斜拉索风雨振现场观测与振动控制  

On-site observation of wind-rain induced vibration of stay cables and its control

作　　者：陈政清[1] 

机构地区：[1]湖南大学风工程试验研究中心,湖南长沙410082

出　　处：《建筑科学与工程学报》2005年第4期5-10,共6页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(50178013)

摘　　要：介绍了斜拉索风雨振现场观测与振动控制研究的情况。在湖南岳阳洞庭湖大桥上建立了风雨振观测系统,并连续4年进行了长时间现场观测,在风速、风向、雨量等参数对风雨振的影响规律与拉索风雨振振动形态方面有了新的发现。提出了一种多模态振动控制的参数优化方法。进行了拉索—磁流变阻尼器系统的减振性能仿真研究与现场试验研究,全面评估了磁流变阻尼器的实际减振性能。开发了一套磁流变式拉索减振系统,并于2002年在该大桥全桥实施,3年来显示了良好的减振效果。同时针对城市桥梁磁流变减振系统的低压供电线路最易受到人为破坏的问题,设计开发了一种永磁可调式磁流变阻尼器(PMAA-MR),并将其成功应用于湖南长沙洪山庙大桥的拉索减振。On-site observation of wind-rain induced vibration of stay cables and its control were studied. A monitoring system for wind-rain induced vibration was built on the Dongting Lake Bridge and has worked for four years. Some new discoveries were obtained in the influence of wind speed, wind direction and rainfall on wind-rain induced vibration and in the vibration shape of stay cables. A method for parameter optimization based on multimode vibration control was presented. To investigate the performance of MR dampers on mitigating cables vibration, both of numerical simulations and field tests were conducted. A new technique of mitigating cables vibration using MR dampers was exploited and applied on the Dongting Lake Bridge in 2002. The observations of the past three years show that the effectiveness of the mitigating vibration is quite well. To avoid the destruction on purpose of the power supply system to MR dampers, a PMAAMR damper was developed and successfully fitted on the Hongshanmiao Bridge in Changsha.

关 键 词：斜拉索 风雨振 现场观测 磁流变阻尼器 振动控制 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]