There have been twenty-five years of development of base isolators for bridges since 1970's. The sliding isolation includes the pure friction system, Electric de France system and resilient-friction base isolator (RFBI). The friction pendulumsystem (FPS) presented in this paper is similar, but more advanced than RFIII isolator. A finite element formulation, including the local bending effect for the FPS isolator has been adopted. The formulation provides a powerful tool for simulating theseismic behavior of the FPS isolator and the structures that are installed with FPS-isolators. It is concluded from the numerical study that the seismic resistance of bridges can be enhanced through installation of the FPS isolators.
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