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A metric to screen acceptable velocity and displacement time histories of modified ground motions

Clinton P. Carlson and Dimitrios Zekkos
A metric to screen acceptable velocity and displacement time histories of modified ground motions
Earthquake Spectra (November 2017) 33 (4): 1495-1512

Abstract

Ground motion modification is extensively used in practice to modify a seed acceleration time history in intensity and frequency content until its acceleration response spectrum matches a target spectrum. However, the decision to accept or reject a modified motion commonly relies on a subjective process where the time histories of the modified motion are visually compared to those of the seed motion. Various metrics were used to quantify the similarity between the modified time histories and their scaled counterparts for hundreds of modified ground motions from three different earthquake scenarios. Of the metrics considered, the inverse modified RMSE metric for time histories (imRMSEt) was found most appropriate as it resulted in the least amount of dispersion in the goodness-of-fit values with respect to spectral mismatch. The imRMSEt was then found to be correlated to qualitative rankings assigned to the modified time histories through a visual assessment. The correlation between the quantitative imRMSEt values and qualitative rankings is used to establish threshold values to screen modified velocity and displacement time histories that are likely acceptable or likely unacceptable.


ISSN: 8755-2930
EISSN: 1944-8201
Serial Title: Earthquake Spectra
Serial Volume: 33
Serial Issue: 4
Title: A metric to screen acceptable velocity and displacement time histories of modified ground motions
Affiliation: Geosyntec Consultants, Kennesaw, GA, United States
Pages: 1495-1512
Published: 201711
Text Language: English
Publisher: Earthquake Engineering Research Institute, Berkeley, CA, United States
References: 22
Accession Number: 2021-010360
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
N32°30'00" - N42°00'00", W124°30'00" - W114°15'00"
Secondary Affiliation: University of Michigan, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2021
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