Envelope Random Decrement Technique for Identification of Nonlinear Damping of Tall Buildings
Publication: Journal of Structural Engineering
Volume 142, Issue 11
Abstract
To accurately identify the nonlinear damping ratio of tall buildings, the authors propose an envelope random decrement technique (RDT). To verify the accuracy of the envelope RDT for the evaluation of amplitude-dependent nonlinear damping ratio, an iterative computing method, which can accurately work out the response of structures whose parameters depend on the response amplitude in any form, is also proposed. Then, using three different damping models in the numerical simulations, of which the response is calculated by the proposed iterative computing method, the applicabilities of traditional RDT, RDT ranked by peak amplitude, and the envelope RDT presented in this paper for the evaluation of amplitude-dependent nonlinear damping ratio are analyzed and compared. Results indicate that envelope RDT is better than the other two methods for the evaluation of amplitude-dependent nonlinear damping ratio. Finally, the envelope RDT is applied to identify the damping ratios of the Shanghai World Financial Center.
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Acknowledgments
The authors gratefully acknowledge the support from the National Natural Science Foundation of China (91215302).
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Published In
Journal of Structural Engineering
Volume 142 • Issue 11 • November 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jun 27, 2015
Accepted: Mar 31, 2016
Published online: Jun 6, 2016
Published in print: Nov 1, 2016
Discussion open until: Nov 6, 2016
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