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Effects of earthquake magnitude, distance, and site conditions on spectral and pseudospectral velocity relationship

Haizhong Zhang and Yan-Gang Zhao
Effects of earthquake magnitude, distance, and site conditions on spectral and pseudospectral velocity relationship
Bulletin of the Seismological Society of America (July 2021) 111 (6): 3160-3174

Abstract

The spectral velocity (SV) is necessary information in the seismic design of structures with supplemental velocity-dependent dampers, and it is conventionally approximated by the pseudospectral velocity (PSV), which is available in seismic codes. Because of the significant approximation error, it is important to clarify the relationship between the two spectra to establish a suitable formulation to relate SV to PSV. Recent studies have point out that this relationship is influenced not only by the oscillator period and damping ratio but also by earthquake characteristics (Papagiannopoulos et al., 2013; Samdaria and Gupta, 2018). To clarify the seismological effects, in this study, an approach to relate SV to PSV based on the random vibration theory is proposed, and it is verified by comparing its results with those of traditional time-series analysis. The effects of earthquake magnitude and distance as well as site conditions on the relationship between the two spectra are explored based on the proposed approach as well as statistical analysis of recorded seismic motions. It is found that the SV approaches the PSV with increasing magnitudes at long oscillator periods but performs oppositely at short oscillator periods. The demarcation range beyond which the opposite trend is observed varies from (0.07-0.24) to (0.12-0.87) s using the proposed approach and considering the regions of central and eastern North America. The range varies from (0.1-0.15) to (0.3-0.7) s based on the results obtained by the statistical analysis of seismic records in Japan. The observed phenomena were theoretically explained, and the seismological effects were found to be governed by the ground-motion frequency content.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 111
Serial Issue: 6
Title: Effects of earthquake magnitude, distance, and site conditions on spectral and pseudospectral velocity relationship
Affiliation: Kanagawa University, Department of Architecture, Yokohama, Japan
Pages: 3160-3174
Published: 20210713
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 20
Accession Number: 2021-057474
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
N30°00'00" - N45°00'00", E129°00'00" - E147°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202140
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