Optimal measures for vortex-induced vibration of a bluff body separated twin-box girder

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (7) : 116-122.

LI Yong-le，CHEN Ke-yu，WANG Bin，SUN Hao

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Abstract

With increase in span, wind-resistant performances of bridges are more and more critical. Due to its superior flutter stability, separated twin-box girder has a broad application prospect in bridge construction. But its vertex-induced vibration (VIV) phenomenon is obvious. Although there are a lot of VIV optimization studies for separated twin-box girders, most of them are focused on good streamline type of box girders. The optimization study on VIV of bluff body separated twin-box girders is very scarce. Here, a certain bluff body separated twin-box girder bridge was taken as a study object, wind tunnel tests were conducted to study influences of aerodynamic measures, such as, guide vane, splitter plate and wind fairing on the VIV performance of the main beam cross-section to determine the optimal measure. The results showed that wind fairing can effectively suppress vertical and torsional VIV of bluff body separated twin-box girders; the smaller the wind fairing angle, the better its vibration-suppressing effect.

Key words

bluff body / separated twin-box girder / vertex-induced vibration / guide vane / splitter plate / wind fairing

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LI Yong-le，CHEN Ke-yu，WANG Bin，SUN Hao. Optimal measures for vortex-induced vibration of a bluff body separated twin-box girder[J]. Journal of Vibration and Shock, 2018, 37(7): 116-122

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