Experimental Research on High-Mode Vortex-Induced Vibration (VIV) Amplitude for Large Span Bridges

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (18) : 29-35.

Zhou Shuai1; Chen Zhengqing2; Xugang Hua2; Niu Huawei2

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Abstract

In order to investigate the conversion factor of high-order vortex-induced vibration (VIV) between 3D flexible bridges and 2D rigid sectional models, a set of wind tunnel tests based on 3D elastically multi-supported aeroelastic model are performed, and its high-order VIV responses are recorded; then after, the comparative wind tunnel tests with the sectional models of the same geometric scale and configuration as the aeroelastic model are conducted. The geometrical scale factor between aeroelastic model and sectional model equal to 1, which means these two models have the exactly same cross section dimensions, equivalent mass, natural frequencies and damping. The VIV lock-in phenomena of the aeroelastic and sectional models are observed in wind tunnel tests. The onset velocities, dominant vibration frequencies and lock-in range of these two models are in good accordance with each other. Results from the comparative tests show that the maximum high-order VIV amplitudes of flexible aeroelastic model are roughly 30% higher than those of the 1:1 sectional model.

Key words

Flexible bridges / High-mode vortex-induced vibration / Wind tunnel tests / Vortex-induced vibration amplitude / 3D Effects

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Zhou Shuai1; Chen Zhengqing2; Xugang Hua2; Niu Huawei2. Experimental Research on High-Mode Vortex-Induced Vibration (VIV) Amplitude for Large Span Bridges[J]. Journal of Vibration and Shock, 2017, 36(18): 29-35

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