耦合路面损伤的车辆随机动荷载特性研究

为准确分析车辆对不平整路面作用的实际动荷载,在传统计算方法的基础上,进一步考虑了永久变形和平整度劣化等路面损伤累积的影响,提出了耦合损伤的车辆随机动荷载分析方法.通过计算轴载作用下路面各点的永久变形,推导路面不平整度的更新方程,将其引入车-路系统动力方程,采用Matlab编制求解程序,即可得到任意时间路面各点受到的车辆随机动荷载序列.基于该方法分析了车辆随机动荷载沿轮迹的分布变化,研究了随机动荷载系数随轴次的演化规律.结果 表明,车辆随机动荷载是随时间逐渐增大的动态演化过程,其沿轮迹的分布具有空间可重复性,随着轴载作用,动荷载的离散程度增大,将引起路面各点的损伤累积差异增大;而车辆行驶速度越低,新建路面越不平整,动荷载随时间演化速率越快,对路面造成的损伤越大.

Study on the characteristics of vehicle random dynamic load coupled with pavement damage

In order to accurately calculate the vehicle dynamic load on uneven pavement, a new vehicle load analysis method was proposed based on a traditional method by further considering the pavement damage.New pavement roughness could be identified by calculating the permanent pavement deformation at various points.Taking it to the vehicle-road system vibration differential equation, the vehicle dynamic load sequence can be obtained under different axle load times by Matlab programming.Then the random dynamic load distribution law and its change with axis load number were studied by the analysis method.The result shows that the distribution of the vehicle load along the wheel track has spatial repeatability.With the action of axle load, the dispersion degree of the dynamic load increases, which will cause the damage accumulation difference at each point on the pavement.The dynamic load coefficient increases nonlinearly with the action of axial load, and the lower the vehicle speed, the faster the dynamic load coefficient develops.This will damage the pavement structure.