斜拉索风雨振响应特性  

Response Characteristics of Wind-Rain Induced Vibration of Stay Cables

作　　者：胡建华[1] 王修勇[2] 陈政清[1] 倪一清[3] 高赞明[3] 

机构地区：[1]湖南大学土木工程学院 [2]湖南科技大学土木工程学院,湖南湘潭411201 [3]香港理工大学土木及结构工程系

出　　处：《中国公路学报》2006年第3期41-48,共8页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(50578063);湖南省教育厅重点项目(04A014)

摘　　要：为了研究斜拉桥拉索风雨振的机理及响应特征,在岳阳洞庭湖大桥建立了由风速仪、雨量计、加速度传感器组成的风雨振现场观测系统,观测到了多次拉索风雨振现象;得到了发生拉索风雨振时风速、风向及雨量的基本条件,分析了风雨振时拉索振动的幅值、主振频率、模态参与特性及空气动力负阻尼比等响应特征。结果显示拉索风雨振很少为单模态振动,大多表现为主振模态和多阶模态参与的振动。In order to investigate the excitation mechanism and response characteristics of wind- rain induced vibration of stay cable, an instrumentation system of wind-rain induced vibration measurement, which consists of anemometer, rain gauge and accelerometer, was installed on the Dongting Lake Bridge, Yueyang, China. Many events of wind-rain induced vibration on stay cable were recorded. The preliminary characteristics of wind-rain induced vibrations, such as mode displacement amplitude, modal participation, aerodynamic negative damping and so on, were presented. The results show that the minority of the responses is nearly a single mode response and the majority of the responses is the participation of the dominant mode and multimode responses during wind-rain induced vibration.

关 键 词：桥梁工程 斜拉索 现场观测 风雨振 响应特征 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]