隔震系統的防震效益已於試驗研究及實務應用上被證實，證明於多數情況下隔震系統確實能有效控制傳遞至上部結構的水平剪力，進而降低上部結構之加速度反應。然而，於近斷層地區使用隔震系統仍為一項重大挑戰，由於近斷層地震波具有一長週期的速度脈衝波，且於長週期範圍仍具高地震能量，使隔震系統產生過大的位移，進而傳遞較大水平剪力至上部結構，如此不僅可能造成隔震層破壞，上部結構須承受很大的加速度，甚至可能使上部結構傾覆。
目前的隔震設計大多以設計地震力(DBE)與最大考量地震力(MCE)為設計依據，於近斷層地震作用下隔震設計可能無法發揮理想效益；若兼顧近斷層地震設計，則又可能使隔震系統剛性過大，導致其對中小地震失去隔震效果，因此有必要擬定完整設計對策，設計一個優質的隔震系統得以於小中大地震及近斷層地震中皆能完善發揮隔震效果。
根據上述討論，本研究主要目的為利用雙自由度模型模擬隔震結構受近斷層地震作用下的的動力反應情形，了解隔震結構於近斷層地震作用下面臨的困難，續以於隔震系統加裝黏性阻尼器之設計對策應對 ，利用黏性阻尼器之力學行為特性合併使用具雙線性遲滯特性之鉛心橡膠支承墊，致力發展適當之設計方法使隔震系統得以於小中大地震及近斷層地震中皆能完善發揮隔震效果。

The effectiveness of seismic isolation design in reducing the transmitted force to the superstructure has been well recognized. However, the isolation design against near-fault ground motions often containing long period velocity and/or displacement pulses is still challenging. Dramatic displacement demand on the isolation system and thus unacceptably transmitted forces by the isolation system are the major concerns in the research. Currently, most existing seismic design codes only provide design guidelines for the isolation system against design basis earthquake (DBE) and maximum considered earthquake (MCE), relatively few specification has been given to the isolation design against near-fault ground motions. The dilemma in the isolation design against near-fault ground motions is that, in the attempt to control the maximum displacement by means of larger characteristic strength and added damping (viscous dampers), the effectiveness of the isolation design against the far-field earthquake will then be limited.
In this study, the super structure with different natural periods is modeled as a single degree of freedom system such that the whole structure including the isolation system is modeled as a two degree of freedom system. The isolation system is composed of bilinear hysteretic bearings and viscous dampers. The superstructure is assumed to remain elastic during the ground shaking. The system is designed using the response spectra of measured near-fault ground motions, and inelastic dynamic analysis is conducted to investigate the effectiveness of isolation design. Both the maximum displacement and transmitted force of the isolation system subject to near-fault and far-field ground motions are examined. In addition the responses of the superstructure are also discussed. It is concluded that the isolation design considering only near-fault ground motions will dramatically reduce the isolation effectiveness against far-field quakes. Nevertheless, the incorporation of nonlinear viscous dampers with a damping exponent larger than 1.0 is recommended for future research to meet the goal of design.

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