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Vertical vibration isolator having piecewise-constant restoring force / Araki, Yoshikazu in Earthquake engineering structural dynamics, Vol. 38 N° 13 (Octobre 2009) 

Public ISBD [article]  in Earthquake engineering structural dynamics > Vol. 38 N° 13 (Octobre 2009) . - pp. 1505-1523 Titre : Vertical vibration isolator having piecewise-constant restoring force Type de document : texte imprimé Auteurs : Araki, Yoshikazu, Auteur ; Asai, Takehiko, Auteur ; Masui, Takeshi, Auteur Article en page(s) : pp. 1505-1523 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Vertical  seismic  isolation;  Constant-force  spring;  Shaking  table  experiment;  Time  history  analysis Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : We present a vertical vibration isolator having a piecewise-constant restoring force, which belongs to a class of passive and nonlinear vibration isolators. In vertical vibration isolation, direct use of low-stiffness elements leads to unacceptably large deformations due to self-weight. To overcome the difficulty, we apply a combination of constant-force springs, each of which sustains a constant load regardless of its stretch. By arranging the constant-force springs, so that the isolator has a piecewise-constant restoring force, we alleviate the problem of the excessive deformation caused by self-weight, provide stability at the static equilibrium state along with the self-centering capability, and realize a large stroke while keeping the mechanism simple and compact. Further, we attempt to limit the response acceleration within a tolerance regardless of the frequency spectrum and the magnitude of earthquake ground motions. We demonstrate the effectiveness of the present isolator through shaking table tests and numerical simulations. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe [article] Vertical vibration isolator having piecewise-constant restoring force [texte imprimé] / Araki, Yoshikazu, Auteur ; Asai, Takehiko, Auteur ; Masui, Takeshi, Auteur . - pp. 1505-1523. Génie Civil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 38 N° 13 (Octobre 2009) . - pp. 1505-1523 Mots-clés : Vertical  seismic  isolation;  Constant-force  spring;  Shaking  table  experiment;  Time  history  analysis Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : We present a vertical vibration isolator having a piecewise-constant restoring force, which belongs to a class of passive and nonlinear vibration isolators. In vertical vibration isolation, direct use of low-stiffness elements leads to unacceptably large deformations due to self-weight. To overcome the difficulty, we apply a combination of constant-force springs, each of which sustains a constant load regardless of its stretch. By arranging the constant-force springs, so that the isolator has a piecewise-constant restoring force, we alleviate the problem of the excessive deformation caused by self-weight, provide stability at the static equilibrium state along with the self-centering capability, and realize a large stroke while keeping the mechanism simple and compact. Further, we attempt to limit the response acceleration within a tolerance regardless of the frequency spectrum and the magnitude of earthquake ground motions. We demonstrate the effectiveness of the present isolator through shaking table tests and numerical simulations. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe