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Effects and dynamic characteristics of the core-suspended isolation system assessed by long-term structural health monitoring

机译：长期结构健康监测评估芯悬浮隔离系统的效果和动态特性

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摘要

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/s(2). 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.
机译：芯悬浮隔离（CSI）系统的地震隔离机理包括安装在增强芯结构顶部的倾斜橡胶轴承的双层。然后将多级结构悬挂在地震隔离机制上构造的帽桁架或伞梁。使用CSI系统的第一批建筑是日本东京的安全和安全中心，其结构健康监测系统自2006年以来检测到231个地震动作，包括2011年东北太平洋地震（2011-TPE）。本研究估计该地震地震中该CSI的建筑物的动态特性，通过观察到的地震记录揭示了CSI系统的影响。基本时期和阻尼因子的时间变化估计来自2011-TPE;基本时期随着隔离水平的变形而增加，而基本阻尼因子仅弱与这种变形有关。 231观察到的地震记录表明，CSI系统通过将悬浮结构的响应加速度减小超过30cm / s（2）的峰接地加速度来通过减少悬浮结构的响应加速来执行地震隔离。每日微调观察用于诊断地震损坏;每个方向的基本频率几乎持续，2011-TPE没有改变。

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