Wind-induced vibration test and aerodynamic optimization of a long-span suspension bridge with steel box girder located in cliffy mountainous areas

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (18) : 241-249.

CHEN Yinggao1,2,KANG Jia1,TANG Haojun1,3,ZHENG Kaifeng1,LI Yongle1,3

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Abstract

In order to understand the wind-resistant performance of a long-span suspension bridge with a steel box girder located in cliffy mountainous areas, a practical engineering was taken as the example. The three-dimensional finite element model of the bridge was established to extract the modal characteristics, and the sectional wind tunnel test was designed accordingly to test the flutter performance of the bridge at different angles of attack. The aerodynamic shape of the steel box girder was optimized in different ways, and the effectiveness of the countermeasures was evaluated based on the critical flutter wind speed and the vortex-induced vibration (VIV) performance. The results show that the bridge with the high crash barrier show worse flutter stability at positive angles of attack. Setting the central vertical stabilizer above the bridge deck or the guide plate above the wind fairings could improve the critical flutter wind speed of the bridge. However, the two countermeasures have different effects on the VIV of the bridge. The set of the stabilizer makes the bridge have the possibility of VIV at both positive and negative angles of attack, while the set of the guide plate makes the bridge have the possibility of VIV at positive angles of attack only. Considering that negative angles of attack are dominant for the bridge site, the latter countermeasure shows more advantages.

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suspension bridge with the box girder / flutter performance / VIV performance / wind tunnel tests / large angles of attack

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CHEN Yinggao1,2,KANG Jia1,TANG Haojun1,3,ZHENG Kaifeng1,LI Yongle1,3. Wind-induced vibration test and aerodynamic optimization of a long-span suspension bridge with steel box girder located in cliffy mountainous areas[J]. Journal of Vibration and Shock, 2023, 42(18): 241-249

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