宽幅流线型箱梁涡振性能及制振措施研究  

Vortex-Induced Vibration Performance of Wide Streamlined Box Girder and Aerodynamic Countermeasure Research

作　　者：李明[1,2] 孙延国[1,2] 李明水[2] 伍波[1,2] LI Ming;SUN Yanguo;LI Mingshui;WU Bo(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Wind Engineering Key Laboratory of Sichuan Province,Southwest Jiaotong University,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]西南交通大学风工程四川省重点实验室,四川成都610031

出　　处：《西南交通大学学报》2018年第4期712-719,共8页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金资助项目(51408505);交通运输部科技项目(201231835250)

摘　　要：为了抑制宽幅流线型箱梁涡激振动,以青山长江大桥(大跨度宽幅流线型钢箱梁斜拉桥)为背景,通过1∶50节段模型风洞试验,在低阻尼条件下研究了主梁的涡振性能以及不同气动措施包括风嘴、检修车轨道、导流板、抑振板和检修道栏杆对涡振性能的影响.结果表明:采用外形较锐的风嘴可改善主梁的气动性能;通过改变检修车轨道位置、轨道支架高度及在其两侧设置导流板对抑制涡振效果不明显;在防撞栏杆后按隔五封一方式布置抑振板,可以使竖向涡振振幅降低45%;高透风率的圆形截面检修道栏杆可显著改善主梁的涡振性能,使涡振振幅降低63%,并且该措施不会影响桥梁美观性、便于工程应用.通过1∶27大比例尺节段模型风洞试验,对高透风率圆形截面检修道栏杆的抑振措施进行了验证,结果表明该措施可有效抑制宽幅流线型箱梁涡振.To suppress the vortex-induced vibration(VIV)of the wide streamlined box girder,the Qingshan Yangtze River Bridge(a long-span cable-stayed bridge with a wide streamlined box girder)was taken as an example.The study of the VIV performance was carried out through a 1:50 scale section model wind tunnel test.The VIV performance of the girder was studied in a low-damping condition,as well as the effects of various countermeasures on such performance,including wind fairing,inspection vehicle rail,guide vane,vibration mitigation plate,and maintenance way railing.The test results show that a sharp wind fairing is favourable to the VIV performance of the girder.The position of the inspection vehicle rail,the height of rail supporter,and the guide vane slightly suppress the VIV response.The vibration mitigation plate,which was installed behind the anti-collision railing such that five seals off one,can reduce the vertical VIV displacement by 45%.The circular maintenance way railing and the high ventilation rate can improve the VIV of the wide streamlined box girder significantly.In particular,the displacement was reduced by 63%.The recommended railing style does not affect the aesthetic of the bridge and is convenient to apply.A 1∶27 scale section model test was conducted to verify the countermeasure.The test results show that the recommended maintenance way railing can suppress the VIV of the wide streamlined box girder effectively.

关 键 词：流线型箱梁 涡激振动 风洞试验 气动措施 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]