C18 Research and Development of Intelligent Floating Isolation System using Earthquake Early Warning
Keisuke MINAGAWA, Satoshi Fujita, Sho Shioda, Delmas Romain, Go TANAKA, Haruo Shimosaka · The Proceedings of the Symposium on the Motion and Vibration Control · 2009
Long period seismic waves having predominant period of from a few seconds to a few ten seconds have recently been observed in various earthquakes. Therefore extension of natural period of isolated structure is being required so as to avoid resonance with long period seismic wave. This paper proposes a new type isolation system having no natural period. The isolation system consists of air bearings as isolation devices, and an Early Earthquake Warning (EEW) system as a trigger of isolation. Air bearing is a bearing that can reduce contact friction between floor and the bearing by thin air film produced by compressed air. This paper describes a concept and components of the isolation system, properties of the air bearing, and results of vibration experiment. Finally good performance of isolation is confirmed.