斜拉桥拉索风-雨致振动(Ⅰ):机理分析  

Rain-Wind-Induced Vibration of Cables in Cable-Stayed Bridges(Ⅰ): Mechanism Analysis

作　　者：李永乐[1] 徐幼麟[2] 沈其民[2] 陈波[2,3] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]香港理工大学土木与结构工程系,香港999077 [3]武汉理工大学土木工程与建筑学院,湖北武汉430070

出　　处：《西南交通大学学报》2011年第4期529-534,552,共7页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金资助项目(50778155);教育部新世纪优秀人才支持计划资助项目(NCET-06-0802);四川省杰出青年学科带头人计划资助项目(2009-15-406);香港RGC重点项目(POLYU1-02)

摘　　要：为揭示斜拉索风-雨致振动机理,利用三维绕流空间模型测试的气动力系数,提出了斜拉索风-雨致振动的修正驰振模型;将基于该模型的计算结果与风洞试验结果进行比较,以验证分析模型的有效性,并从能量的角度对斜拉索风-雨致振动的特性进行了探讨.研究表明:斜拉索风-雨致振动本质上是由升力系数负斜率引起的准驰振类型的限幅振动,具有自激和限幅振动双重特性.In order to explore the mechanism of rain-wind-induced vibration of cables,a modified model for rain-wind-induced vibration of cables was proposed based on aerodynamic coefficients tested by a spatial model with three-dimensional ambient flows.Furthermore,the feasibility of the modified model was verified through a comparison between analytical results and the ones obtained by wind tunnel tests.The characteristics of rain-wind-induced vibration were explored from the aspect of vibration energy.The research indicates that the rain-wind-induced vibration of cables is a type of galloping with a limited amplitude induced by negative slopes of aerodynamic lift coefficients and has the properties of self-excitation and limited amplitude vibrations.

关 键 词：风-雨致振动 斜拉索 水路 气动力系数 风洞试验 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]