SEISMIC RESPONSE OF MID-STORY ISOLATED BULIDINGS

Abstract

As arise great demands for maintenance of functions and protection of properties, recently many base isolated buildings have been constructed. Depending on the geometrical shape and occupancy type of buildings, mid-story isolation system is more suitable than conventional base isolation system for some buildings. Therefore, it is necessary to shed light on the seismic behavior for buildings with the mid-story isolation system. For the mid-story isolated buildings, nonlinear time history analyses as well as modal analyses with equivalent linear model were carried out. As the results, it is concluded that the mid-story isolation system is effective in reducing the seismic response and if the effect of higher modes related to the location of isolation devices can be properly evaluated, the proposed system is considered to be one of the efficient choices in the seismic design.