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Reliability of VS,30 evaluation from surface-wave tests / C. Comina in Journal of geotechnical and geoenvironmental engineering, Vol. 137 N° 6 (Juin 2011) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 137 N° 6 (Juin 2011) . - pp. 579-586 Titre : Reliability of VS,30 evaluation from surface-wave tests Type de document : texte imprimé Auteurs : C. Comina, Auteur ; S. Foti, Auteur ; D. Boiero, Auteur Année de publication : 2011 Article en page(s) : pp. 579-586 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Site  characterization  Seismic  response  Earthquake  engineering  Surface  waves Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : The reliability of surface-wave tests for the evaluation of VS,30 in seismic site characterization is assessed with respect to both uncertainty and accuracy. The discussion of uncertainty is mainly focused on the implications of solution nonuniqueness in inverse problems; only the inversion uncertainty is considered within this work, omitting other possible issues such as nontrivial geological settings (e.g., lateral variations) or the influence of different processing procedures. A Monte Carlo approach has been used to select, through a statistical test, a set of shear-wave velocity models that can be considered equivalent with respect to fitting the experimental dispersion curve according to the information content (dispersion velocities and frequency range) and the experimental uncertainties. This set of equivalent solutions is then used to evaluate the uncertainty in the determination of VS,30. Moreover, comparisons between the results obtained by surface-wave tests and invasive seismic methods are reported to assess the accuracy of VS,30 evaluation by using surface-wave methods. It is shown that, given an adequate investigation depth, the solution nonuniqueness is not a major concern and that the results are comparable in most situations with the results of invasive tests providing an accurate estimate of VS,30, even with simplified approaches. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v137/i6/p579_s1?isAuthorized=no [article] Reliability of VS,30 evaluation from surface-wave tests [texte imprimé] / C. Comina, Auteur ; S. Foti, Auteur ; D. Boiero, Auteur . - 2011 . - pp. 579-586. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 137 N° 6 (Juin 2011) . - pp. 579-586 Mots-clés : Site  characterization  Seismic  response  Earthquake  engineering  Surface  waves Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : The reliability of surface-wave tests for the evaluation of VS,30 in seismic site characterization is assessed with respect to both uncertainty and accuracy. The discussion of uncertainty is mainly focused on the implications of solution nonuniqueness in inverse problems; only the inversion uncertainty is considered within this work, omitting other possible issues such as nontrivial geological settings (e.g., lateral variations) or the influence of different processing procedures. A Monte Carlo approach has been used to select, through a statistical test, a set of shear-wave velocity models that can be considered equivalent with respect to fitting the experimental dispersion curve according to the information content (dispersion velocities and frequency range) and the experimental uncertainties. This set of equivalent solutions is then used to evaluate the uncertainty in the determination of VS,30. Moreover, comparisons between the results obtained by surface-wave tests and invasive seismic methods are reported to assess the accuracy of VS,30 evaluation by using surface-wave methods. It is shown that, given an adequate investigation depth, the solution nonuniqueness is not a major concern and that the results are comparable in most situations with the results of invasive tests providing an accurate estimate of VS,30, even with simplified approaches. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v137/i6/p579_s1?isAuthorized=no