INFLUENCE DE L’AMORTISSEMENT SUR LA REPONSE DYNAMIQUE DES STRUCTURES AVEC SYSTEMES D’ISOLATION PARASISMIQUE.

Abstract

To limit the human damage and materials after a seism, one can use devices able to diffuse the energy induced at the time of the earthquake before its transfer to the structure. Generally, we call these devices « the seismic base isolation ». To well understand the effect of these devices of isolation on the responses of the structures, two comparative studies were carried out in this work. The first is the comparison between the responses of a structure with and without the seismic base isolation system and the second is the study of the effect of an isolated structure’s height on these dynamic responses. The incorporation of a damper device with the base isolation system allows to dissipate the maximum of energy, to control the distortions made on the seismic isolators and to carry out a satisfactory compromise between the reduction of the seismic forces and the increase of the distortions in the seismic isolators. Therefore, a parametric study on the effective damper of the seismic isolator system realized in this work allows us to evaluate the influence of the damper of a seismic base isolation system on the dynamic response of the base-isolated structures