移动随机荷载下沥青路面的动力学特性和参数影响分析  

DYNAMICS OF ASPHALT PAVEMENT UNDER MOVING STOCHASTIC LOADS AND PARAMETER ANALYSIS

作　　者：李皓玉[1,2] 杨绍普[1] 齐月芹[1] 徐步青[1] 

机构地区：[1]石家庄铁道大学工程力学系,河北石家庄050043 [2]河北省交通安全与控制重点实验室,河北石家庄050043

出　　处：《工程力学》2011年第11期159-165,共7页Engineering Mechanics

基　　金：国家自然科学基金重点项目(10932006);河北省自然基金项目(E2011210055;E2010001095);河北省交通安全与控制重点实验室开放课题(JTKY2011001)

摘　　要：为研究车辆与路面的相互作用机理,采用四自由度二分之一悬架模型模拟车辆系统,以Kelvin地基上无限大双层Kirchhoff薄板模拟沥青路面,建立了车辆-路面-路基相互作用系统。通过Fourier积分变换得到路面动力响应的解析解,考虑路面随机不平度和车辆与路面的相互作用,研究了移动随机荷载作用下沥青路面动力响应的分布规律,进一步讨论了路面不平度、车辆载重、车辆悬架刚度、悬架阻尼、轮胎刚度和轮胎阻尼等参数对沥青路面动力响应的影响,形成了一套车辆对道路破坏性研究的系统化方法。结果表明:提高路面不平度等级、严禁车辆超载、限制轮胎超压、优化悬架刚度和悬架阻尼可有效降低路面的动力响应,延长路面的使用寿命,防止路面早期破坏。研究结果可为避免路面的早期破坏,延长路面的使用寿命提供理论参考。In order to study the interaction mechanism between vehicles and the pavement, a vehicle-pavementsubgrade interaction system is established by simplifying a moving vehicle as a 1/2 suspension model with four degrees of freedom and modeling the asphalt pavement as an infinite two-layer Kirchhoff plate on Kelvin foundation. By means of Fourier integral transform, the analytical solutions of dynamic responses of the pavement are derived by linking pavement surface roughness and a moving vehicle. The vibration characteristics of pavement under moving stochastic loads are analyzed by a numerical method. A parameter study then follows to show the effect of pavement surface roughness, loading capacity, suspension stiffness, suspension damping, tire stiffness, and tire damping on the dynamic responses of the pavement structure. A full systematic method to study the pavement damage due to vehicles is made. The results show that improving the pavement surface roughness level, prohibiting vehicle overload and tire overpressure, and optimizing suspension stiffness and suspension damping can reduce the dynamic response of the pavement structure effectively. The conclusions obtained from this work may be benefit to avoiding pavement early damage and extending pavement life-span.

关 键 词：沥青路面 移动随机荷载 Kelvin地基 无限大双层Kirchhoff板 动力响应 积分变换 

分 类 号：U416.01[交通运输工程—道路与铁道工程] U461.54[机械工程—车辆工程]