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

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Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (24) : 19-25.

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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

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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.
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Vortex-induced vibration / box girder with cantilever walk slab / section model / aerodynamic

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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