移动荷载下路面结构应力响应分析

Dynamic Response Analysis of Pavement Structure under Moving Load

实际中汽车总是以一定的速度行驶在路面上,首先将汽车荷载简化为移动的均布荷载,借助大型有限元软件ABAQUS,利用三维动力有限元方法,分析了移动荷载下车辆正常行驶状态、慢速行驶及刹车情况时路面结构内部应力响应规律。分析结果表明,较低的速度将会使路面结构内部产生更大的应力,各应力分量与速度变化基本呈线性关系;刹车过程中在路表面产生的水平荷载对路表面层附近的水平剪应力影响相当大,在刹车较频繁区域,提高面层及其层间接触面的抗剪强度,可减少或防止推挤、拥包等病害的出现。分析结果可为路面结构设计和路面施工提供理论参考。

Based on the assumption that vehicles usually run on the road at one speed, vehicles loads have been simplified to a moving uniform load. The response of the stress in the pavement structure is got by the three dimensional dynamic FEM of software ABAQUS. The simulation analysis results under the contain speed are compared with those under relatively low pace and under the state of braking. The conclusion can be drawn that the stresses in the pavement structure decrease with the increasing of the pace and stress components change linearly with moving speed; the horizontal loads caused by the braking process have a remarkable effect on the horizontal sheafing stresses of superficial pavement layer. Increasing the ability of shear strength can resist the distress of upheaval and wave etc. The results can give theoretic reference to the design and construction of the pavement.