超高层建筑涡激振动不稳定现象分析

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (12) : 53-59.

论文

超高层建筑涡激振动不稳定现象分析

王磊1,2，蔺新艳1，梁枢果2，闫安志1，邹良浩2

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An analysis on the instability of vortex induced resonance of super high-rise buildings

WANG Lei1，2,LIN Xinyan1，LIANG Shuguo2,YAN Anzhi1,ZOU Lianghao2

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摘要

为了研究方截面超高层建筑涡激振动不稳定现象的特点及原因，进行了多自由度气弹模型风洞试验，对模型表面风压和模型顶部涡振位移进行了同步测量。定性分析了模型表面风压和涡振位移响应的瞬时频率及瞬时相位关系。结果表明，在共振临界风速下，涡振位移幅值并不稳定，涡振位移时程曲线表现为间歇性的“葫芦波”。并且，模型表面风压频率和模型风振频率并不是一个恒定的值，二者时程的相位差一直处于波动状态，即没有构成一方“俘获”另一方的“锁定”现象。说明超高层建筑实际共振并不是理想的稳定共振，瞬时风压频率和位移频率的动态差异是涡激振动不稳定现象的直接原因。

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 highrise buildings has not yet been investigated by the MDOF aeroelastic 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 acrosswind pressure and displacement due to the negative aerodynamic 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”. 

导出引用

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 Lei1，2,LIN Xinyan1，LIANG Shuguo2,YAN Anzhi1,ZOU Lianghao2. An analysis on the instability of vortex induced resonance of super high-rise buildings[J]. Journal of Vibration and Shock, 2018, 37(12): 53-59

