Modal-Pushover-Based Ground-Motion Scaling Procedure
Publication: Journal of Structural Engineering
Volume 137, Issue 3
Abstract
Earthquake engineering is increasingly using nonlinear response history analysis (RHA) to demonstrate the performance of structures. This rigorous method of analysis requires selection and scaling of ground motions appropriate to design hazard levels. This paper presents a modal-pushover-based scaling (MPS) procedure to scale ground motions for use in a nonlinear RHA of buildings. In the MPS method, the ground motions are scaled to match to a specified tolerance, a target value of the inelastic deformation of the first-mode inelastic single-degree-of-freedom (SDF) system whose properties are determined by the first-mode pushover analysis. Appropriate for first-mode dominated structures, this approach is extended for structures with significant contributions of higher modes by considering elastic deformation of second-mode SDF systems in selecting a subset of the scaled ground motions. Based on results presented for three actual buildings—4, 6, and 13-story—the accuracy and efficiency of the MPS procedure are established and its superiority over the ASCE/SEI 7-05 scaling procedure is demonstrated.
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Acknowledgments
The first author wishes to acknowledge the generous support of the Earthquake Engineering Research Institute for providing him the 2008 EERI/FEMA NEHRP Professional Fellowship in Earthquake Hazard Reduction for the research study “Preparation of Practical Guidelines to Select and Scale Earthquake Records for Nonlinear Response History Analysis of Structures.” A complete report of this study and essential computer codes for MPS are available online at http://nsmp.wr.usgs.gov/ekalkan/MPS/index.html. We also would like to thank Roger Borcherdt, Praveen Malhotra, Polsak Tothong, and the anonymous reviewer for reading this article and providing their constructive suggestions.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 137 • Issue 3 • March 2011
Pages: 298 - 310
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Jun 20, 2008
Accepted: Aug 10, 2010
Published online: Aug 25, 2010
Published in print: Mar 1, 2011
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