沥青路面受力时间历程分析

Time history responses of asphalt pavement stress

采用三维有限元分析的方法,在沥青路面模型上施加非均布的移动荷载模拟轮胎作用,从时间历程的角度对比分析了匀速与减速情况下沥青路面力学响应的差异。结果表明,移动荷载作用下,路面的应力呈现波动曲线,应力大小和方向都会随着时间的变化而变化;应力作用方向变化频繁,且减速的存在使得路面应力大大增加,这些都导致了城市路面破坏的加剧。

With the method of three dimensional finite element analysis, moving load was applied on the model of asphalt pavement to simulate the tire load. Different mechanical responses of asphalt pavement were showed on uniform motion and decel eration from the angle of time history. The results show that the mechanical responses of asphalt pavement are fluctuant under the moving load, and the value and direction changes with the time. The frequent changes of stress direction and the deceleration which greatly, increase the pavement stress, all these lead to the damage of urban road.