高铁大跨无风嘴扁平箱梁桥涡振性能研究  

Study on Vortex-induced Vibration Performance of Long-span Flat Box Girder Bridge Without Wind Fairings for High-speed Railway

作　　者：许有飞 杨甲锋 胡康 李欢[2] 张艺 XU Youfei;YANG Jiafeng;HU Kang;LI Huan;ZHANG Yi(Chongqing Railway Investment Group,Chongqing 400023,China;School of Civil Engineering Central South University,Changsha 410075,China)

机构地区：[1]重庆铁路投资集团,重庆400023 [2]中南大学土木工程学院,长沙410075

出　　处：《交通科技》2024年第5期100-104,共5页Transportation Science & Technology

摘　　要：由于无风嘴扁平箱梁气动外形对横风敏感,开展相关抗风及气动外形研究具有参考意义。文中通过风洞试验对某无风嘴扁平箱梁桥施工、成桥状态的涡振性能进行研究,并针对实际工程应用,分别加装风嘴、导流板作为抑振措施,利用风洞试验系统对比这2种措施对整体气动特性的影响及抑振效果。实验表明,在施工阶段,最大单悬臂状态-3°和+3°攻角下均发生了竖弯涡振;在成桥状态+3°攻角下仍能观察到明显的涡振现象。烟线试验表明,施工阶段单悬臂状态下该结构发生明显涡振可能与上缘分离再附现象及尾流交替漩涡脱落形成长度有关。加装风嘴后,施工阶段最大单悬臂状态各攻角下的竖弯涡振均得到抑制。加装导流板后,相比无抑振措施工况,涡振已明显减小。加装风嘴和导流板均能进一步提升该箱梁抗涡振性能,其中加装风嘴效果更优。Due to the sensitivity of the aerodynamic shape of flat box girders without wind fairings to cross wind,it is of reference significance to carry out relevant research on wind resistance and aerodynamic shape.The vortex vibration performance of a flat box girder bridge without wind fairings during construction and completion was studied through wind tunnel test,and relevant vibration suppression measures such as wind fairings and guide vanes were installed for practical engineering applications.The effects of the above two measures on the overall aerodynamic characteristics and the effect of vibration suppression were systematically compared.The experimental results show that the vertical bending vortex vibration occurs at both-3°and+3°attack angles in the construction phase of the maximum single cantilever.The vorticity phenomenon can still be observed at+3°angle of attack.The smoke line test shows that the obvious vorticity of the structure in the single cantilever state during construction may be related to the separation and reattachment of the upper edge and the length of the wake alternating vortex shedding.After the installation of the wind fairings,the vertical bending vortex vibration at each angle of attack of the maximum single cantilever state in the construction stage is suppressed.After the installation of the guide vanes,the vortex vibration is significantly reduced compared with the condition without vibration suppression measures.The vortex-induced vibration performance of the box girder can be further improved by installing the wind fairings and guide vanes,and the effect of installing wind fairings are better.

关 键 词：无风嘴扁平箱梁 涡激振动 气动抑振措施 风洞试验 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]