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Wind and Structures
  Volume 5, Number 1, January 2002, pages 61-80
DOI: http://dx.doi.org/10.12989/was.2002.5.1.061
 


Effects of coupled translational-torsional motion and eccentricity between centre of mass and centre of stiffness on wind-excited tall buildings
S. Thepmongkorn(Thaniland) and K.C.S. Kwok(Australia)

 
Abstract
    Wind tunnel aeroelastic model tests of the Commonwealth Advisory Aeronautical Research Councilrn(CAARC) standard tall building were conducted using a three-degree-of-freedom base hinged aeroelastic(BHA)rnmodel. Experimental investigation into the effects of coupled translational-torsional motion, cross-wind/torsionalrnfrequency ratio and eccentricity between centre of mass and centre of stiffness on the wind-induced responserncharacteristics and wind excitation mechanisms was carried out. The wind tunnel test results highlight thernsignificant effects of coupled translational-torsional motion, and eccentricity between centre of mass andrncentre of stiffness, on both the normalised along-wind and cross-wind acceleration responses for reduced windrnvelocities ranging from 4 to 20. Coupled translational-torsional motion and eccentricity between centre of massrnand centre of stiffness also have significant impacts on the amplitude-dependent effect caused by the vortexrnresonant process, and the transfer of vibrational energy between the along-wind and cross-wind directions.rnThese resulted in either an increase or decrease of each response component, in particular at reduced windrnvelocities close to a critical value of 10. In addition, the contribution of vibrational energy from the torsionalrnmotion to the cross-wind response of the building model can be greatly amplified by the effect of resonancernbetween the vortex shedding frequency and the torsional natural frequency of the building model.
 
Key Words
    coupled motion; complex motion; tall buildings; eccentricity; wind-induced response characteristics; wind excitation mechanisms.
 
Address
S. Thepmongkorn, Construction Engineering and Technology Division, Mahanakorn University of Technology, ThailandrnK.C.S. Kwok, Department of Civil Engineering, Hong Kong University of Science and Technology, Hong Kong and Department of Civil Engineering, University of Sydney, NSW 2600, Australia
 

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