過去多次災害性大地震中，已顯示隔震構造物之耐震能力優於傳統構造物，然而藉由傳統隔震支承延長主結構自然振動週期降低引致地震力，卻易於近斷層地震中導致共振之負面效果，緣此，配合總計畫之研究課題，本子計畫擬運用新開發之變頻式摩擦單擺支承(VFPS)於橋梁結構系統，避開近斷層震波下之可能共振反應，同時降低橋面版位移，避免伸縮縫處發生嚴重碰撞與P-delta效應，另加入抗拉拔裝置避免上下部結構分離。研究標的包含二維與三維之等高橋墩與不等高橋墩橋梁，除採用非線性動力歷時分析進行數值模擬與設計含VFPS之橋梁，亦進行振動台實驗驗證VFPS隔震性能及抗拉拔裝置之有效性。研究內容中將發展一套簡單、強健且高效率之非線性動力歷時分析方法，適用於含VFPS等非線性支承之複雜結構系統，同時結合VFPS與抗拉拔裝置之支承系統，以及VFPS支承系統之合理設計參數建議，將有利於推廣本支承系統至橋梁實務界，作為新建橋梁、舊橋耐震能力提升以及災後橋梁復建時之另一項新選擇。本子計畫研究課題屬於「4-2新材料新工法新技術於地震工程之應用」與「4-6 近斷層震波對地震工程影響之應用研究」，內容則包含課題4-2之第1項利用新材料、技術與工法以提昇構造物之耐震能力、第3項震災後可快速復健構造系統之研發、第4項具多功性能特之先進隔減震元件或系統研發與第6項採用新材料、技術與工法之結構耐震性能與減震效能評估，以及課題4-6之第3項近斷層震波對橋梁結構之耐震影響研究與第9項近斷層震波對含隔減震結構之影響評估與規範檢討。 ;In the past catastrophic earthquakes, isolated structures have been verified to have high seismic performance than conventional non-isolated structures. However, although the induced seismic loading is reduced through the elongated natural period, the unexpected larger response may occur during near-field ground motions. The objective of this project is to apply the new variable-frequency friction pendulum system (VFPS) to isolated bridges for avoiding the resonant response under near-field excitations. Additionally, the deck displacement can be decreased to avoiding the pounding effect at expansion joints and P-delta effect. The anti-lifting device is also installed with the VFPS in parallel to restraint the lift-off of the superstructure. In this poject, the target bridges are 2-D and 3-D bridges with regular columns and irregular columns. Numerical simulation is performed for the bridge with VFPS and anti-lifting device using the nonlinear dynamic time-stepping method. Shaking table testing is conducted to verify the isolation efficiency of the VFPS and the effect of the anti-lifting device. In this study, a simple, robust and highly efficient nonlinear dynamic time-stepping method is developed to analyze the complicated bridge with the VFPS and anti-lifting device which exhibit highly nonlinear behavior. The reasonable design parameters of the bearing system are suggested for practical implementation. It can be anticipated that the new bearing system is an excellent alternative scheme for the design of new bridges, the retrofit of the exiting bridges, and the reconstruction of bridges after earthquake disaster.
