论文部分内容阅读
为更准确地模拟沥青混凝土路面实际的受力状态,基于弹性层状理论,借助大型有限元分析软件ANSYS建立了沥青混凝土路面三维有限元黏弹性模型,并对其施加非均布垂直荷载和切向摩擦行为的共同影响,分析车辆在匀速行驶时,沥青混凝土路面在不同载重车辆荷载作用下的动力响应。结果表明,最大纵向拉应力位于底基层中部,最大纵向压应力位于沥青混凝土面层。存在一中性层,其上结构主要承受压应力,其下结构主要承受拉应力。中性层位于基层中部附近。最大拉应力为0.031MPa,远小于容许拉应力0.081MPa,故路面结构破坏不是脆性破坏引起的,而是与疲劳破坏有很大关系。超载并不是造成路面损坏的唯一因素。
In order to more accurately simulate the actual state of asphalt concrete pavement, based on the elastic layered theory, a three-dimensional finite element viscoelastic model of asphalt concrete pavement was established with the aid of large-scale finite element analysis software ANSYS, and applied with non-uniform vertical load and cutting To the common influence of friction behavior, the dynamic response of asphalt concrete pavement under different load of vehicles is analyzed when the vehicle is running at a constant speed. The results show that the maximum longitudinal tensile stress is in the middle of the subbase and the maximum longitudinal compressive stress is in the asphalt concrete surface layer. There is a neutral layer, on which the structure is mainly subjected to compressive stress, and the underlying structure is mainly subjected to tensile stress. The neutral layer is located near the middle of the grassroots. The maximum tensile stress of 0.031MPa, far less than the allowable tensile stress of 0.081MPa, so the failure of pavement structure is not caused by brittle failure, but with fatigue damage have a great relationship. Overloading is not the only factor causing damage to the pavement.