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| Parameter study on wind-induced vibration of high-rise building with steel tower protrusion |
Zhou Yun1; Liu Chun1,2; Wang Dayang1
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| 1Department of Civil Engineering of GuangZhou University, Guangdong Guangzhou, 510006 2Department of Construction engineering of Guangzhou City Construction College, Guangzhou, 510925 |
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Abstract In this paper, wind-induced vibration responses of high-rise building with steel tower protrusion are studied. AR model is introduced and adopted to simulate fluctuating wind time-series. Dynamic characteristics of main structure, steel tower protrusion and structure with the protrusion in along-wind action are discussed. Influences of six kinds of parameters, such as wind power spectrum, frequency ratio, basic wind pressure and so on, to structural steel tower protrusion are also discussed. Control effects of velocity-dependent dampers to wind–induced vibration responses of the steel tower protrusion are studied comparatively. The study results show that natural frequency of the steel protrusion should be away from the first three frequencies of the main structure so as to reduce whiplash effect. The wind-induced vibration responses of the steel tower protrusion are greater than that of the main structure and will be increase with rise of basic wind-pressure and height of the protrusion, but decrease with rise of span of the protrusion. Velocity-dampers can reduce wind responses of the protrusion effectively. The vibration effect of viscous dampers to the wind responses of the protrusion is better than that of viscoelastic dampers and the vibration effect of nonlinear viscous dampers is better than that of linear viscous dampers.
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Received: 07 September 2009
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2011, Vol. 30 
