Techno Press

Wind and Structures   Volume 1, Number 1, March 1998, pages 43-57
Wind-induced coupled translational-torsional motion of tall buildings
S. Thepmongkorn and K.C.S. Kwok

Abstract     [Full Text]
    A three-degree-of-freedom base hinged assembly (BHA) for aeroelastic model tests of tall building was developed. The integral parts of a BHA, which consists of two perpendicular plane frames and a flexural pivot, enable this modeling technique to independently simulate building translational and torsional degree-of-freedom. A program of wind tunnel aeroelastic model tests of the CAARC standard tall building was conducted with emphasis on the effect of (a)torsional motion, (b) cross-wind/torsional frequency ratio and (c) the presence of an eccentricity between center of mass and center of stiffness on wind-induced response characteristics. The experimental results highlight the significant effect of coupled translational-torsional motion and the effect of eccentricity between center of mass and center of stiffness on the resultant rms acceleration responses in both along-wind and cross-wind directions especially at operating reduced wind velocities close to a critical value of 10. In addition, it was sound that the vortex shedding process remains the main excitation mechanism in cross-wind direction even in case of tall buildings with coupled translational-torsional motion and with eccentricity.
Key Words
     tall building; coupled motion; aeroelastic modelling technique; cross-wind/torsional frequency ratio; eccentricity; wind-excitation mechanisms.
Department of Civil Engineering, The University of Sydney, NSW 2006, Australia

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