ダウンロード数 : ?
ファイル
言語
英語
著者
Okada, Keiichi Institute of Technology, Shimizu Corporation, Tokyo, Japan
内容記述(抄録等)
The seismic isolation mechanism of the core-suspended isolation (CSI) system comprises a double layer of inclined rubber bearings installed on top of a reinforced core structure. A multilevel structure is then suspended from a hat truss or umbrella girder constructed on the seismic isolation mechanism. The first building to use the CSI system was the Safety and Security Center in Tokyo, Japan, whose structural health monitoring system has detected and recorded 231 earthquake motions since 2006, including the 2011 Tohoku Pacific Earthquake (2011-TPE). The present study estimates the dynamic characteristics of this CSI-equipped building in earthquakes, and the effects of the CSI system are revealed via the observed earthquake records. The temporal changes of the fundamental period and damping factor are estimated from the 2011-TPE; the fundamental period increases with the deformation of the isolation level, whereas the fundamental damping factor is only related weakly to that deformation. The 231 observed earthquake records reveal that the CSI system performs seismic isolation by reducing the response acceleration of the suspended structure by roughly a half for peak ground accelerations exceeding 30 cm/s2. Daily microtremor observations are used to diagnose earthquake damage; the fundamental frequencies in each direction remain almost constant and were not changed by the 2011-TPE.
50
9
開始ページ
2259
終了ページ
2276
ISSN(Online)
1096-9845
発行日
2021-07-21
DOI
出版者
John Wiley & Sons, Inc
資料タイプ
学術雑誌論文
ファイル形式
PDF
著者版/出版社版
著者版
業績ID
39167
部局
総合理工学部