分离双箱高低雷诺数涡振的试验研究  

Experiments on vortex induced vibration of twin-box bridge sections in high and low Reynolds numbers

作　　者：张伟[1,2] 葛耀君[1] 魏志刚[1] 杨詠昕[1] 

机构地区：[1]同济大学土木工程防灾国家重点试验室,上海200092 [2]路易斯安那州立大学土木与环境工程系,巴吞鲁日70803

出　　处：《空气动力学学报》2008年第3期356-359,共4页Acta Aerodynamica Sinica

基　　金：国家自然科学基金重点项目资助(No.50538050)

摘　　要：为了给现代大跨度桥梁抗风设计提供准确的依据,有对其涡振性能和减振措施的有效性进行分析。在同济大学TJ-1和TJ-3进行的分离双箱高低雷诺数涡振试验,通过四十多个工况试验的详细比较,发现在低雷诺数条件下,涡振存在于较大的阻尼比区间范围内,振幅较大且相应的锁定风速区间较宽;而在高雷诺条件下,涡振仅在阻尼比较小时存在,且其振幅也较小。而导流板的减振效果在高低雷诺数试验中表现出差别,且与攻角有关。In order to better the wind-resistance design of modern large span bridges,it is necessary to inspect the differences of the vortex induce vibrations （VIV） of twin-box bridge sections which is often used now and the discrepancies of its useful mitigation methods in different Reynolds numbers. Experiments with 40 cases were carried out in TJ-1 and TJ-3 wind tunnel with the scale of 1：40 and 1 ： 20. Comparison results show that the amplitudes of VIV which can occur in a rather larger range of damping ratios in low Reynolds number experiments are rather larger and the lock-in range is rather wider. The results also show that the efficiency of the guide vane differs a lot in different Reynolds numbers and different attack angles.

关 键 词：分离双箱 风洞试验 雷诺数 涡激共振 振动控制 

分 类 号：U441.3[建筑科学—桥梁与隧道工程] TU317.1[交通运输工程—道路与铁道工程]