【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。更多还原

【Abstract】 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 multi-mode responses during wind-rain induced vibration.更多还原