公路弯道处桥头跳车的路面力学计算分析(英文)

为了分析汽车行驶在公路弯道桥头过渡段处时发生的桥头跳车现象对路面受力的影响,建立了四轮双轴载重车辆动力运动模型. 忽略汽车行驶过程中的一切阻尼及减振作用的影响,得出公路桥头跳车处的车辆动力运动方程. 根据车轮在桥头位置阶段的变化,充分考虑其边界受力条件,按位置阶段变化总结得出车辆动力运动方程的解析解. 结合工程实例计算,分析和研究得出汽车在高等级公路弯道路桥过渡段处经历桥头跳车过程中后轮对路面产生的荷载压力方程,此方程可推广应用到复杂应力对路面的影响. 结果显示桥头搭板处容易出现应力过大、集中现象,需要进行补强设计.

Mechanics analysis of vehicle bumping at approach slabs with superelevation

In order to analyze the pavement stress caused by vehicle bumping at an approach slab,a simplified four-wheeled biaxle vehicle-moving model is proposed.The effect of damping and vibration reduction in the process of vehicle-moving is not considered.Based on the position change of vehicle wheels at the approach slab,the vehicle dynamic vibration equations are summarized.Meanwhile,the undetermined coefficients of the vibration equations are obtained using the boundary and initial conditions of the vehicle.The analytical motion solutions of rear and front wheels at different stages are concluded.Consequently,a four-wheeled vehicle model is developed and vibration equations are provided,which can be used to analyze the impact of complicated stress on pavement.The results show that the excessive stress and stress concentration will occur at the approach slab,and it needs to be strengthened.