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Wind and Structures
  Volume 21, Number 1, July 2015 , pages 85-103

An empirical model for amplitude prediction on VIV-galloping instability of rectangular cylinders
Huawei Niu, Shuai Zhou, Zhengqing Chen and Xugang Hua

    Aerodynamic forces of vortex-induced vibration and galloping are going to be coupled when their onset velocities are close to each other, which will induce the cross-wind amplitudes of the structures increased continuously with ever-increasing wind velocities. The main purpose of the present work is going to propose an empirical formula to predict the response amplitude of VIV-galloping interaction. Firstly, two typical mathematical models for the coupled oscillations, i.e., Tamura & Shimada model and Parkinson & Corless model are comparatively summarized. Then, the key parameter affecting response amplitude is determined through comparative numerical simulations with Tamura & Shimada model. For rectangular cylinders with the side ratio from 0.5 to 2.5, which are actually prone to develop the VIV and galloping induced interaction responses, an empirical amplitude prediction formula is proposed after regression analysis on comprehensively collected experimental data with the predetermined key parameter.
Key Words
    rectangular cylinders; VIV-Galloping interaction; amplitude prediction; empirical model
Huawei Niu, Zhengqing Chen and Xugang Hua: Wind Engineering Research Center of Hunan University, Changsha, Hunan, China
Shuai Zhou:Wind Engineering Research Center of Hunan University, Changsha, Hunan, China;
China Railway Eryuan Engineering Group Co.Ltd, Chengdu, Sichuan, China

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