参考文献

[1] King R, Prosser M J, Johns D J, et al. On vortex excitation of model piles in water[J]. Journal of Sound & Vibration, 1972, 29(2):169–188.
[2] Sarpkaya T. Fluid forces on oscillating cylinders[J]. Nasa Sti/recon Technical Report A, 1978, 78(3):275-290.
[3] Bearman P W. Vortex Shedding from Oscillating Bluff Bodies[J]. Annual Review of Fluid Mechanics, 2003, 16(1):195-222.
[4] Kwok K C S, Melbourne W H. Wind-induced lock-in excitation of tall structures[J]. Journal of the Structural Division, 1981, 107(1):57-72.
[5] Steckley A, Vickery B J, Isyumov N. On the measurement of motion induced forces on models in turbulent shear flow[J]. Journal of Wind Engineering & Industrial Aerodynamics, 1990, 36(36):339-350.
[6] Vickery B J, Steckley A. Aerodynamic damping and vortex excitation on an oscillating prism in turbulent shear flow[J]. Journal of Wind Engineering & Industrial Aerodynamics, 1993, 49(1):121-140.
[7] B.J.Vickery, A.Stekley, Motion-induced forces on prismatic structures in turbulent shear flow[C] Proceedings of the Second International Conferences on Engineering Aero-Hydroelasticity, Pilsen, Repubic of Czech, 1994:49-54.
[8] Hayashida H, Mataki Y, Iwasa Y. Aerodynamic damping effects of tall building for a vortex induced vibration[J]. Journal of Wind Engineering & Industrial Aerodynamics, 1992, 43(1-3):1973-1983.
[9] Marukawa H, Kato N, Fujii K, et al. Experimental evaluation of aerodynamic damping of tall buildings[J]. Journal of Wind Engineering & Industrial Aerodynamics, 1996, 59(2–3):177-190.
[10] Cheng C M, Lu P C, Tsai M S. Acrosswind aerodynamic damping of isolated square-shaped buildings[J]. Journal of Wind Engineering & Industrial Aerodynamics, 2002, 90(12–15):1743-1756.
[11] 梁枢果, 顾明, 张锋,等. 三角形截面高柔结构横风向振动的风洞试验研究[J]. 空气动力学学报, 2000, 18(2):172-179.
Liang Shuguo, Gu Ming, Zhang Feng, Li Zhengnong, Cao Yinghong. A Study on Across-wind Oscillations of Triangular High-rise Flexible Structures by Wind Tunnel Tests. ACTA Aerodynamica Sinica, 2000, 18(02): 172-179.
[12] 梁枢果, 吴海洋, 陈政清. 矩形超高层建筑涡激共振模型与响应研究[J]. 振动工程学报, 2011, 24(3):240-245.
LIANG Shu-guo WU Hai-yang CHEN Zheng-qing. Investigation on model and responses of vortex-induced resonances of rectangular super high- rise buildings[J]. Journal of vibration engineering, 2011,24(3):240-245.
[13] Huang P, Quan Y, Gu M. Experimental Study of Aerodynamic Damping of Typical Tall Buildings[J]. Mathematical Problems in Engineering, 2013, 2013(2013):1-9.
[14] 全涌, 顾明, 黄鹏. 超高层建筑通用气动弹性模型设计[J]. 同济大学学报(自然科学版), 2000, 29(6):112-116.
QUA N Yong , GU Ming , HUANG Peng. De sign of Super2high Rise Buildings’ Global Aeroelastic Model[J]. Journal of TongJi university. 2001,29(1):122-126
[15] Simiu E, Scanlan R H. Wind effects on structures: an introduction to wind engineering[M]. New York. 1996.
[16]王磊,梁枢果,邹良浩,娄宇.某拟建838 m高楼多自由度气弹模型风洞试验研究[J].湖南大学学报：自然科学版,2015,42(1):9~16(WANG Lei;LIANG Shu-guo;ZOU Liang-hao.Investigation of the Wind-induced Responses of a Tower 838 m High Based on a Multi-degree-of Freedom Aero-elastic Model Wind Tunnel Test[J].Journal of Hunan University(Natural Sciences), ,2015,42(1):9~16)
[17] 顾明,周印,张锋,项海帆,等. 用高频动态天平方法研究金茂大厦的动力风荷载和风振响应[J].建筑结构学报. 2000,21(4):55-61
Gu Ming，Zhou Yin，Zhang Feng,et al．Study on wind loads and wind-induced vibration of the Jinmao Building using high frequency force balance method[J].Journal of Building Structures,2000, 21(4):55-61(in Chinese)．
[18] Kim Y M, You K P, Ko N H. Across-wind responses of an aeroelastic tapered tall building[J]. Journal of Wind Engineering & Industrial Aerodynamics, 2008, 96(8):1307-1319.
[19] A A F, B M N, A K R C, et al. Wind tunnel study of an oscillating tall building[J]. Journal of Wind Engineering & Industrial Aerodynamics, 1995, 57(2-3):249-260.
[20]王磊,梁枢果,邹良浩,等. 超高层建筑多自由度气弹模型的优势及制作方法[J].振动与冲击，2014.33,(17):25~31
WANG Lei，LIANG Shu-guo，ZOU Liang-hao，et al. The advantages and making method of super high-rise building’s multi-DOF aero-elastic model[J]. 2014.33,(17):25~31 (In Chinese)
[21] Tamura T, Dias P P N L. Unstable aerodynamic phenomena around the resonant velocity of a rectangular cylinder with small side ratio[J]. Journal of Wind Engineering & Industrial Aerodynamics, 2003, 91(1–2):127-138.
[22]吴海洋.矩形截面超高层建筑涡激振动风洞试验研究[D].武汉大学博士学位论文，2008.4.
WU Hai-yang.Inverstigation on vortex-induced vibration of rectangular super high-rise building by wind tunnel test[D].Wuhan: School of civil and architectural engineering, Wuhan University, 2008,5
[23]Hans Ruscheweyh ,Thomas Galemann. Full-scale measurements of wind-induced oscillations of chimneys[J]. Journal of Wind Engineering Aerodynamics ,1996(65): 55-62
[24] Wang L, Liang S, Song J, et al. Analysis of vortex induced vibration frequency of super tall building based on wind tunnel tests of MDOF aero-elastic model[J]. Wind & Structures An International Journal, 2015, 21(5):523-536.
[25]王磊,梁枢果,邹良浩,等. 超高层建筑涡振过程中体系振动频率[J].浙江大学学报(工学版)，2014,48(5):805-812
WANG Lei，LIANG Shu-guo，ZOU Liang-hao，et al. Investigation on VIV system vibration frequency of super high-rise building [J]. Journal of Zhejiang University (Engineering Science), 2014,48(5) :805-812