Development of the Core-Suspended Isolation System

Abstract eng:
A new type of seismic isolation system – called the core-suspended isolation system (CSI) – has been recently developed and implementation completed in the first building in Tokyo, Japan. The core-suspended isolation 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. An office or residential structure is then suspended from a hat-truss constructed on the seismic isolation mechanism, isolating it from the motion of the core. In this paper the mechanics of the CSI system are described, followed by a discussion of results obtained from shaking table tests conducted on scale models and static loading tests of inclined rubber bearings, and an overview of the first building constructed utilizing the system.

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