作　　者： ; ; ; ; ;

机构地区： 哈尔滨工业大学

出　　处： 《工程力学》 2009年第3期128-133,139,共7页

摘　　要： 基于平稳随机振动理论和两自由度汽车模型,考虑了高架桥上车辆移动系统与桥面接触处不平顺产生的随机激励,推导得到了在简支梁桥上行驶的车辆通过桥墩所产生的对地面作用力的功率谱密度函数,并采用谐波叠加法模拟了桥墩对地面作用力的时程曲线。通过参数分析和计算仿真,发现汽车行驶速度和路面平整度等级变化对振动幅值的影响显著,桥墩对地面作用力的平均功率谱密度函数有三个峰值,车辆力学模型的自振频率决定了第一个和第二个峰值的位置,桥梁的竖向刚度决定了平均功率谱密度函数的第三个峰值的位置,且频域分布密度主要集中在0Hz―120Hz之间;同时结果表明:对功率谱密度函数的峰值影响比较大的因素有汽车的运行速度和桥面平整度等级。 An analytical method of calculating the power spectral density （PSD） of traffic-induced force acting on the ground through the viaduct systems is presented. The vehicle is modeled as a two-DOF system with linear suspensions and tire flexibility, and the bridge is modeled as a continuous Euler-Bernoulli beam simply supported at both ends. The effect of road surface roughness is also considered. The theory of stationary random process is used to obtain expressions for the PSD of traffic-induced force given the PSD of road surface roughness. The presented numerical results show that roughness class and vehicle velocity have considerable influence on the PSD. The PSD of traffic-induced force has three peak values, the vehicle model determines the first two peak values and the vertical stiffness of pier determines the third one. Dominant frequencies of PSD mainly range from 0 Hz to 120 Hz.

关 键 词： 交通工程 环境振动 随机振动 高架桥 功率谱密度 谐波叠加法

领　　域： [理学] [理学] [建筑科学]