隔震技術歷經大量試驗研究及實務應用，已被證實於多數情況下隔震系統能有效隔絕地震，降低上部結構之受力反應，使得隔震技術逐漸被廣泛應用於結構設計。然而，由於近斷層地震具長週期速度脈衝之特性，會造成隔震系統產生過大位移，並傳遞較大的水平剪力至上部結構，不僅可能導致隔震層破壞，甚至使上部結構產生嚴重損壞，因此於近斷層地區使用隔震設計仍為一項重大挑戰。
為有效控制隔震系統於近斷層地震下產生的巨大位移，並同時確保其傳遞水平剪力不會明顯增加，黏性阻尼器於隔震設計的應用是不可或缺的。此外，目前隔震設計並未將近斷層地震納入考量，因此於近斷層地震作用下隔震設計可能無法發揮理想效益；若兼顧近斷層地震進行設計，則可能導致隔震系統週期過短，使其對中小度地震的隔震效果不彰。因此勢必需要發展適當的設計對策，使隔震系統得以在小、中、大地震及近斷層地震作用下均能發揮良好的隔震效能。
根據上述討論，本研究主要目的為利用黏性阻尼器(包含α<1.0、α=1.0及α>1.0之黏性阻尼器)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，並以實際近斷層地震進行設計，試圖發展可以在小、中、大地震及近斷層地震中發揮良好效果的隔震系統。此外，藉由雙自由度模型模擬隔震結構，討論隔震結構以韌性折減降低上部結構設計需求之經濟性及安全性，以證明隔震結構相對傳統耐震結構更具優勢。

The effectiveness of seismic isolation design has been well recognized. However, the isolation design against near-fault ground motions remain challenging, considering that the near-fault ground motions containing long period velocity pulses may result in a dramatic displacement demand on the isolation system and an unacceptable force transmitted to the superstructure. To control the maximum displacement of the isolation system against near-fault ground motions, viscous damping devices are often introduced to the isolation system. However, by so doing, the isolation effectiveness against far-field earthquakes may be questionable on the other side.
In this study, parametric analysis is conducted on the forces transmitted by the isolation system composed of bilinear hysteretic bearings and viscous dampers with various damping exponents. It is concluded that the incorporation of nonlinear viscous dampers with a damping exponent larger than 1.0 will transmit less seismic force to the superstructure when the maximum displacement of the isolation system remains controllable.
In addition, a sample isolated structure is designed using the response spectra of measured near-fault ground motions, and inelastic dynamic analysis is performed to investigate the effectiveness of isolation design against both near-fault and far-field ground motions. Considering the huge demand by near-fault earthquakes, to design superstructure by its pure elastic behavior is not rational. The concept of force-controlled concept is then employed to reduce the transmitted force to the superstructure by ductility reduction factors specified in various design codes. The isolated structure including the isolation system is modeled as a two degree of freedom system for inelastic dynamic analysis. The results show that the maximum displacement at the isolation system is more controllable with the implementation of viscous dampers when subject to near-fault earthquakes, and the isolated structure still remains effective against far-field ground motions.

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