SEISMIC ISOLATION RETROFIT AT MID-STORY AND BASE : Equipments and wall for mid-story isolation

Abstract

Mid-story seismic isolation method was adopted to a 16 storied SRC building whose seismic resistance capacity turned out to be very poor. The building is the training center of Taisei corporation which was built in 1964. On the eighth floor, columns were cut apart to install isolators. In addition, the vertical shafts like equipment piping, elevator and staircase was slitted horizontally as well as the interior and exterior walls. In case of great earthquakes, maximum 18cm horizontal relative displacement occurs on the isolation floor. Vertical shafts and walls should follow such amount of relative displacement. In this report actual details and performances are described on each system.