Research on vortex vibration performance and vibration suppression measures of wide streamlined steel box girder with water supply pipe

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (4) : 199-206.

LI Chunguang,LI Hejia,CHEN Sai,HAN Yan

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Abstract

In order to study the effect of different locations of water supply pipes on the vortex-induced vibration (VIV) performance of wide streamline steel box girder and the suppression measures of VIV, a large-span flat steel box girder cable-stayed bridge was taken as the research object, and a rigid section model of steel box girder with a scale of 1:50 was made for wind tunnel tests and numerical simulation calculations. Firstly, the VIV characteristics of the main beam were compared and analyzed when the wind attack angle was 0 ° and ± 3 °, with the water supply pipe installed in the main beam wind faring (Type I) and on the bridge deck (Type II); And the mechanism of the effect of water supply pipes on the VIV performance of the main beam was explored through numerical simulation. Secondly, the influence of structural damping ratio on the VIV performance of I-shaped section main beams was studied; Finally, the effects of aerodynamic measures such as railing ventilation rate and railing flow suppression plate on the VIV performance of the I-section main beam were tested through experiments. The experimental results show that the water supply pipe is a vortex sensitive component, and for the I-shaped section, when the wind attack angle is -3 °, there is no VIV phenomenon in the main beam; When the wind attack angle is 0 °, there is a small amplitude of vortex response; When the wind attack angle is+3 °, there is a significant VIV phenomenon; There is no VIV phenomenon in the main beam of Type II section. The numerical simulation results show that placing the water supply pipe outside the main beam can effectively reduce the size of the upper surface vortex, thereby suppressing the generation of VIV. Increasing the structural damping ratio can effectively suppress the VIV of the main beam; The effect of changing the ventilation rate of the railing to suppress vibration is not significant; Setting up a flow suppression plate has a significant effect on vibration suppression.

Key words

water supply pipe / vortex vibration performance / wind tunnel test / numerical simulation / aerodynamic measures / damping ratio / flow suppression plate / railing

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LI Chunguang,LI Hejia,CHEN Sai,HAN Yan. Research on vortex vibration performance and vibration suppression measures of wide streamlined steel box girder with water supply pipe[J]. Journal of Vibration and Shock, 2024, 43(4): 199-206

References

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