Influence of guide plates on the side of the edge girder on the VIV performance of the &pi;-shaped composite deck section and its vibration suppression mechanism

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (14) : 48-55.

Influence of guide plates on the side of the edge girder on the VIV performance of the π-shaped composite deck section and its vibration suppression mechanism

LEI Wei1,2，WANG Qi1,2，LIAO Haili1,2，LI Zhiguo1,2

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Abstract

The -shaped section with open form is a kind of bluff body section which is prone to vortex-induced vibrations (VIVs). In order to elaborate the VIV performance of a cable-stayed bridge with -shaped composite deck and a main span of 520m, 1:25 large-scale section model wind tunnel tests were carried out to compare the effects of different guide plates arranged on the side of the edge girder on VIV performance of the deck. The experimental results show that significant vertical VIVs exist at -3° and -5° wind attack angles as for the original section. The guide plates on the side of the edge girder with a width of 1.5m and 35° tilt angle can suppress VIVs at all the wind attack angles. Finally, the causes of vertical VIVs and the vibration suppression mechanism of the guide plates are analyzed preliminarily through the numerical simulation of the flow field around the deck. The results show that the guide plates help reduce the size of vortices under the deck, thus mitigating the aerodynamic force and the periodic pressure difference between the upper and lower surfaces of the deck. It is achieved that the factors inducing VIVs are controlled, and VIVs of the deck are suppressed. The results can provide a reference for the design of the aerodynamic countermeasures for -shaped composite deck section.

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vortex-induced vibrations / ?-shaped section / guide plates on the side of the deck / wind tunnel tests / numerical simulations

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LEI Wei1,2，WANG Qi1,2，LIAO Haili1,2，LI Zhiguo1,2. Influence of guide plates on the side of the edge girder on the VIV performance of the π-shaped composite deck section and its vibration suppression mechanism[J]. Journal of Vibration and Shock, 2023, 42(14): 48-55

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