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An empirical model for amplitude prediction on VIV-galloping instability of rectangular cylinders

  • Niu, Huawei (Wind Engineering Research Center of Hunan University) ;
  • Zhou, Shuai (Wind Engineering Research Center of Hunan University) ;
  • Chen, Zhengqing (Wind Engineering Research Center of Hunan University) ;
  • Hua, Xugang (Wind Engineering Research Center of Hunan University)
  • Received : 2014.10.28
  • Accepted : 2015.05.08
  • Published : 2015.07.25

Abstract

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.

Acknowledgement

Supported by : Natural Science Foundation of China

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