Progressive Incremental Dynamic Analysis for First-Mode Dominated Structures
Publication: Journal of Structural Engineering
Volume 137, Issue 3
Abstract
Incremental dynamic analysis (IDA) is a widely used method for assessing structural performance under earthquake excitations. It enables direct evaluation of the record-to-record variability in structural response through a set of ground-motion records. If the number of ground-motion records is large then, the method becomes computationally demanding. To facilitate its practical application, a precedence list of ground-motion records has been introduced, aiming at selecting the most representative ground-motion records for IDA analysis. In progressive IDA analysis, the IDA curves are computed progressively, starting from the first ground-motion record in the precedence list. After an acceptable tolerance has been achieved, the analysis is terminated. This approach may significantly reduce the computational effort for first-mode-dominated structures, since the seismic response can be computed only for a certain number of ground-motion records from the precedence list to achieve an acceptable level of confidence in the prediction of the summarized (16th, 50th, and 84th fractiles) IDA curves. The proposed implementation of incremental dynamic analysis, which is demonstrated using an example of a 4-story reinforced concrete frame, can also be used for the selection of ground-motion records from a very large set of records, provided that all the records properly represent the seismic scenario for a given site.
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Acknowledgments
The research conducted by the second writer has been funded by the Slovenian Research Agency. This financial support is gratefully acknowledged. The authors are also grateful to Professor Ghafory-Ashtiany and Professor Fajfar, who organized their collaboration.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 137 • Issue 3 • March 2011
Pages: 445 - 455
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Jun 17, 2008
Accepted: Jul 2, 2010
Published online: Jul 16, 2010
Published in print: Mar 1, 2011
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