| Titre : | Vertical vibration isolator having piecewise-constant restoring force |
| Auteurs : | Araki, Yoshikazu, Auteur ; Asai, Takehiko, Auteur ; Masui, Takeshi, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Earthquake engineering structural dynamics (Vol. 38 N° 13, Octobre 2009) |
| Article en page(s) : | pp. 1505-1523 |
| Note générale : | Génie Civil |
| Langues : | Anglais |
| Index. décimale : | 624.1 (Infrastructures.Ouvrages en terre. Fondations. Tunnels) |
| Tags : | Vertical seismic isolation ; Constant-force spring ; Shaking table experiment ; Time history analysis |
| 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 |
