多項式摩擦單擺支承（polynomial friction pendulum isolator,PFPI），其曲面為六次方多項式的新式變頻滑動隔震支承，利用回復勁度遞減之軟化段減緩結構加速度反應，亦可藉由回復勁度遞增之硬化段降低結構位移反應。過去研究已證實PFPI應用於等高橋墩與不等高橋墩橋梁中，受近域與遠域震波皆發揮良好的隔震效果。 本研究考慮含PFPI之等高與不等高橋梁受水平雙向地震力作用下之反應。並為確保PFPI不會因地震力過大造成支承位移超出曲盤範圍或使支承上下分離，進而產生落橋或是結構物傾倒，設計一抗拉拔裝置，當地震力太大時，依靠抗拉拔裝置避免支承水平分離，並提供拉力使支承能夠返回曲盤。 本研究採用新隱式非線性有限元素動力分析方法 (New Implicit Nonlinear Dynamic finite element method , NINDFEM) 建立有限元素分析模型，並與振動台實驗有良好的擬合。此外，本研究亦比較比較不同橋梁情況下PFPI之效果與抗拉拔裝置作用的情形，針對比較結果，給予設計上的建議。 ;Polynomial friction pendulum isolator (PFPI) , which curve is six power polynomials , is a new kind of variable frequency pendulum isolator. Using the softening section to reduce the acceleration response of the structure , on the other hand , the hardened section reduces the structural displacement response. Research in past has confirmed that when PFPI applied on regular and irregular bridge. Both the near and far seismic waves exert good isolation effects. This study considers the response of regular and irregular bridge containing PFPI under horizontal seismic waves. And in order to ensure that the PFPI will not cause the support displacement to exceed the boundary of the disk due to the excessive seismic waves or separate the support. Then the bridge will fall or the structure will overturn. Design an uplift restraint device. When the seismic force is too large, the uplift restraint device is used to avoid horizontal separation of the support, and provide tensile force to enable the support to return to the curved plate. In this study, the New Implicit Nonlinear Dynamic finite element method (NINDFEM) is used to establish the finite element analysis model, and it fits well with the shaking table experiment. In addition, this study also compares the effect of PFPI and the effect of the uplift restraint device under different bridge conditions, and gives design suggestions based on the comparison results.
