Abstract
In this paper, the authors have developed a new type of horizontal seismic isolation system which has large effect of vibration isolation for ordinary earthquakes and suppresses the resonance of the isolation system due to long-period seismic ground motions. This seismic isolation system is composed of coil spring and two slide rails. This seismic isolation is added a large frictional force beforehand. Frictional force is used to suppress the resonance of the seismic isolation system. The trial seismic isolation table was made, and the effects of vibration suppression of the isolation table were discussed experimentally and numerically.
