Development of the core‐suspended isolation system

Abstract

AbstractA new type of seismic isolation system—called the core‐suspended isolation (CSI) system—has been developed and first building application recently completed. The CSI system consists of a reinforced concrete core on top of which a seismic isolation mechanism composed of a double layer of inclined rubber bearings is installed to create a pendulum isolation mechanism. A multi‐level structure is then suspended from a hat‐truss or an umbrella girder constructed on the seismic isolation mechanism. In this paper, the mechanics of the CSI system are described, followed by a discussion of results of shaking table tests and quasi‐static loading tests of rubber bearings with rotated flanges, and a description of the first building constructed utilizing the CSI system, located in Tokyo, Japan. Copyright © 2010 John Wiley & Sons, Ltd.