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Amplitude-scaled versus spectrum-matched ground motions for seismic performance assessment / Yeong Ae Heo in Journal of structural engineering, Vol. 137 N° 3 (Mars 2011) 

Public ISBD [article]  in Journal of structural engineering > Vol. 137 N° 3 (Mars 2011) . - pp. 278-288 Titre : Amplitude-scaled versus spectrum-matched ground motions for seismic performance assessment Type de document : texte imprimé Auteurs : Yeong Ae Heo, Auteur ; Sashi K. Kunnath, Auteur ; Norman Abrahamson, Auteur Année de publication : 2011 Article en page(s) : pp. 278-288 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Interstory  drift  Ground  motion  modification  Probability  distribution  Reinforced  concrete  Seismic  simulation Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The need to consider only a small number of ground motions combined with the complexities of response sensitivity to both modeling choices and ground motion variability calls for an assessment of current ground motion selection and modification methods used in seismic performance evaluation of structures. Since the largest source of uncertainty and variability arises from ground motion selection, this study examines the suitability of two ground motion modification (GMM) schemes: magnitude scaling (wherein the ground motion is uniformly scaled so that the resulting spectrum matches the amplitude of the design spectrum at the structural fundamental period) and spectrum matching. Comprehensive nonlinear time-history (NTH) simulations of two reinforced concrete moment frame buildings are carried out to evaluate the GMM approaches in the context of seismic demand prediction. Findings from the investigation indicate that spectrum matching is generally more stable than scaling both in terms of the bias as well as the resulting dispersion in the predicted demands. It is also concluded that seven ground motions are inadequate to establish median demands for taller frames where multiple modes influence structural response. Both methods are found to be sensitive to the choice of records for the cases investigated in this study. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i3/p278_s1?isAuthorized=no [article] Amplitude-scaled versus spectrum-matched ground motions for seismic performance assessment [texte imprimé] / Yeong Ae Heo, Auteur ; Sashi K. Kunnath, Auteur ; Norman Abrahamson, Auteur . - 2011 . - pp. 278-288. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 137 N° 3 (Mars 2011) . - pp. 278-288 Mots-clés : Interstory  drift  Ground  motion  modification  Probability  distribution  Reinforced  concrete  Seismic  simulation Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The need to consider only a small number of ground motions combined with the complexities of response sensitivity to both modeling choices and ground motion variability calls for an assessment of current ground motion selection and modification methods used in seismic performance evaluation of structures. Since the largest source of uncertainty and variability arises from ground motion selection, this study examines the suitability of two ground motion modification (GMM) schemes: magnitude scaling (wherein the ground motion is uniformly scaled so that the resulting spectrum matches the amplitude of the design spectrum at the structural fundamental period) and spectrum matching. Comprehensive nonlinear time-history (NTH) simulations of two reinforced concrete moment frame buildings are carried out to evaluate the GMM approaches in the context of seismic demand prediction. Findings from the investigation indicate that spectrum matching is generally more stable than scaling both in terms of the bias as well as the resulting dispersion in the predicted demands. It is also concluded that seven ground motions are inadequate to establish median demands for taller frames where multiple modes influence structural response. Both methods are found to be sensitive to the choice of records for the cases investigated in this study. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i3/p278_s1?isAuthorized=no