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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 mechanical response of semi-rigid asphalt pavement under vehicle driving, a large-scale finite element analysis software ANSYS12.0 was used to establish a finite element model of elastic bond between layers under non-uniform vertical moving load based on the measured load diagram The dynamic response of vertical displacements, stresses and strains in semi-rigid asphalt pavement subjected to dynamic loading is discussed. The results show that the reduction coefficient calculated by measured tire ground area is 0.82, and the more accurate load response results are obtained. The maximum horizontal tensile stress and tensile strain of semi-rigid asphalt pavement are not observed in the grass-roots level At the end of the pavement, alternating pressure or tension will occur alternately at various points of the pavement. When analyzing the pavement structure, the stress response and strain in the driving direction should satisfy the mechanical response requirements in the horizontal direction.