检修车轨道位置与导流板对扁平箱梁涡振的影响  

Influence of Maintenance Rail Position and Guide Vanes on Vortex-Induced Vibration Performance of Flat Box Girders

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

机构地区：[1]西南交通大学风工程试验研究中心,四川成都610031 [2]西南交通大学土木工程学院,四川成都610031

出　　处：《西南交通大学学报》2023年第3期535-545,共11页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金(51778547,51678508)。

摘　　要：为研究检修车轨道位置与导流板对宽体扁平箱梁断面涡振性能的影响,以深中通道伶仃洋大桥(大跨度宽体扁平钢箱梁悬索桥)为背景,通过1∶25节段模型风洞试验测试了主梁的涡振响应,并采用计算流体动力学方法(CFD)对断面的二维流场进行了模拟.结果表明:增大检修车轨道与主梁底板边缘之间距离l能够显著提高宽体扁平钢箱梁的涡振性能,当l≥Wb/6(Wb为主梁底部宽度)时,可完全消除宽体扁平箱梁在各风攻角下的涡激振动;在检修车轨道处设置17°倾角的内侧或双侧导流板均能够显著抑制梁体的涡激振动,且抑制效果相同,当l≥Wb/10时,布置导流板可完全消除梁体的涡激振动;增大检修车轨道与主梁底板边缘之间距离以及设置导流板均是通过消除断面下游斜腹板处的尾流漩涡,从而降低梁体受到的周期性涡激力,达到抑制主梁涡振的效果.To study the influence of the maintenance rail position and the guide vanes on the vortex-induced vibration(VIV)performance of the wide flat box girder section,the Lingdingyang Bridge(a long-span suspension bridge with wide flat steel box girder)is taken as an example.The VIV of the main girder is studied using a 1∶25 scale section model wind tunnel test,and the two-dimensional flow field of the cross section is simulated using computational fluid dynamics.The test results show that increasing l(the distance between the maintenance rail and the bottom edge of the main girder)can significantly improve the VIV performance of a wide flat box girder.When l≥Wb/6(Wb is the bottom width of the main girder),the VIV of the girder can be completely eliminated under different wind attack angles.Installing a guide vane with a 17°angle inside or on both sides of the maintenance rail can significantly suppress the VIV of the girder,and the suppression effect is the same.When l≥Wb/10,the installation of the guide vane can completely eliminate the VIV of the girder.The numerical simulation results show that increasing the distance between the maintenance rail and the bottom edge of the girder and setting a guide vane can both significantly reduce the periodic vortex-induced force of the main girder by eliminating the wake vortex at the inclined web downstream of the section,thereby suppressing the VIV of the girder.

关 键 词：宽体扁平钢箱梁 涡激振动 气动措施 检修车轨道 计算流体动力学(CFD) 大比例尺节段模型 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]