Analysis of vortex induced vibration frequency of super tall building based on wind tunnel tests of MDOF aero-elastic model

• Journal title : Wind and Structures
• Volume 21, Issue 5,  2015, pp.523-536
• Publisher : Techno-Press
• DOI : 10.12989/was.2015.21.5.523
Title & Authors
Analysis of vortex induced vibration frequency of super tall building based on wind tunnel tests of MDOF aero-elastic model
Wang, Lei; Liang, Shuguo; Song, Jie; Wang, Shuliang;
Abstract
To study the vibration frequency of super high-rise buildings in the process of vortex induced vibration (VIV), wind tunnel tests of multi-degree-of-freedom (MDOF) aero-elastic models were carried out to measure the vibration frequency of the system directly. The effects of structural damping, wind field category, mass density, reduced wind velocity ($\small{V_r}$), as well as VIV displacement on the VIV frequency were investigated systematically. It was found that the frequency drift phenomenon cannot be ignored when the building is very high and flexible. When $\small{V_r}$ is less than 8, the drift magnitude of the frequency is typically positive. When $\small{V_r}$ is close to the critical wind velocity of resonance, the frequency drift magnitude becomes negative and reaches a minimum at the critical wind velocity. When $\small{V_r}$ is larger than12, the frequency drift magnitude almost maintains a stable value that is slightly smaller than the fundamental frequency of the aero-elastic model. Furthermore, the vibration frequency does not lock in the vortex shedding frequency completely, and it can even be significantly modified by the vortex shedding frequency when the reduced wind velocity is close to 10.5.
Keywords
super high-rise building;vortex-induced vibration;multi-degree-of-freedom model;aerodynamic stiffness;frequency drift phenomenon;
Language
English
Cited by
1.
Investigation on the unstability of vortex induced resonance of high-rise buildings, Journal of Wind Engineering and Industrial Aerodynamics, 2018, 175, 17
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