摘要
为研究大跨度悬索桥吊索发生大幅风致振动机理,设计并制作了光滑双吊索试验模型,进行了尾流索股弹性悬挂测振风洞试验。试验工况包括顺风向X=2.5-11、横风向Y=0-4;测量了尾流索股在不同空间位置的运动响应规律,研究了结构阻尼比、来流风速等对尾流索股风致振动的影响规律。结果表明:在X≤5.25,Y≤1.5的空间范围内,尾流索股会发生大幅尾流致振,其振动形式包括两种类型:单自由度直线运动和双自由度椭圆运动,其稳定运动频率分别稍大于和小于结构固有频率。风速大小对尾流索股的运动规律有明显影响;阻尼比增大可增加起振风速,但对振幅大小影响不大。
In order to study the mechanism of wind-induced large amplitude vibration of long-span suspension bridge hangers,a smooth twin-hanger test model was designed and the wind tunnel test of the elastically suspended wake cable was carried out.The test conditions include along-wind direction X=2.5-11,across-wind direction Y=0-4.The motion responses of the wake cable in different spatial positions were measured.The influence of the structural damping ratio and incoming wind velocity on the wind-induced vibration of the wake cable was studied.The results show that there will be large wake-induced vibrations in the wake of X≤5.25 and Y≤1.5,which include two types:The single degree of freedom linear motion and the two degree of freedom elliptical motion.The stable frequency of motion is slightly larger or smaller than the natural frequency of the structure.The wind velocity has a significant influence on the feature of the movement of the wake cable.Increasing the structure damping ratio shows little effect on the vibration mitigation,while exhibits certain effect on raising the starting wind speed.
作者
李寿英
黄君
邓羊晨
陈政清
LI Shou-ying;HUANG Jun;DENG Yang-chen;CHEN Zheng-qing(Hunan Provincial Key Laboratory of Wind Engineering and Bridge Engineering,College of Civil Engineering,Hunan University,Changsha 410082,China)
出处
《振动工程学报》
EI
CSCD
北大核心
2019年第1期10-16,共7页
Journal of Vibration Engineering
基金
国家自然科学基金资助项目(51578234)
国家重点基础研究发展计划(973)项目(2015CB057702)
关键词
桥梁工程
风洞试验
尾流致振
振动控制
吊索失稳区间
bridge engineering
wind tunnel tests
wake-induced vibration
vibration mitigation
instable region of hanger
