风嘴外形对钝体钢箱梁铁路斜拉桥涡振性能的影响  

Influence of Wind Fairing Shape on Vortex-induced Vibration Performance of Cable-stayed Railway Bridge with Bluff-body Steel Box Girder

作　　者：黄林[1,2] 董佳慧 王骑 廖海黎[1,2] HUANG Lin;DONG Jiahui;WANG Qi;LIAO Haili(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Key Laboratory for Wind Engineering of Sichuan Province,Chengdu 610031,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]风工程四川省重点实验室,四川成都610031

出　　处：《铁道学报》2023年第10期144-155,共12页Journal of the China Railway Society

基　　金：国家重点研发计划(2022YFC3005304);四川省科技计划(2021YJ0030)。

摘　　要：钝体钢箱梁在大跨度铁路桥梁建设中具有广阔的应用前景,以某大跨度钝体钢箱梁铁路斜拉桥为背景,采用1∶50节段模型风洞试验对该类箱梁的涡振响应进行测试,试验结果表明梁体在各测试风攻角(0°、±3°、±5°)下均存在涡激振动。为抑制涡激振动,通过风洞试验并结合计算流体动力学研究风嘴外形对钝体钢箱梁涡振性能的影响规律。研究表明,采用下行风嘴形式与减小风嘴角度均能提高三角形风嘴的制振能力。在传统三角形风嘴上部设置平台可显著提高风嘴制振性能,增加平台长度与减小风嘴角度均可有效提高该类风嘴的制振效果,但其中平台长度是主导影响因素。进而提出一种带平台的三角形下行风嘴制振措施,并通过1∶25节段模型风洞试验对该措施有效性进行验证。数值模拟结果表明,改变风嘴外形可有效降低主梁表面的旋涡尺寸,从而起到抑振主梁涡振的作用。研究成果可为大跨度钝体钢箱梁铁路桥的涡振制振设计提供参考。The bluff body steel box girder has broad application prospects in the construction of long-span railway bridges.The vortex-induced vibration(VIV)performance of a long-span bluff-body steel box girder cable-stayed railway bridge was studied by using 1∶50 scale section model wind tunnel test.The test results show that the VIV of the main girder occurs under wind attack angles of 0°,±3°and±5°.In order to suppress the VIV of the girder,the influence of wind fairing shape on the VIV performance of bluff-body steel box girder was studied by wind tunnel test and computational fluid dynamics.The test results show that changing the angle orientation and reducing the angle of triangular wind fairing can improve its VIV suppression performance.Setting a platform on the upper part of the traditional triangular wind fairing can significantly improve its VIV suppression ability.Increasing the length of the platform and reducing the wind fairing angle can effectively improve the VIV suppression performance of this type of wind fairing,but with the length of the platform as the dominant factor.Based on the above research,the VIV suppression measure of triangular downward wind fairing with platform was proposed,and the effectiveness of the measure was verified by 1∶25 large-scale section model wind tunnel test.The results of numerical calculations show that changing the shape of the wind fairing can effectively reduce the vortex size on the girder surface,thereby suppressing the VIV of the girder.The research results can provide reference for the VIV performance design of the bluff-body steel box girder of long span cable-stayed railway bridges.

关 键 词：钝体钢箱梁 涡激振动 风嘴外形 CFD 大比例尺节段模型 

分 类 号：U24[交通运输工程—道路与铁道工程]