Cross Correlations of Modal Responses of Tall Buildings in Wind-Induced Lateral-Torsional Motion
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Volume 135, Issue 8
Abstract
Recent trends towards developing increasingly taller and irregularly-shaped buildings imply that these complex structures are potentially more responsive to wind excitation. Making accurate predictions of wind loads and their effects on such structures is therefore a necessary step in the design synthesis process. This paper presents a framework for dynamic analysis of the wind-induced lateral-torsional response of tall buildings with three-dimensional (3D) mode shapes. The cross correlation reflecting the statistical coupling among modal responses under spatiotemporally varying dynamic wind excitations has been investigated in detail. The effects of intermodal correlations on the lateral-torsional response of tall buildings with 3D mode shapes and closely spaced natural frequencies are elucidated and a more accurate method for quantifying intermodal cross correlations is analytically developed. Utilizing the wind tunnel derived synchronous multipressure measurements, a full-scale 60-story asymmetric building of mixed steel and concrete construction is used to illustrate the proposed framework for the coupled dynamic analysis and highlight the intermodal correlation of modal responses on the accurate prediction of coupled building acceleration.
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Acknowledgments
The work described in this paper was partially supported by the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. CA04/05.EG01) and the National Natural Science Foundation of China (Project No. 90815023).
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Published In
Journal of Engineering Mechanics
Volume 135 • Issue 8 • August 2009
Pages: 802 - 812
Copyright
© 2009 ASCE.
History
Received: Aug 28, 2007
Accepted: Feb 20, 2009
Published online: Jul 15, 2009
Published in print: Aug 2009
Notes
Note. Associate Editor: Andrew W. Smyth
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