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Investigations into the benefits of base isolation for non-symmetric rigid blocks / A. Contento in Earthquake engineering structural dynamics, Vol. 38 N° 7 (Juin 2009) 

Public ISBD [article]  in Earthquake engineering structural dynamics > Vol. 38 N° 7 (Juin 2009) . - pp. 849-866 Titre : Investigations into the benefits of base isolation for non-symmetric rigid blocks Type de document : texte imprimé Auteurs : A. Contento, Auteur ; A. Di Egidio, Auteur Article en page(s) : pp. 849-866 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Base  isolation;  Non-symmetric  rigid  block;  Security  stops  ;  Eccentricity  ;Impulse  ;  Seismic  excitation Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : In this paper the influence of base isolation on the behaviour of a work of art has been analysed. To make things more realistic, the work of art has been modelled with a non-symmetrical rigid body, sitting on a base that is connected to a visco-elastic device, which represents the passive control system. To prevent the breaking of the isolation device, security stops have been introduced to limit the displacement of the oscillating base to a maximum safety value. All analyses have been carried out comparing the behaviour of the non-isolated and the isolated non-symmetric rigid body subject to impulsive and seismic excitations. The analysis is particularly focused on the effects of the eccentricity of the rigid body and on the presence of the security stops. Generally, base isolation improves the behaviour of the system while the presence of an eccentricity makes the performance of the system worse with respect to the symmetric rigid body. Moreover the security stops, although they preserve the isolator devices, cause a worsening in the performance of the systems. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121510546/abstract [article] Investigations into the benefits of base isolation for non-symmetric rigid blocks [texte imprimé] / A. Contento, Auteur ; A. Di Egidio, Auteur . - pp. 849-866. Génie Civil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 38 N° 7 (Juin 2009) . - pp. 849-866 Mots-clés : Base  isolation;  Non-symmetric  rigid  block;  Security  stops  ;  Eccentricity  ;Impulse  ;  Seismic  excitation Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : In this paper the influence of base isolation on the behaviour of a work of art has been analysed. To make things more realistic, the work of art has been modelled with a non-symmetrical rigid body, sitting on a base that is connected to a visco-elastic device, which represents the passive control system. To prevent the breaking of the isolation device, security stops have been introduced to limit the displacement of the oscillating base to a maximum safety value. All analyses have been carried out comparing the behaviour of the non-isolated and the isolated non-symmetric rigid body subject to impulsive and seismic excitations. The analysis is particularly focused on the effects of the eccentricity of the rigid body and on the presence of the security stops. Generally, base isolation improves the behaviour of the system while the presence of an eccentricity makes the performance of the system worse with respect to the symmetric rigid body. Moreover the security stops, although they preserve the isolator devices, cause a worsening in the performance of the systems. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121510546/abstract