A mechanical model for elastomeric seismic isolation bearings including the influence of axial load / Sachie Yamamoto in Earthquake engineering structural dynamics, Vol. 38 N°2 (Février 2009)  

Public ISBD [article]  inEarthquake engineering structural dynamics > Vol. 38 N°2 (Février 2009) . - pp. 157-180 Titre : A mechanical model for elastomeric seismic isolation bearings including the influence of axial load Type de document : texte imprimé Auteurs : Sachie Yamamoto, Auteur ; Masaru Kikuchi, Auteur ; Masaiki Ueda Article en page(s) : pp. 157-180 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Seismic isolation  Elastomeric isolation bearing  Large deformation  Axial force  Nonlinear hysteresis model  response analysis Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : For the purpose of predicting the large-displacement response of seismically isolated buildings, an analytical model for elastomeric isolation bearings is proposed. The model comprises shear and axial springs and a series of axial springs at the top and bottom boundaries. The properties of elastomeric bearings vary with the imposed vertical load. At large shear deformations, elastomeric bearings exhibit stiffening behavior under low axial stress and buckling under high axial stress. These properties depend on the interaction between the shear and axial forces. The proposed model includes interaction between shear and axial forces, nonlinear hysteresis, and dependence on axial stress. To confirm the validity of the model, analyses are performed for actual static loading tests of lead-rubber isolation bearings. The results of analyses using the new model show very good agreement with the experimental results. Seismic response analyses with the new model are also conducted to demonstrate the behavior of isolated buildings under severe earthquake excitations. The results obtained from the analyses with the new model differ in some cases from those given by existing models. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121387386/abstract [article] A mechanical model for elastomeric seismic isolation bearings including the influence of axial load [texte imprimé] / Sachie Yamamoto, Auteur ; Masaru Kikuchi, Auteur ; Masaiki Ueda . - pp. 157-180. Génie Civil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 38 N°2 (Février 2009) . - pp. 157-180 Mots-clés : Seismic isolation  Elastomeric isolation bearing  Large deformation  Axial force  Nonlinear hysteresis model  response analysis Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : For the purpose of predicting the large-displacement response of seismically isolated buildings, an analytical model for elastomeric isolation bearings is proposed. The model comprises shear and axial springs and a series of axial springs at the top and bottom boundaries. The properties of elastomeric bearings vary with the imposed vertical load. At large shear deformations, elastomeric bearings exhibit stiffening behavior under low axial stress and buckling under high axial stress. These properties depend on the interaction between the shear and axial forces. The proposed model includes interaction between shear and axial forces, nonlinear hysteresis, and dependence on axial stress. To confirm the validity of the model, analyses are performed for actual static loading tests of lead-rubber isolation bearings. The results of analyses using the new model show very good agreement with the experimental results. Seismic response analyses with the new model are also conducted to demonstrate the behavior of isolated buildings under severe earthquake excitations. The results obtained from the analyses with the new model differ in some cases from those given by existing models. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121387386/abstract

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