Abstract
This paper experimentally evaluates four methods to scale earthquake ground-motions within an ensemble of records to minimize the statistical dispersion and maximize the accuracy in the dynamic peak roof drift demand and peak inter-story drift demand estimates from response-history analyses of nonlinear building structures. The scaling methods that are investigated are based on: (1) ASCE/SEI 7–10 guidelines; (2) spectral acceleration at the fundamental (first mode) period of the structure, S a (T 1); (3) maximum incremental velocity, MIV; and (4) modal pushover analysis. A total of 720 shake-table tests of four small-scale nonlinear building frame specimens with different static and dynamic characteristics are conducted. The peak displacement demands from full suites of 36 near-fault ground-motion records as well as from smaller “unbiased” and “biased” design subsets (bins) of ground-motions are included. Out of the four scaling methods, ground-motions scaled to the median MIV of the ensemble resulted in the smallest dispersion in the peak roof and inter-story drift demands. Scaling based on MIV also provided the most accurate median demands as compared with the “benchmark” demands for structures with greater nonlinearity; however, this accuracy was reduced for structures exhibiting reduced nonlinearity. The modal pushover-based scaling (MPS) procedure was the only method to conservatively overestimate the median drift demands.
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Acknowledgements
This research was funded by the National Science Foundation (NSF) under Grant No. CMMI 0928662. The support of former NSF Program Directors, Dr. K.I. Mehta and Dr. M.P. Singh, is gratefully acknowledged. The authors would like to thank Brad Aagaard (United States Geological Survey), Mahdi Ebrahimian (Kleinfelder, Inc.), and Neal S. Kwong (The Cooper Union) for their review and constructive comments on the paper. The authors would also like to acknowledge the following individuals for their guidance, through informal discussions, in formulating the research questions and the approaches to their investigation: Paulo Bazzurro, University Institute for Superior Studies; Sigmund Freeman, Wiss, Janney, Elstner Associates, Inc.; Vladimir Graizer, U.S. Nuclear Regulatory Commission; Farzad Naeim, John A. Martin and Associates, Inc.; and Thomas Sabol, Englekirk & Sabol Consulting Structural Engineers, Inc. Additionally, Bob St. Henry, NEFF Engineering, helped in the design and construction of the test specimens. The opinions, findings, and conclusions in the paper do not necessarily reflect the views of the organizations or individuals acknowledged above.
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O’Donnell, A.P., Kurama, Y.C., Kalkan, E. et al. Experimental evaluation of four ground-motion scaling methods for dynamic response-history analysis of nonlinear structures. Bull Earthquake Eng 15, 1899–1924 (2017). https://doi.org/10.1007/s10518-016-0052-z
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DOI: https://doi.org/10.1007/s10518-016-0052-z