RESPONSE CONTROL OF SEISMIC ISOLATED BUILDINGS USING DEVELOPED PASSIVE-SWITCHING OIL DAMPER WITH BI-FLOW MECHANISM

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  • MASEKI Ryota
    Building Engineering Research Institute, Technology Center, Taisei Corporation, M.Eng.
  • NAGASHIMA Ichiro
    Building Engineering Research Institute, Technology Center, Taisei Corporation, Dr.Eng.
  • NII Aiko
    Building Engineering Research Institute, Technology Center, Taisei Corporation, M.Eng.
  • KIMURA Yuichi
    Design Division, Taisei Corporation, M.Eng.
  • NISHITANI Akira
    Prof., Dept. of Architecture, Waseda University, Ph.D, Dr.Eng.

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Other Title
  • バイフロー式パッシブ可変オイルダンパーの開発とそれを用いた免震構造物の応答制御
  • バイフローシキ パッシブ カヘン オイルダンパー ノ カイハツ ト ソレ オ モチイタ メンシンコウゾウブツ ノ オウトウ セイギョ

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 The authors have developed a passive-switching oil damper for seismic isolated structures that can control the displacement response of isolation layer within design limit under extreme earthquake events while maintains the acceleration response of superstructure in acceptable level in major and moderate earthquake events. The fundamental performance characteristics of the damper are experimentally tested. Then, the earthquake responses of a seismically isolated building model with the damper installed are simulated. The simulated results show that, with the aid of the damper, the building model would reduce the acceleration responses both to major and moderate quakes, and the isolation layer would not exhibit such displacement responses to extremely large quakes as to exceed the clearance gap. In addition, the rotation resulting from unbalanced switching of the dampers installed in opposite ends of the building is assessed. The rotational responses are confirmed to be in small level.

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