带悬挑人行道板流线型箱梁涡振性能研究

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振动与冲击 ›› 2014, Vol. 33 ›› Issue (24) : 19-25.

论文

带悬挑人行道板流线型箱梁涡振性能研究

李春光1,2，陈政清2，韩阳1

作者信息 +

Research on the vortex induced vibration performance of streamlined box girder with cantilever walk slab

LI Chun-guang1,2, CHEN Zhen-qing,2 ,HAN Yang1

Author information +

文章历史 +

摘要

为了研究带悬挑人行道板流线型箱梁断面涡振性能，以某大跨悬索桥为工程背景，进行了涡振性能影响因素及气动优化措施的系列节段模型风洞试验。分析了来流攻角、检修轨道等对断面涡振性能的影响，研究移动检修轨道、附加轨道导流板以及底板竖直稳定板等气动措施的制振效果。结果表明此类断面对风攻角较为敏感，随攻角增大涡振性能逐渐变差，同时涡振幅值随阻尼增大呈非线性加速衰减趋势。检修轨道是此种断面形式的涡振敏感构件，检修轨道向箱梁底板中央移动能明显改善涡振性能；轨道附加导流板能进一步的抑制涡振振幅，导流板越宽效果越明显；设置斜腹板导流板对改善本文主梁断面的涡振性能效果不明显。

Abstract

A long-span suspension bridge with streamlined box girder with cantilever walk slab is taken as an engineering example. Based on the series of section model wind tunnel tests, both the vortex induced vibration(VIV) performance of main girder and the mitigation aerodynamic measures are investigated. The influence of attack angles on VIV performance are investigated as well as the effect of guide vane. The aerodynamic measures whose control efficiencies are tested, including moving the maintenance rails，installing guide vanes with different forms．The research results indicate that VIV performance is sensitive to wind attack angles. The VIV performance gradually get worse with the increasing of wind attack angle, and the amplitude of VIV reduce nonlinearly with the increase of structure damp. The maintenance rails are the most sensitive element for the VIV performance of this type of beam section. The movement of maintenance rails towards central of undersurface can improve the VIV performance effectively. The use of the guide vane of maintenance rails can further mitigate the VIV amplitudes, and the wider the guide vane brings better mitigation efficiency. Furthermore, the guide vane attached to the corner of inclined web and bottom plate are not suitable to improve the VIV performance.
measures

导出引用

李春光;陈政清;韩阳. 带悬挑人行道板流线型箱梁涡振性能研究[J]. 振动与冲击, 2014, 33(24): 19-25

LI Chun-guang;CHEN Zhen-qing;;HAN Yang. Research on the vortex induced vibration performance of streamlined box girder with cantilever walk slab [J]. Journal of Vibration and Shock, 2014, 33(24): 19-25