| Project/Area Number |
12650589
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Building structures/materials
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| Research Institution | Waseda University |
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Principal Investigator |
NISHITANI Akira Waseda University, School of Science and Engineering, Professor, 理工学部, 教授 (70156074)
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2001: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2000: ¥800,000 (Direct Cost: ¥800,000)
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| Keywords | Base isolation / Semiactive control / Variable slip-force level / Damper / Seismic response control / Robust control / 可変スリップレベルダンパ / 絶対加速度 / ロバスト制御 / 中間階免震 / 最適化 / 動特性 / アクティブ制御 |
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| Research Abstract |
A design methodology for structures integrating semiactively-controlled variable friction dampers into base isolation systems is mainly focused on in this research. These variable friction dampers control only their slip-force levels in such a way as to exhibit hystereses having the similar shapes, and therefore they can be referred to as "variable slip-force level dampers."
Relatively simple control algorithm has been proposed utilizing the motion characteristics of base-isolation structures that the acceleration responses of the floors above the base isolators are almost the same each other, in particular for the case of severe earthquake. Base isolation structures incorporating the dampers based on such a control algorithm have been demonstrated to give a good performance in seismic event. These actively-controlled structures have the following beneficial characteristics: (1) Control can be conducted only based on the acceleration response of the base isolators; and (2) Robust control can be provided even if the actual dynamical characteristics of the base isolators are more or less different from the one expected in the design stage.
In addition, the total design methodology for and entire building structure having the proposed semiactively-controlled base isolation system in the middle story is investigated.
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