An analysis on the instability of vortex induced resonance of super high-rise buildings
WANG Lei1，2,LIN Xinyan1，LIANG Shuguo2,YAN Anzhi1,ZOU Lianghao2
1.Shcool of Civil Engineering，Henan Polytechnic University，Jiaozuo 454000, China;
2.School of Civil & Building Engineering, Wuhan University, Wuhan 430072, China
Abstract：Flexible high-rise buildings may be exposed to vortex-induced resonance if the vortex shedding frequency is close to the natural frequency of the building. Although phenomena of instability of VIR have been reported in a few references, the investigation is seldom conducted by the MDOF aero-elastic model, which is considered as an accurate experimental approach, and moreover, the mechanism of the instability VIR of highrise buildings has not yet been investigated by the MDOF aeroelastic model. In order to investigate the instability phenomenon and its mechanism of vortex induced resonance of super high-rise buildings, a series of wind tunnel tests of multi-degree-of-freedom (MDOF) aero-elastic models were carried out. The wind pressure on the surfaces and VIV displacement response at the top of the model were measured synchronously. The differences between frequencies as well as time history phases of wind pressure and displacement were analyzed. The wind tunnel data reveal that VIV displacement responses are not ideal harmonic vibrations, and their amplitudes are fluctuating in different extent. The envelope curve of VIV displacement amplitude is just like “gourd wave”. Vortex induced resonance (VIR) occurs only in certain periods of VIV, so VIV response is intermittent resonance, and even VIR occurs the vibration amplitude is not a stable value , then this phenomenon was named as unstable resonance. Furthermore, it shows that the vibration frequency does not lock the vortex shedding frequency completely in the VIV process. In other words, their frequency cannot maintain equality once they are equal to each other. The key factor of the instability mechanism of VIR is the periodic deviation between transient frequencies of acrosswind pressure and displacement due to the negative aerodynamic stiffness. In other words, their frequencies cannot maintain equality once they are equal to each other, which eventually leads to a transformation of VIV response among “random”, “transition” and “resonance”.
王 磊1,2，蔺新艳1，梁枢果2，闫安志1，邹良浩2. 超高层建筑涡激振动不稳定现象分析[J]. 振动与冲击, 2018, 37(12): 53-59.
WANG Lei1，2,LIN Xinyan1，LIANG Shuguo2,YAN Anzhi1,ZOU Lianghao2. An analysis on the instability of vortex induced resonance of super high-rise buildings. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(12): 53-59.
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