洞庭湖大桥拉索风雨振控制新技术

随着大跨径斜拉桥的不断建设，斜拉索的减振特别是风雨振的控制已成为该类桥梁急需解决的关键问题之一。岳阳洞庭湖大桥建成通车后已发生多次强烈风雨振，在对应用磁流变智能阻尼减振技术控制风雨振研究的基础上，全面评估了该技术控制拉索振动的实际效果，证明该阻尼器是拉索风雨振控制的有效手段。岳阳洞庭湖大桥全桥安装磁流变阴尼器后，加速度响应降低为原加速度的1/20-1/30。

New Technique of Mitigating Wind-Rain-Induced Vibration on Stay Cable of Dongting Lake Bridge

Large amplitude vibration, in particularly wind rain induced vibration on cable stayed bridges can be considered today as one of the most critical problems for this type of bridges. Wind rain induced vibration has occurred many times on Dongting Lake Bridge of Yueyang since the bridge was opened to traffic. A new technique using magnetic rheologocal(MR) dampers to mitigate the vibration of stay cable is proposed. Mitigation performances of MR dampers are evaluated with field tests. Results show that it is very effective to control cable vibration using MR dampers. The technique is implemented totally on Dongting Lake Bridge.