边箱叠合梁涡振性能及抑振措施研究  

Study of Vortex-Induced Vibration Performance and Vibration Suppression Measures for Composite Girder with Edge Boxes

作　　者：段青松 马存明[1,2] 

机构地区：[1]西南交通大学桥梁工程系,四川成都610031 [2]西南交通大学风工程试验研究中心,四川成都610031

出　　处：《桥梁建设》2017年第5期30-35,共6页Bridge Construction

基　　金：国家自然科学基金项目(51778545)~~

摘　　要：为研究边箱叠合梁的涡振抑制措施,优化其涡振性能,以某叠合梁斜拉桥为背景,针对其边箱叠合梁制作主梁节段模型进行风洞试验,研究不同风攻角(0°、±3°、±5)和阻尼比(竖向0.3%、0.6%、0.8%、1.0%,扭转0.5%、1.0%)下主梁的涡振性能,对比有、无人行道栏杆和不同形式封闭人行道栏杆对主梁涡振性能的影响。结果表明:-5°、-3°和0°风攻角下,主梁没有出现涡激振动;+3°和+5°风攻角下,主梁的竖向涡振和扭转涡振最大振幅均远大于规范允许值;主梁的竖向涡振和扭转涡振振幅均随阻尼比的增大而减小,增大阻尼比可以有效抑制主梁的涡振;去掉人行道栏杆后,主梁的竖向涡振消失;对人行道栏杆间隔封闭可以抑制主梁的涡振,相对分散的栏杆封闭方案抑振效果更好,+3°风攻角下较+5°风攻角下抑振效果更优。To investigate the vortex-induced vibration（VIV）suppression measures for the composite girder with edge boxes and optimize the VIV performance of the girder,a composite girder cable-stayed bridge was selected as an example and with reference to the composite girder with edge boxes for the main girder of the bridge,the sectional model for the girder was prepared and the wind tunnel tests were carried out.The VIV performance of the girder under the different wind attack angles（0°,±3°and ±5°）and the different damping ratios（vertically 0.3%,0.6%,0.8%,1.0%and torsionally 0.5%and 1.0%）was studied and the influences of the sidewalk railings,no sidewalk railings and the different closure of the railings on the VIV performance of the girder were compared.The results of the study demonstrate that under the wind attack angles of-5°,-3°and 0°,the VIV does not appear in the composite girder with edge boxes.Under the wind attack angles of＋3°and ＋5°,the maximum amplitude values of the vertical and torsional VIV of the girder are all far greater than the allowable values as provided in the codes,the amplitude values decrease with the increase of the damping ratios and the increase of the damping ratios can effectively suppress the VIV.After the sidewalk railings are removed,the vertical VIV of the girder disappear.The closure of the railings at intervals can suppress the VIV,the suppression effect of the relatively scattering closure of the railings works better and the suppression effect under the wind attack angle of＋3°works even better than that under the wind attack angle of＋5°.

关 键 词：斜拉桥 边箱叠合梁 涡振 风洞试验 抑振措施 风攻角 阻尼比 栏杆 

分 类 号：U448.27[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]