Sensitivity of seismically isolated structures / Politopoulos, Ioannis in Earthquake engineering structural dynamics, Vol. 38 N° 8 (Juillet 2009)  

Public ISBD [article]  inEarthquake engineering structural dynamics > Vol. 38 N° 8 (Juillet 2009) . - pp. 989-1007 Titre : Sensitivity of seismically isolated structures Type de document : texte imprimé Auteurs : Politopoulos, Ioannis, Auteur ; Hoan Khac Pham, Auteur Article en page(s) : pp. 989-1007 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Seismic isolation  vulnerability  Failure probability Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : In this paper we study the sensitivity of seismically isolated structures to a small variability of the earthquake excitation and of some structural properties with respect to the probability of failure and floor spectra. In particular, the influence of the nonlinear behaviour of the isolated superstructure on the vulnerability and on the floor spectra is investigated by means of a series of Monte Carlo simulations of simple two degrees-of-freedom systems. Several types of passive and active isolation systems are examined and three different idealized nonlinear constitutive laws are considered for the superstructure. It is found that, in general, the probability of failure does not depend on the specific cyclic behaviour of the assumed constitutive law and general trends regarding the impact of different isolation devices on vulnerability are established. As for the floor spectra, the influence of moderate nonlinear behaviour of isolated superstructures, with the exception of the case of a non-dissipative elastic nonlinear law, is negligible, contrary to the case of conventional structures. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121560455/abstract [article] Sensitivity of seismically isolated structures [texte imprimé] / Politopoulos, Ioannis, Auteur ; Hoan Khac Pham, Auteur . - pp. 989-1007. Génie Civil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 38 N° 8 (Juillet 2009) . - pp. 989-1007 Mots-clés : Seismic isolation  vulnerability  Failure probability Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : In this paper we study the sensitivity of seismically isolated structures to a small variability of the earthquake excitation and of some structural properties with respect to the probability of failure and floor spectra. In particular, the influence of the nonlinear behaviour of the isolated superstructure on the vulnerability and on the floor spectra is investigated by means of a series of Monte Carlo simulations of simple two degrees-of-freedom systems. Several types of passive and active isolation systems are examined and three different idealized nonlinear constitutive laws are considered for the superstructure. It is found that, in general, the probability of failure does not depend on the specific cyclic behaviour of the assumed constitutive law and general trends regarding the impact of different isolation devices on vulnerability are established. As for the floor spectra, the influence of moderate nonlinear behaviour of isolated superstructures, with the exception of the case of a non-dissipative elastic nonlinear law, is negligible, contrary to the case of conventional structures. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121560455/abstract

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