This research is concerned with the experimental study on seismic behavior of bridges with rolling type seismic isolation bearings. Unlike base isolation of buildings, bridge columns play an important role on the seismic behavior of the bridges. The columns not only provide the vertical support, but also contribute lateral stiffness and inertia force under earthquake ground motions. The effective period of the isolated bridge becomes longer and effective damping ratio becomes smaller due to the stiffness of the columns. A 1/7.5 scaled bridge model is designed and constructed in this study. A series of experiments are to be carried out at NCREE to verify various types of bearings. This paper summarized the design of the bridge model and some preliminary test results of the shaking table study with Rolling Type Seismic Isolation Bearings [RTB].
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