Mechanism study on the effect of a stabilizing plate on vortex induced vibration performance of a cable stayed bridge with a side main girder of a belt conveyor

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (8) : 34-44.

LI Chunguang，YAN Hubin，LIANG Aihong，HAN Yan，ZHOU Xuhui

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Abstract

In order to study the mechanism of the effect of stabilizing plate on vortex induced vibration (VIV) performance of side girder cable-stayed bridge with belt conveyor installed on bridge deck, the pressure time-histories date of the edge girder was obtained through the section model pressure test. The mean value of the pressure coefficient, standard deviation ,the power spectrum, and the correlation between local aerodynamic force and overall aerodynamic force of the cross-section on different number of lower stabilizers are comprehensively compared and analyzed, which reveals the vibration suppression mechanism of the edge girder by lower stabilizers. The research results indicated that the cause of the vertical VIV resonance are the strong pressure fluctuation in the front separation and reattachment area of the upper surface, the strong correlation between the front aerodynamic force and the overall aerodynamic force of the lower surface, and the strong pressure fluctuation of the strong correlation in the rear part of the lower surface. Arranging a stabilizer in the bottom of beam can significantly reduce pressure fluctuation, and arranging two stabilizers can further reduce the pressure fluctuation, which can greatly suppress VIV; Three stabilizers arranged at the bottom of beam promote the reattachment of airflow at the downstream faring, the cross-section pressure fluctuation is greatly weakened, and the correlation between the local aerodynamic force and the overall aerodynamic force is significantly destroyed, thus the VIV is suppressed effectively.

Key words

Edge girder / deck conveyor / lower stabilizer / surface pressure / wind tunnel test / mechanism of vortex-induced vibration;

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LI Chunguang，YAN Hubin，LIANG Aihong，HAN Yan，ZHOU Xuhui. Mechanism study on the effect of a stabilizing plate on vortex induced vibration performance of a cable stayed bridge with a side main girder of a belt conveyor[J]. Journal of Vibration and Shock, 2022, 41(8): 34-44

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