Development and Application of Short Stroke Seismic Isolated System With Passive-Switching Oil Damper

Abstract eng:
After the Great East Japan Earthquake, apprehension about long-period and long-duration earthquakes and unexpected huge earthquakes leads to growing needs for seismically isolated buildings for the purpose of BCP. Seismically isolated buildings, which can mitigate the displacements of isolation layer to maximize the building areas, are required especially in densely urban areas. Collisions of isolation layer can be prevented by increasing the damping, but seismic isolation performance will become worse against minor and moderate earthquakes. The authors have developed the Short Stroke Seismic Isolation System with passive-switching oil damper in order to address this issue. The newly developed passive-switching oil damper can control the displacement within design limit during major earthquakes and keep the acceleration lower than acceptable level during minor or moderate earthquakes. The lower damping coefficient is firstly assigned to the damper to prepare for minor or moderate earthquakes. The damper mechanically switches from the lower to the higher one when the displacement exceeds a designated level. This isolation system is applied to a new building. The design clearance is 300mm which is almost half of the typical one. The earthquake responses of the building model with the damper installed are simulated. The simulated results show that, the acceleration during minor or moderate earthquake can be reduced by almost 30-40% and the isolation layer would not exhibit such displacement responses to large earthquakes as to exceed the clearance gap.

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