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Wind and Structures
  Volume 13, Number 6, November 2010 , pages 499-517

Effects of taper and set-back on wind force and wind-induced response of tall buildings
Yongchul Kim and Jun Kanda

    Advances in structural materials and construction methods have resulted in flexible and light tall buildings, making an assessment of structural safety during strong wind and serviceability/habitability during comparable medium/weak wind important design criteria. So far, lots of studies on suppressing the wind-induced responses have been carried out for tall buildings with aerodynamic modification. Most of the studies on aerodynamic modification have forced on the corner modification, while the studies on taper and set-back are limited. Changes of sectional shape through taper and set-back can modify the flow pattern around the models, encouraging more 3-dimensionalities, which results in reducing the windinduced excitations. This paper discusses the characteristics of overturning moments and wind-induced responses of the tall buildings with height variations. The reduction of mean along-wind and fluctuating across-wind overturning moments are apparent in the uburban area than in urban area. A series of the response analyses, the rms displacement responses of the tall buildings with height variations are reduced greatly, while the rms acceleration responses are not necessarily reduced, showing dependences on wind direction.
Key Words
    aerodynamic modification; overturning moments; power spectra; wind-induced response; response ratio.
Yongchul Kim: Wind Engineering Research Center, Tokyo Polytechnic University, 1583 Iiyama, Atsugi City, Kanagawa Prefecture, 243-0297, Japan
Jun Kanda: Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa City, Chiba Prefecture, 277-8563, Japan

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