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Wind and Structures
  Volume 18, Number 3, March 2014, pages 295-320
DOI: http://dx.doi.org/10.12989/was.2014.18.3.295
 


Power spectra of wind forces on a high-rise building with section varying along height
D.M. Huang, L.D. Zhu and W. Chen

 
Abstract
    The characteristics of amplitudes and power spectra of X axial, Y axial, and RZ axial (i.e., body axis) wind forces on a 492 m high-rise building with a section varying along height in typical wind directions are studied via a rigid model wind tunnel test of pressure measurement. Then the corresponding mathematical expressions of power spectra of X axial (across-wind), Y axial (along-wind) and torsional wind forces in 315o wind directions are proposed. The investigation shows that the mathematical expressions of wind force spectra of the main structure in across-wind and torsional directions can be constructed by the superimposition of an modified wind spectrum function and a peak function caused by turbulent flow and vortex shedding, respectively. While that in along-wind direction can only be constructed by the former and is similar to wind spectrum. Moreover, the fitted parameters of the wind load spectra of each measurement level of altitude are summarized, and the unified parametric results are obtained. The comparisons of the first three order generalized force spectra show that the proposed mathematical expressions accord with the experimental results well.
 
Key Words
    high-rise building; rigid model wind tunnel test of pressure measurement; wind force spectrum; mathematical expressions; parameters fitting
 
Address
D.M. Huang: School of Civil Engineering, Central South University, Changsha 410075, China; State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China; National Engineering Laboratory for High Speed Railway Construction, Central South University, Changsha 410075, China
L.D. Zhu and W. Chen: State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China
 

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