Documents disponibles écrits par cet auteur

Examination and reevalaution of SPT-based liquefaction triggering case histories / Ross W. Boulanger in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 8 (Août 2012) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 8 (Août 2012) . - pp. 898–909 Titre : Examination and reevalaution of SPT-based liquefaction triggering case histories Type de document : texte imprimé Auteurs : Ross W. Boulanger, Auteur ; Daniel W. Wilson, Auteur ; I.M. Idriss, Auteur Année de publication : 2012 Article en page(s) : pp. 898–909 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Liquefaction  Earthquakes  Cyclic  loads  Standard  penetration  test Résumé : A standard penetration test (SPT)-based liquefaction case history database for liquefaction triggering criteria is reexamined and reevaluated. The updated database incorporates a number of additional case histories, replaces prior estimates of earthquake magnitudes with current estimates of their moment magnitudes, uses improved estimates of peak ground accelerations when available, and includes a reexamination of the selection and computation of representative SPT (N1)60 values for most case histories. The approach used to select and compute representative SPT (N1)60cs values is illustrated using select case histories. The distribution of the case history data relative to the Idriss-Boulanger triggering correlation is examined for any bias with respect to various parameters and to identify the conditions that are, and are not, well covered by available case history data. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000668 [article] Examination and reevalaution of SPT-based liquefaction triggering case histories [texte imprimé] / Ross W. Boulanger, Auteur ; Daniel W. Wilson, Auteur ; I.M. Idriss, Auteur . - 2012 . - pp. 898–909. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 8 (Août 2012) . - pp. 898–909 Mots-clés : Liquefaction  Earthquakes  Cyclic  loads  Standard  penetration  test Résumé : A standard penetration test (SPT)-based liquefaction case history database for liquefaction triggering criteria is reexamined and reevaluated. The updated database incorporates a number of additional case histories, replaces prior estimates of earthquake magnitudes with current estimates of their moment magnitudes, uses improved estimates of peak ground accelerations when available, and includes a reexamination of the selection and computation of representative SPT (N1)60 values for most case histories. The approach used to select and compute representative SPT (N1)60cs values is illustrated using select case histories. The distribution of the case history data relative to the Idriss-Boulanger triggering correlation is examined for any bias with respect to various parameters and to identify the conditions that are, and are not, well covered by available case history data. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000668

Probabilistic spenetration test–based liquefaction–triggering procedure / Ross Boulanger in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 10 (Octobre 2012) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 10 (Octobre 2012) . - pp.1185–1195. Titre : Probabilistic spenetration test–based liquefaction–triggering procedure Type de document : texte imprimé Auteurs : Ross Boulanger, Auteur ; I.M. Idriss, Auteur Année de publication : 2013 Article en page(s) : pp.1185–1195. Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Liquefaction  Earthquakes  Cyclic  loads  Standard  penetration  test  Probability Résumé : A probabilistic version of the Idriss and Boulanger standard penetration test (SPT)–based liquefaction triggering correlation is derived using a maximum likelihood approach and an updated case history database. Measurement and estimation uncertainties in the cyclic stress ratio (CSR) and SPT (N1)60cs values and the effects of the choice-based sampling bias in the case history database are taken into account. The results of sensitivity analyses show that the position of the most likely triggering curve is well constrained by the case history data and that the magnitude of the total error term is also reasonably constrained. The most likely value for the SD of the error term in the triggering correlation is, however, found to be dependent on the uncertainties assigned to the CSR and (N1)60cs. The results of the sensitivity study appear to provide reasonable bounds on the effects of different interpretations on the positions of the triggering curves for various probabilities of liquefaction. Methods for including model and parameter uncertainties in probabilistic liquefaction analyses are briefly discussed. The derived triggering correlation is compared with relationships developed from cyclic laboratory test results for specimens obtained using frozen sampling techniques. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000700 [article] Probabilistic spenetration test–based liquefaction–triggering procedure [texte imprimé] / Ross Boulanger, Auteur ; I.M. Idriss, Auteur . - 2013 . - pp.1185–1195. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 10 (Octobre 2012) . - pp.1185–1195. Mots-clés : Liquefaction  Earthquakes  Cyclic  loads  Standard  penetration  test  Probability Résumé : A probabilistic version of the Idriss and Boulanger standard penetration test (SPT)–based liquefaction triggering correlation is derived using a maximum likelihood approach and an updated case history database. Measurement and estimation uncertainties in the cyclic stress ratio (CSR) and SPT (N1)60cs values and the effects of the choice-based sampling bias in the case history database are taken into account. The results of sensitivity analyses show that the position of the most likely triggering curve is well constrained by the case history data and that the magnitude of the total error term is also reasonably constrained. The most likely value for the SD of the error term in the triggering correlation is, however, found to be dependent on the uncertainties assigned to the CSR and (N1)60cs. The results of the sensitivity study appear to provide reasonable bounds on the effects of different interpretations on the positions of the triggering curves for various probabilities of liquefaction. Methods for including model and parameter uncertainties in probabilistic liquefaction analyses are briefly discussed. The derived triggering correlation is compared with relationships developed from cyclic laboratory test results for specimens obtained using frozen sampling techniques. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000700