基于车辆-道路结构耦合振动的不平整路面动力响应分析  

Dynamic response analysis of rough pavement under vehicle-road system coupled vibration

作　　者：卢正[1] 姚海林[1] 胡智[1] 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071

出　　处：《岩土工程学报》2013年第S1期232-238,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51209201;51279198);武汉市青年科技晨光计划项目(201150431070);西部交通建设科技项目(2011318493720;20113184931700)

摘　　要：为了更准确地研究行车荷载作用下道路结构的动力响应,从车辆的组成特点和路面不平整特性出发,将车辆、路面、路基结构作为一个整体系统来建模,提出了车辆-不平整路面-路基结构耦合动力学分析模型,同时考虑轮胎与路面接触处的路面不平整位移、路面本身位移和轮胎与路面相对位移的影响,采用Fourier变换方法推导出了由于路面不平整引起的车辆附加动荷载和路面动力响应的解析表达式,并利用快速傅立叶变换(FFT)方法得到了数值计算结果。分析了行车速度、路面不平整波长、不平整幅值以及路面厚度和模量对路面动力响应的影响。结果发现:车辆-道路耦合振动引起的路面动力响应会出现两个峰值,两个峰值是由于车辆振动频率达到车体系统的两个固有频率共振而产生。因此,工程中应合理控制路面平整度和行车速度,避免共振的发生。In order to investigate the dynamic responses of rough pavement subjected to traffic loads more accurately,the composition characteristics of vehicle and the geometric roughness of pavement are highlighted.By regarding the vehicle,pavement and subgrade as a whole system,a vehicle-rough pavement-subgrade coupling model is proposed.A dynamic equilibrium equation for the coupling system is deduced by considering the roughness,pavement deformation and compatible deformation.The analytical solutions of additional dynamic load and vertical displacement of the pavement are derived using the Fourier transform method.By employing the fast Fourier transform(FFT),the numerical results are obtained and used to analyze the influence of moving load velocity,wavelength,amplitude,thickness and modulus of pavement on the dynamic displacement responses.The computed results show that two peaks of the vertical response can be observed with increase of the rough pavement wavelength and the load velocity because of resonance of the coupling system.Therefore,it is important to control the pavement roughness and vehicle speed to avoid resonance in engineering practice.

关 键 词：车辆 道路结构 不平整路面 耦合振动 FOURIER变换 共振 

分 类 号：U416.2[交通运输工程—道路与铁道工程]