带风屏障并行桥尾流激振响应的尺寸效应研究  

Size effect of wake-induced vibration response of parallel bridges with wind barriers

作　　者：文明 申嘉若 李昂 向活跃[2] 杨晓坤 WEN Ming;SHEN Jiaruo;LI Ang;XIANG Huoyue;YANG Xiaokun(Ningbo Regional Railway Investment and Development Co.,Ltd.,Ningbo 315012,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]宁波市市域铁路投资发展有限公司,浙江宁波315012 [2]西南交通大学土木工程学院,四川成都610031

出　　处：《交通科学与工程》2025年第2期79-85,共7页Journal of Transport Science and Engineering

基　　金：国家自然科学基金资助项目(51978589)。

摘　　要：【目的目的】并行双桥之间的气动干扰,且加装风屏障显著增加了桥梁的特征高度,背风侧桥梁易产生尾流激振,为确保试验的准确性以及工程的安全性,有必要研究并行桥尾流激振响应的尺寸效应。【方法方法】针对某并行斜拉桥,分别进行缩尺比为1∶20和1∶50的主梁节段模型风洞试验,讨论阻尼比、风攻角和主梁外形对尺寸效应的影响。【结果结果】两桥主梁均有较为明显的尺寸效应。与铁路桥大比尺模型相比,其常规比尺模型的振幅峰值更大,阻尼比和风攻角对尾流激振响应的尺寸效应的影响相对较小,这两种模型的风速区间基本接近。与公路桥大比尺模型相比,其常规比尺模型的竖向和扭转振动的锁定区间更宽,振幅更大;在-3°风攻角下,由于铁路桥风屏障的导流作用与常规比尺模型的抖振作用,常规比尺模型的竖向和扭转振幅峰值较低。【结论】同为流线型闭口箱梁,当截面尺寸不同时,其尾流激振的尺寸效应规律也会不同。[PurposesPurposes]Due to aerodynamic interference between parallel bridges and the significant increase in the characteristic height of the bridge after installation of wind barriers,the bridge on the leeward side is prone to wake-induced vibration.It is necessary to study the size effect of wake-induced vibration response of parallel bridges for ensuring test accuracy and project safety.[MethodsMethods]Wind tunnel tests were conducted on parallel cable-stayed bridges with girder section models at scale ratios of 1∶20 and 1∶50.The effects of the damping ratio,wind attack angle,and girder shape on the size effect were discussed.[FindingsFindings]The girders of both bridges have significant size effects.Compared to the large-scale model of the railway bridge,its normal-scale model has a higher peak amplitude,its damping ratio and wind attack angle have a relatively smaller impact on the size effect of the wake-induced vibration response,but wind speed ranges ot the two models are basically similar.Compared to the large-scale model of highway bridge,the vertical and torsional vibration lock-in regions are wider,the amplitudes are larger in the normal-scale model of highway bridge.At a-3°wind attack angle,due to the diversion effect of the wind barrier of the railway bridge and the buffet effect of the normal-scale model,the peaks of vertical amplitude and torsional amplitude in the normal-scale model are lower than those in the large-scale model.[ConclusionsConclusions]The size effect of wake-induced vibration varies depending on the cross-sectional dimensions of the same streamlined closed box girder.

关 键 词：并行桥 尾流激振 尺寸效应 风洞试验 流线型箱梁 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]