Design Input Motion Synthesis Considering the Effect of Uncertainty in Structural and Seismic Parameters by Feature Indexes
Publication: Journal of Structural Engineering
Volume 137, Issue 3
Abstract
Various aspects of earthquakes and structures have inherent uncertainty, and this consideration is essential for seismic design. It makes the input ground-motion selection for seismic design a difficult task, especially when nonlinear dynamic analysis of the structure is utilized. This paper presents a simple scheme to deal with the problem. First, a set of possible ground motions that reflects the effect of uncertainty is considered. The set is described by feature indexes that take into consideration the effect of ground motions on structural behaviors. Second, the ground motion that represents the set in terms of the feature indexes is synthesized as a design ground motion. A scheme to synthesize a ground motion to represent the set is also presented. The ground motion is synthesized by iteratively modifying its time-frequency characteristics using wavelet functions to improve the values of feature indexes. As numerical simulations, design ground motion for a pier structure is synthesized considering uncertainty of ground motions and structural parameters. The synthesized ground motion shows good performance as a design input motion, and the usefulness of the proposed scheme is verified.
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Acknowledgments
The authors would like to express sincere appreciation to the anonymous reviewers for their insightful and informative comments. They enabled us to considerably improve the quality of the paper.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 137 • Issue 3 • March 2011
Pages: 391 - 400
Copyright
© 2011 American Society of Civil Engineers.
History
Received: May 31, 2008
Accepted: Jun 30, 2009
Published online: Feb 15, 2011
Published in print: Mar 1, 2011
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