随机车流下的风-汽车-桥梁系统空间耦合振动研究  

Three-dimensional coupling vibration of wind-vehicle-bridge systems under random traffic flow

作　　者：韩万水[1] 陈艾荣[2] 

机构地区：[1]长安大学,陕西西安710064 [2]同济大学,上海200092

出　　处：《土木工程学报》2008年第9期97-102,共6页China Civil Engineering Journal

基　　金：国家自然科学基金(50478109);国家科技支撑计划项目(2006BAG04B00)

摘　　要：在交通荷载观测及统计分析的基础上,获得交通状况的代表性数据,对记录的车型、车重、车距和车速进行统计,在此基础上进行随机车流模拟,编制随机车流模拟程序RTF(Random Traffic Flow),程序中首次全面引入车型、车重、车距和车速4个参数;建立可以考虑任意车辆数目、不同车道以及车辆相向行驶功能的随机车流下的风-汽车-桥梁系统空间耦合振动分析框架,编制相应的分析模块RTFWVB(Wind-Vehicle-Bridge system analysis)。以杭州湾跨海大桥为工程实例,详细研究密集、稀疏运营状态,车流单向、相向行驶以及侧风与车辆移动荷载对桥梁关键部位动力响应的影响。分析表明:密集运营状态下桥梁动力响应明显大于一般运营状态下的相应值;车流方向对桥梁振动影响不大;密集运营状态下车辆移动荷载主要决定桥梁动力响应的均值,而侧风主要影响桥梁动力响应的脉动部分,风速越大波动越显著。Data from traffic investigation, representative of vehicle＇s type, weight, separation and velocity were analyzed to extract its statistical characteristics. A RTF program was compiled using the Monte-Carlo method and MATLAB program, which for the first time takes into account the four parameters, including the type, weight, separation and velocity of vehicles. A state of the art three-dimensional dynamic model of the wind-vehicle-bridge coupling vibration under random traffic flow is presented, which can consider arbitrary number of vehicles, multilanes and opposing traffics. Moreover, the approach is coded into a dynamic analysis module RTFWVB. In the dynamic analysis of the Hangzhou Bay Bridge, the effects of heavy traffic, regular traffic, traffic flow direction, crosswind and moving vehicle loads are discussed. The results indicate that the bridge dynamic responses under heavy traffic are evidently larger than those under regular traffic. Traffic flow direction has minor effect on bridge vibration. The mean values of dynamic responses of the bridge are dominated by moving vehicle loads while the turbulent parts of those are dominated by crosswind, which becomes larger when wind speed increases.

关 键 词：交通荷载观测 随机车流 风-汽车-桥梁系统 动力响应 车流方向 

分 类 号：U441.3[建筑科学—桥梁与隧道工程] U491.25[交通运输工程—道路与铁道工程]