Effect on vortex induced vibration of the guardrails&rsquo; locations of a streamline box girder and the driving mechanism

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (6) : 1-7.

Effect on vortex induced vibration of the guardrails’ locations of a streamline box girder and the driving mechanism

LI Zhen1，LIU Qingkuan1,2,3，JING Hongmiao1,2,3，SUN Yifei1，WANG Yangxue1

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Abstract

Vortex induced vibration （VIV） is easy to occur in long-span bridges, resulting in structural fatigue damage. It is necessary to grasp the influence of girder shape on VIV. To investigate the influence and mechanism of guardrail with different locations on VIV characteristics of streamlined box girder, the vortex induced vibration response, wind pressure distribution, lift coefficient, aerodynamic phase difference and vortex induced vibration contribution coefficient of bridge side railings at five locations were studied through segmental model wind tunnel test. The experimental results show that the inward movement of the railing on the windward side is beneficial to suppress the vertical bending vortex vibration, and the inward movement of the railing on the leeward side will slightly increase the vortex vibration response. The inward movement of the railing on the windward side will reduce the absolute value of the lift of the main beam, increase the dispersion of aerodynamic phase difference, and also reduce the contribution coefficient of vortex induced vibration at each position, which is considered to be the reason for the suppression of VIV.

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vortex induced vibration / guardrail location / wind tunnel test / aerodynamic phase difference / contribution coefficient of vortex vibration

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LI Zhen1，LIU Qingkuan1,2,3，JING Hongmiao1,2,3，SUN Yifei1，WANG Yangxue1. Effect on vortex induced vibration of the guardrails’ locations of a streamline box girder and the driving mechanism[J]. Journal of Vibration and Shock, 2023, 42(6): 1-7

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