Spherical Foundation Structural Seismic Isolation System: Development of the New Type Earthquake Resistant Structures

摘要

New spherical foundation structural seismic isolation -SFSSI system has been discovered and first prototype on 23 story building with height 92 m example was presented. The SFSSI system consists of spherical foundation on surface of which rubber bearing is installed to great inverse pendulum isolation mechanism. It is allow to spherical foundation's turning around gyration centre through rubber bearing contact surface as absolute rigid body with one degree of freedom and keeps same behaviour to superstructure. Free and forced vibration of the SFSSI system was investigated. SFSSI system possible keep natural period of structure between 9 sec and 22 sec interval, which is much more than of predominant period ground motion of majority existing earthquakes including near fault zones also. Forced vibration response in time domain of the structure with SFSSI system under the strong Duzce (Turkey) Earthquake also exhibit that system's performance satisfied target aim.