风速场模型对风-车-桥系统耦合振动特性影响研究

侧向风的作用会增大车—桥耦合振动系统的响应。本文将风、车、桥三者作为一个相互作用、协调工作的耦合振动系统,建立了风—车—桥系统空间耦合分析模型。以京沪高速铁路南京长江大桥为工程背景,采用自行研发的桥梁结构分析软件BANSYS对比研究了不同风速场模型对车辆及桥梁动力响应的影响,剖析了自然大气中平均成份和脉动成份在耦合振动系统中的作用。分析结果表明,在风—车—桥系统耦合振动分析中,采用空间真实相关的脉动风速场是必要的。

Study on wind velocity field for the coupling vibration of wind-vehicle-bridge system

The action of cross wind can increase the dynamic response of the vehicle-bridge system.In this paper,wind,vehicle and bridge are regarded as an interactional coupling vibration system,and the analysis model of the system is presented.Using the self-developed analysis software BANSYS,Nanjing Yangtze River Bridge on Peking-Shanghai high speed railway are analyzed in various wind velocity fields to indicate the effect of wind velocity field model on the vibration characters of the wind-vehicle-bridge system.In addition,the roles of both mean part and fluctuation part of natural wind in the coupling vibration are analyzed.It is showed by the analysis result that using the stochastic wind velocity field with actual spatial correlation is necessary in the coupling vibration analysis of the wind-vehicle-bridge system.