![]() Les caractéristiques des mouvements du plancher ont également un effet sur la performance des dispositifs d’amortissement visqueux. ![]() En outre, les dispositifs d’amortissement visqueux sont parfois utilisés pour améliorer les performances de la superstructure ainsi que le système d’isolation de base. L’intensité de l’accélération du plancher varie en fonction des caractéristiques de vibration du système structurel. Le niveau d’accélération de plancher est un enjeu clé dans la protection des composants non structuraux sensibles à l’accélération. La technique de l’isolation sismique de la base est utilisée avec succès depuis de nombreuses décennies pour protéger les composants structuraux et non structuraux contre les effets dommageables des tremblements de terre en réduisant les accélérations de plancher et les dérives entre les étages. Utilizing supplemental viscous dampers along with lead-rubber-bearing isolators having about 20% of effective damping ratio is meaningless or harmful in relation to floor acceleration and base shear. It is inferred from the study that the most effective way of reducing floor accelerations is to provide more rigidity to the superstructure. Moreover, the effectiveness of supplemental viscous damping devices equipped in parallel with lead-rubber-bearing isolators is studied. ![]() In this paper, the floor acceleration performance of seismically isolated buildings with different lateral load resisting systems such as moment resisting frame, dual system, moment resisting frame plus viscous wall dampers, and dual system plus viscous wall dampers is investigated under near-fault and far-fault earthquake ground motions. The characteristics of the ground motions are also influential in the performance of the viscous damping devices. Furthermore, the viscous damping devices sometimes are used to improve the performance of the superstructure as well as the base isolation system. The intensity of floor acceleration varies depending on the vibration characteristics of the structural system. The level of floor acceleration is a key issue in the protection of acceleration-sensitive nonstructural components. Seismic base isolation technique has been successfully used to protect structural as well as nonstructural components from the damaging effects of earthquakes by reducing floor accelerations and inter-story drifts for many decades.
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