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Article: Nonlinear site effects on strong ground motion at a reclaimed island

TitleNonlinear site effects on strong ground motion at a reclaimed island
Authors
KeywordsArray Records
Ground Motion
Kobe Earthquake
Nonlinearity
Site Response
Soil Liquefaction
Issue Date2000
PublisherNRC Research Press. The Journal's web site is located at http://pubs.nrc-cnrc.gc.ca/cgi-bin/rp/rp2_desc_e?cgj
Citation
Canadian Geotechnical Journal, 2000, v. 37 n. 1, p. 26-39 How to Cite?
AbstractRecently there has been an increased interest in the study of the nonlinearity in soil response for large strains through in situ earthquake observations. In this paper, the downhole array acceleration data recorded at a reclaimed island, Kobe, during the 1995 Kobe earthquake are used to study nonlinear site effects. Particular attention is given to the liquefaction-induced nonlinear effects on the recorded ground motions. By using the spectral ratio and the spectral-smoothing technique, the characteristics of the ground motions are analyzed. It is shown that the peak frequencies in spectral ratios were shifted to lower frequencies when the strongest motions occurred. The increase in the predominant period was caused primarily by a strong attenuation of low-period waves, rather than by amplification of long-period motions. Based on the spectral analyses, the nonlinearity occurring in the shallow liquefied layer during the shaking event is identified, manifested by a significant reduction of the shear modulus. A fully coupled, inelastic, finite element analysis of the response of the array site is carried out. The stress-strain histories of soils and excess pore-water pressures at different depths are calculated. It is suggested that the stress-strain response and the build up of pore pressure are well correlated to the variation of the characteristics of ground motions during the shaking history. | Recently there has been an increased interest in the study of the nonlinearity in soil response for large strains through in situ earthquake observations. In this paper, the downhole array acceleration data recorded at a reclaimed island, Kobe, during the 1995 Kobe earthquake are used to study nonlinear site effects. Particular attention is given to the liquefaction-induced nonlinear effects on the recorded ground motions. By using the spectral ratio and the spectral-smoothing technique, the characteristics of the ground motions are analyzed. It is shown that the peak frequencies in spectral ratios were shifted to lower frequencies when the strongest motions occurred. The increase in the predominant period was caused primarily by a strong attenuation of low-period waves, rather than by amplification of long-period motions. Based on the spectral analyses, the nonlinearity occurring in the shallow liquefied layer during the shaking event is identified, manifested by a significant reduction of the shear modulus. A fully coupled, inelastic, finite element analysis of the response of the array site is carried out. The stress-strain histories of soils and excess pore-water pressures at different depths are calculated. It is suggested that the stress-strain response and the build up of pore pressure are well correlated to the variation of the characteristics of ground motions during the shaking history.
Persistent Identifierhttp://hdl.handle.net/10722/150156
ISSN
2015 Impact Factor: 1.877
2015 SCImago Journal Rankings: 2.093
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorYang, Jen_US
dc.contributor.authorSato, Ten_US
dc.contributor.authorLi, XSen_US
dc.date.accessioned2012-06-26T06:01:54Z-
dc.date.available2012-06-26T06:01:54Z-
dc.date.issued2000en_US
dc.identifier.citationCanadian Geotechnical Journal, 2000, v. 37 n. 1, p. 26-39en_US
dc.identifier.issn0008-3674en_US
dc.identifier.urihttp://hdl.handle.net/10722/150156-
dc.description.abstractRecently there has been an increased interest in the study of the nonlinearity in soil response for large strains through in situ earthquake observations. In this paper, the downhole array acceleration data recorded at a reclaimed island, Kobe, during the 1995 Kobe earthquake are used to study nonlinear site effects. Particular attention is given to the liquefaction-induced nonlinear effects on the recorded ground motions. By using the spectral ratio and the spectral-smoothing technique, the characteristics of the ground motions are analyzed. It is shown that the peak frequencies in spectral ratios were shifted to lower frequencies when the strongest motions occurred. The increase in the predominant period was caused primarily by a strong attenuation of low-period waves, rather than by amplification of long-period motions. Based on the spectral analyses, the nonlinearity occurring in the shallow liquefied layer during the shaking event is identified, manifested by a significant reduction of the shear modulus. A fully coupled, inelastic, finite element analysis of the response of the array site is carried out. The stress-strain histories of soils and excess pore-water pressures at different depths are calculated. It is suggested that the stress-strain response and the build up of pore pressure are well correlated to the variation of the characteristics of ground motions during the shaking history. | Recently there has been an increased interest in the study of the nonlinearity in soil response for large strains through in situ earthquake observations. In this paper, the downhole array acceleration data recorded at a reclaimed island, Kobe, during the 1995 Kobe earthquake are used to study nonlinear site effects. Particular attention is given to the liquefaction-induced nonlinear effects on the recorded ground motions. By using the spectral ratio and the spectral-smoothing technique, the characteristics of the ground motions are analyzed. It is shown that the peak frequencies in spectral ratios were shifted to lower frequencies when the strongest motions occurred. The increase in the predominant period was caused primarily by a strong attenuation of low-period waves, rather than by amplification of long-period motions. Based on the spectral analyses, the nonlinearity occurring in the shallow liquefied layer during the shaking event is identified, manifested by a significant reduction of the shear modulus. A fully coupled, inelastic, finite element analysis of the response of the array site is carried out. The stress-strain histories of soils and excess pore-water pressures at different depths are calculated. It is suggested that the stress-strain response and the build up of pore pressure are well correlated to the variation of the characteristics of ground motions during the shaking history.en_US
dc.languageengen_US
dc.publisherNRC Research Press. The Journal's web site is located at http://pubs.nrc-cnrc.gc.ca/cgi-bin/rp/rp2_desc_e?cgjen_US
dc.relation.ispartofCanadian Geotechnical Journalen_US
dc.subjectArray Recordsen_US
dc.subjectGround Motionen_US
dc.subjectKobe Earthquakeen_US
dc.subjectNonlinearityen_US
dc.subjectSite Responseen_US
dc.subjectSoil Liquefactionen_US
dc.titleNonlinear site effects on strong ground motion at a reclaimed islanden_US
dc.typeArticleen_US
dc.identifier.emailYang, J:junyang@hkucc.hku.hken_US
dc.identifier.authorityYang, J=rp00201en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1139/cgj-37-1-26-
dc.identifier.scopuseid_2-s2.0-0034107162en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0034107162&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume37en_US
dc.identifier.issue1en_US
dc.identifier.spage26en_US
dc.identifier.epage39en_US
dc.identifier.isiWOS:000085969700003-
dc.publisher.placeCanadaen_US
dc.identifier.scopusauthoridYang, J=35605258800en_US
dc.identifier.scopusauthoridSato, T=7406984636en_US
dc.identifier.scopusauthoridLi, XS=25823194900en_US

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