交通荷载作用下公路路面结构振动分析

Traffic-Load-Induced Vibration of Highway Pavement Structure

为了研究路面结构的振动特性,基于2.5D有限单元方法建立了高速公路路面结构和下卧层地基在交通荷载作用下的三维耦合振动模型。通过计算分析了路面振动加速度的变化规律和路面结构的面层、基层和底基层中的应力分布,考虑了车辆运行速度、荷载振动频率、路面分层结构形式、路面材料和下卧层地基模量等因素的影响。结果表明:车辆运行速度和荷载振动频率对路面结构的振动响应有着显著影响;同时随着路面材料刚度的提高,路面结构振动会降低,在实际工程中可通过选用合适刚度的路面材料以获得路面性能的较大改善。

In order to analyze vibration features of highway pavement structure induced by vehicle traffic loading,a coupling model for laminated pavement structure and underlying ground dynamic interaction subject to distributed moving loading was developed by employing a hybrid method of the 2.5 dimensional finite elements and thin layer elements.The rules of vibrated acceleration of pavement surface and the stress distribution features of pavement surface,base and subgrade were heavily investigated when vehicle load passed through,in which the vehicle speed,load vibration frequency,structure form and material of pavement and modulus of underlying ground were considered.The results shows the vehicle speed and its vibration frequency are of great influnence to the acceleration response of pavement structure,meanwhile the stiffer the pavement material is,the lower the pavement structure is,which means the performance of pavement can be improved by choosing the proper material.