交通流对双幅桥涡振性能的影响风洞试验研究  

Wind Tunnel Test of Traffic Flow Effect on Vortex-Induced Vibration of Twin-Deck Bridge

作　　者：谭彪 操金鑫[2,3] 檀小辉 葛耀君[2,3] TAN Biao;CAO Jin-xin;TAN Xiao-hui;GE Yao-jun(China Construction Science and Industry Co.,Ltd.,Shenzhen 518000,China;College of Civil Engineering,Tongji University,Shanghai 200092,China;State Key Laboratory of Disaster Reduction in Civil Engineering,Shanghai 200092,China)

机构地区：[1]中建科工集团有限公司,广东深圳518000 [2]同济大学土木工程学院,上海200092 [3]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《桥梁建设》2022年第6期102-109,共8页Bridge Construction

基　　金：国家自然科学基金项目(52178502);土木工程防灾国家重点实验室自主课题项目(SLDRCE19-B-01)。

摘　　要：为研究交通流对双幅桥涡振性能的影响,以埃及Rod El平行双幅斜拉桥为背景,制作缩尺比1∶60的结合梁和闭口箱梁节段模型进行弹性节段模型风洞试验。考虑不同风攻角,研究自由车流、稳定车流和不稳定车流3种交通流对结合梁和箱梁2种主梁双幅桥涡振的振幅、风速锁定区间及振动状态的影响。结果表明:双幅桥的竖弯涡振对交通流变化更加敏感,而扭转涡振几乎不受交通流变化的影响;对于结合梁双幅桥,交通流对其竖弯涡振的影响并非单调变化,其中稳定车流状态可以减小竖弯涡振响应并缩短涡振风速区间;对于箱梁双幅桥,交通流对其竖弯涡振有显著的抑制作用,且随着车流密度增加,交通流对竖弯涡振响应的抑制作用逐渐增强。桥面通车时主梁间的振动相位差相对无车状态时有所减小。The traffic flow effect on the vortex-induced vibration(VIV)of twin-deck bridges is the focus of this study.The Rod E1 Farag Bridge in Egypt which is a parallel twin-deck cable-stayed bridge is applied as a case.A series of wind tunnel tests were carried out on sectional models of composite girder and box girder with a 1∶60 scale.The effects of three types of traffic flows,namely free,steady and unsteady,on the amplitude,lock-in interval of wind speed and vibration state of the twin-deck bridge were investigated,considering different wind attack angles.It is shown that the vertical bending VIV,rather than the torsional VIV,is sensitive to the changes in traffic flow.On the composite girder twin-deck bridge,the vertical bending VIV and traffic flow do not exhibit a monotonic relationship,when the traffic flow is steady,the vertical bending VIV weakens,and the lock-in interval is shortened.On the box girder twin-deck bridge,traffic flow shows suppression effect on the vertical bending VIV,as the traffic flow density rises,the suppression effect tends to intensify.When there are vehicles travelling on the decks,the vibration phase lag between the two decks are reduced,compared to the empty bridge condition.

关 键 词：双幅桥 结合梁 闭口箱梁 涡振性能 交通流 风攻角 气动干扰效应 风洞试验 

分 类 号：U443.35[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]