Abstract

Bridge seismic isolation technology provides an effective approach to improving the seismic performance of a bridge. An isolation-bearing device, which is widely adapted in bridge structure, has proved to be simple and effective. A three-dimensional finite element model (FEM) of a prestressed concrete long-span continuous girder bridge is established to analyze its dynamic characteristics. High damping rubber bearing isolation is used to reduce bridge structure vibration under seismic excitations. And seismic dynamic responses are analyzed by nonlinear time history method. It is shown that the seismic response of bridges can be decreased significantly by using damping bearings.

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