超长并列斜拉索尾流驰振及其控制风洞试验研究  

Investigation on Wake Galloping and Its Control of Super Long Parallel Stay Cables by Wind Tunnel Test

作　　者：向桂兵 胡腾飞 华旭刚 Xiang Guibin;Hu Tengfei;Hua Xugang(Municipal Design Institute of Guangxi Transportation Science and Technology Group Co.,Ltd,Nanning 530007,China;Hunan Provincial Key Laboratiory of Wind Engineering and Bridge Engineering,College of Civil Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]广西交科集团有限公司市政设计院,南宁530007 [2]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,长沙410082

出　　处：《动力学与控制学报》2023年第5期69-75,共7页Journal of Dynamics and Control

基　　金：国家自然科学基金资助项目(52025082)。

摘　　要：通过气动弹性模型风洞试验,测试了不同风攻角及索间距下,并列超长拉索间的风致振动特性,研究了拉索尾流驰振的运动轨迹及其控制措施.研究表明,拉索发生尾流驰振时,其运动轨迹通常为椭圆轨道,振动主轴与来流方向成一定倾角;运动方向为靠近尾流外侧时,向下游运动,靠近尾流中心时,向上游运动;尾流驰振发生时,拉索从来流中吸收能量,振幅缓慢增大;随着风速增加,振幅增加较快直至出现明显的、振动主轴近似沿来流方向的极限环为止;采用分隔架可以有效抑制尾流驰振的发生,研究结果对并列拉索的抗风设计与振动控制具有指导意义.The wind-induced vibration performance of super long parallel cables was investigated through a series of systematic aeroelastic model wind tunnel tests.The twin cables with different attack angles and spacing ratios were tested,and the characteristics of the motion track and the suppression measures were researched.Studies have shown that the downstream cable motion is elliptical and the vibratory direction is inclined to the wind axis.The direction of the elliptical orbit is such that the cable moves downstream near the outer edges of the wake and upstream nearer the center of the wake during the process of wake galloping.When the wake galloping occurs,the downstream cable absorbs energy from the wind flow at constant velocity and the amplitude changes slowly,while with the increase of wind velocity,the amplitude is growing quickly until an apparent limit cycle is reached.However,this motion consists of large oscillations in an elliptical orbit with the long ellipse axis oriented approximately along the main flow direction rather than inclined to that.Finally,the separator measures are carried out to suppress the wake galloping,and the study results can direct both the wind-resistant design and the vibration control of the parallel cables in cable-stayed bridges.

关 键 词：超长并列拉索 尾流驰振 风洞试验 气弹模型 抑振措施 

分 类 号：TU317[建筑科学—结构工程] U448.27[建筑科学—桥梁与隧道工程]