基于节段模型测振的钢丝绳吊索尾流致振试验研究  

Experimental Investigation on Wake-induced Vibration of the Hangers of Wire Ropes Based on Vibration Meqsurement of Segmental Models

作　　者：黄君 李寿英 邓羊晨 陈政清 HUANG Jun;LI Shouying;DENG Yangchen;CHEN Zhengqing(The Key Laboratory of Wind and Bridge Engineering of Hunan,College of Civil Engineering,Hunan University,Changsha,Hunan 410082,China)

机构地区：[1]湖南大学土木工程学院风工程与桥梁工程湖南省重点实验室

出　　处：《公路工程》2019年第4期1-5,78,共6页Highway Engineering

基　　金：国家自然科学基金项目(51578234);国家重点基础研究发展计划(973)项目(2015CB057702)

摘　　要：为研究大跨度悬索桥吊索发生大幅风致振动机理,设计并制作了外表粗糙的双圆柱试验模型,进行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、0.5<Y≤1.25的空间范围内,尾流索股会发生大幅尾流致振,其振动形式为双自由度椭圆运动,在尾流中心线下方运动方向为逆时针,且稳定运动频率小于结构固有频率。风速大小对尾流索股的运动规律有明显影响;增加结构阻尼比对抑制尾流致振的效果较弱,但对提高尾流致振起振风速有一定的效果。In order to study the mechanism of wind-induced large amplitude vibration of long-span suspension bridge hangers,a rough twin-hangers test model was designed and tested.The wind tunnel test of elastic suspension of wake cable was carried out.The test conditions include along-wind direction X=2.5~11,across-wind direction Y=0~4.The motion response of wake cable in different spatial positions was measured.The influence of structural damping ratio and incoming wind velocity on the wind-induced vibration of wake cable was studied.The results show that there is a large wake-induced vibration in the wake of X≤5 and 0.5<Y≤1.5,the vibration is in the form of two-degree-of-freedom elliptical motion,the direction of movement is counterclockwise below the wake centerline,and its stable motion frequency is less than the structural natural frequency.The wind velocity has a significant influence on the law of movement of wake cable.The effect of increasing structure damping ratio on vibration mitigation is weaker,while it has a certain effect on improving starting wind speed.

关 键 词：桥梁工程 吊索失稳区间 风洞试验 尾流致振 振动控制 

分 类 号：U448.25[建筑科学—桥梁与隧道工程] U441.3[交通运输工程—道路与铁道工程]