現今傳統滑動隔震支承（如：摩擦單擺支承）已廣泛的應用於實際建物當中，其對於一般震波有著不錯的隔震效果，但近年文獻亦顯示其在具有長週期成分的近域震波中容易造成似共振現象，因而降低隔震效果及增加隔震層風險。為了確保隔震建物在較大地震力或近域震波作用下之安全性，摩擦單擺支承尺寸通常較大，因而增加製造成本。有鑑於此，有學者提出雙擺變曲率滑動隔震支承（Double Sliding Isolator with Various Curvature，簡稱DSIVC）之構想。此類隔震支承是由兩個上下各自獨立的變曲率支承和一個中間摩擦子組成，相較於傳統FPS支承，DSIVC支承具有較多的靈活性和可變性，可避免降低近域震波中似共振顯現之發生，且在相同位移容量下可縮小尺寸，更為經濟。
本文針對雙擺變曲率滑動隔震支承進行一系列之理論及實驗研究，其中理論研究部分有：（1）、建立DSIVC支承元件在單向與雙向運動中之力與位移關係式（2）、探討DSIVC之摩擦子尺寸效應對單向運動力與位移關係之影響。（3）、建立DSIVC隔震結構在單向與雙向地震波作用之動力方程式與數值分析方法，而在實驗研究部分則有：（1）進行DSIVC支承單向與雙向往復運動下之元件測試。以驗證所建之元件力與位移關係式。（2）、利用前人的單擺變曲支承振動臺實驗資料，利用等效雙擺支承的概念驗證本文所建立之DSIVC隔震分析方法之正確性。本文研究結果顯示，本文所建立之DSIVC支承元件理論公式確可完整模擬在單向與雙向位運動下DSIVC支承之力學行為，經由前人之振動臺實驗資料，則可驗證本文動力分析方法在考慮雙向摩擦力耦合效應下確可模擬DSIVC隔震結構在雙向地震力下之行為。同時由數值模擬中亦可知，DSIVC能夠有效的改善FPS支承在近斷層震波作用下所產生之不良反應，以及在相同支承位移條件下DSIVC能夠有效的縮小單擺隔震支承之尺寸。

Traditional sliding bearings, e.g., friction pendulum system (FPS)isolator, have been widely used for seismic isolation of buildings. Nevertheless, recent literature also reveals that the isolator displacement of this type of isolation system is likely to be considerably amplified in a near-fault earthquake with long-period components. In order to ensure the safety of the isolated building under the sever near-fault earthquake, the size of sliding bearing has be increased, and thus the manufacturing cost is increased as well. In view of this, some scholars have proposed using double sliding isolators with variable curvature (DSIVCs). A typical DSIVC mainly consists of a slider, an upper and a lower sliding surface with variable curvature. Compared with a (FPS)isolator, the DSIVC possesses adaptive nature that helps reduce seismic responses under a near-field earthquake and requires smaller diameter with same isolator displacement capacity. These features make the DSIVC a more economical and efficient isolator.
Both theoretical and experimental studies on the DSIVC are carried out in this thesis. The theoretical study includes: (1) establish the force-displacement formula for the DSIVC in bidirectional motion. (2) Study the dimension effect of DSIVC's slider on the force-displacement relationship. (3) Establish the dynamic equation and numerical method for a DSIVC-isolated structure under bidirectional ground excitations. The experimental study includes: (1) Conduct the element test of the DSIVC under bidirectional motion, in order to verify the force-displacement formula. (2) Using the previous shaking table test data to validate the established analysis method for a DSIVC-isolated structure. The experimental results demonstrate that the DSIVC formula and analysis method established in this thesis is able to simulate the bidirectional mechanical behavior of the DSIVC device alone, and also able to capture the dynamic response of a DSIVC-isolated structure under bidirectional ground excitations.

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