车路耦合荷载下沥青混凝土路面振动响应  

Vibration response of asphalt concrete pavement under vehicle-road coupled load

作　　者：董倩[1,2] 程少锋 张献民[1,3] 包伊婷 DONG Qian;CHENG Shaofeng;ZHANG Xianmin;BAO Yiting(College of Transportation Science and Engineering,Civil Aviation University of China,Tianjin 300300,China;School of Civil Engineering,Tianjin University,Tianjin 300072,China;College of Civil Aviation,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]中国民航大学交通科学与工程学院,天津300300 [2]天津大学建筑工程学院,天津300072 [3]南京航空航天大学民航学院,南京210016

出　　处：《北京航空航天大学学报》2023年第9期2385-2394,共10页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国家自然科学基金(51178456);中央高校基本科研业务费(3122017039)。

摘　　要：为研究沥青混凝土路面的振动特性,采用滤波白噪声法拟合出路面平整度时域模型,基于1/4车辆模型,考虑车辆–道路的耦合作用,分析不同车辆速度、不同路面平整度等级时,车辆对路面的实时动荷载;建立道路三维有限元模型,研究车辆随机动荷载作用下道路的振动响应,分析道路各结构层参数对道路表面中心振动基频的影响。结果表明:路面平整度等级、车辆行驶速度对车–路耦合系统影响显著,当路面平整度等级由A级变化至C级时,同一行驶速度下的车辆动荷载增大了20%;道路振动基频随土基动模量呈对数关系增加,土基动模量由60 MPa增大至260 MPa,道路振动基频由5.61 Hz增大至10.80 Hz,振动基频增幅高达48.06%;在常用动模量变化范围内,面层、基层、垫层的动模量对基频的影响较小;随着面层、基层与垫层厚度的增加,道路基频呈线性减小的趋势,面层厚度对振动频率影响的敏感性大于基层厚度,基层厚度对振动频率影响的敏感性大于垫层厚度;在常用结构层厚度变化范围内,振动基频分别减小9.28%、18.05%与12.75%。试验结果证明:振动基频计算较正确,计算结果可为道路承载力快速测试提供理论支持。To study the vibration characteristics of asphalt concrete pavement,the time domain model of road roughness was simulated by the white noise filtering method,the coupling effect of vehicle and road with different vehicle speeds and different road roughness levels was analyzed based on the quarter vehicle mode,and the real-time dynamic load of vehicle on the road surface was determined to study the vibration characteristics of Tarmac pavements.The three-dimensional finite element model of the road is established,the vibration response of the road under the action of the vehicle random dynamic load is analyzed,and the influence of the road structure-layer parameters on the fundamental vibrational frequency of the road surface center is analyzed.The results show that the pavement roughness level and vehicle speed have significant influence on the vehicle-road coupling system.When the pavement roughness level changes from class A to class C,the dynamic load of vehicles under the same speed increases by 20%;the fundamental vibrational frequency of the road increases with the logarithmic relation of dynamic subgrade modulus,the subgrade modulus increases from 60 MPa to 260 MPa,the fundamental vibrational frequency of the road increases from 5.61 Hz to 10.80 Hz,with an increase of 48.06%.The dynamic modulus of the surface layer,base layer and cushion have little influence on the fundamental frequency,which are almost negligible.As the thickness of surface layer,base layer and cushion increases,the fundamental frequency of road shows a linear decrease trend.Within the commonly used variation range of the thickness of structure layer,the fundamental vibrational frequency decreases by 9.28%,18.05%and 12.75%respectively.

关 键 词：沥青混凝土路面 车辆动荷载 有限元 结构层厚度 结构层弹性模量 振动基频 

分 类 号：U411[交通运输工程—道路与铁道工程]