板桁结合梁涡振性能及抑振措施研究  

Vortex-induced vibration performance of plate truss composite girder and its aerodynamic countermeasures

作　　者：王景奇 王雷 华旭刚[2] 杨钻 黄智文[2] WANG Jinqi;WANG Lei;HUA Xugang;YANG Zuan;HUANG Zhiwen(Gaungdong Communication,Planning & Design Institute Co.,Ltd,Guangzhou 510507,China;Key Laboratory for Wind and Bridge Engineering of Hunan Province,Hunan University,Changsha 410082,China)

机构地区：[1]广东省交通规划设计研究院股份有限公司,广东广州510507 [2]湖南大学风工程与桥梁工程湖南省重点实验室,湖南长沙410082

出　　处：《铁道科学与工程学报》2019年第8期2035-2042,共8页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51422806,51278189)

摘　　要：为研究板桁结合梁的涡振性能及抑振措施,以国内某拟建公轨两用斜拉桥为研究对象,通过1:60缩尺比节段模型风洞试验,在低阻尼条件下研究主梁的涡振性能及涡振主要诱因,进一步探究检修道栏杆形式、安装水平翼板以及间隔封闭检修道栏杆对板桁结合梁涡振性能的影响。研究结果表明:该板桁结合梁在成桥状态+3°风攻角下会发生大幅竖向及扭转涡振,而且桥面检修道栏杆和防撞栏杆是引起涡振的主要原因。改变检修道栏杆外形对竖向和扭转涡振的控制效果都不理想;安装水平翼板能够有效抑制竖向涡振,但是对扭转涡振的控制效果不佳;间隔封闭检修道栏杆对主梁竖向及扭转涡振均有较好的控制效果,而且其控制效果与封闭栏杆的方式有关,而非仅取决于透风率的改变。从机理上看,这可能是因为间隔封闭检修道栏杆不仅改变了涡脱方式,而且削弱了涡激力沿跨向的相关性。In order to investigate vortex-induced vibration (VIV) performance of the plate truss-composite girder (PTCG) and its aerodynamic countermeasures,1:60 scale section model tests for a combined highway and railway cable-stayed bridge was carried out in wind tunnel in smooth flow.The cause of VIV was analyzed,and aerodynamic countermeasures were studied.The results show that under the wind attack angles of +3°,large vertical and torsional VIV occur,and the railings of the maintenance ways and crash barriers are the main reason of VIV.The influences of different types of maintenance railings on VIV are not significant.The vertical vortex amplitude can be effectively controlled by installing a certain length of horizontal flange on the top of the upper chord,but the control effect on torsional vibration is weak.On the other hand,adding horizontal flange will significantly change the performance of vertical vortex vibration and increase the vortex vibration range.The vertical and torsional vibration of the section can be well controlled by closing the railings at regular interval.This may be due to the weakening of flow separation after closing the railings,which reduces the formation of vortex shedding.Moreover,closing the railings additional will increase air damping when the main girder vibrates,thus reducing the vibration amplitude of the main girder.

关 键 词：斜拉桥 板桁结合 气动特性 涡振 气动控制 风洞试验 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]