Study On The Siesmic Response Analysis Of Isolated Bridges

Recently，continuous girder bridge is widely used in practical engineering becauseof its rationaly load-carrying and its convenient construction. Bridge engineering playsan important role in the lifeline engineering, making the seismic design of continuousgirder Bridges also become a hotspot in research. To set up a bridge isolation device is awidely used method in seismic design of Bridges. The isolation bearing are commonconsidering ways of reducing isolation in engineering design on account of itsconstruction is convenient.In this paper, author did the following works to study the response of the base-isolated continuous girder Bridges under seismic action:①On the basis of summarizing the existing continuous girder bridge seismicresearch, author used Perform-3D to analyse the bridge without seismic isolation witchpier is set up by fiber element,and analysis of the bridge using the dynamic time historyanalysis method.②Using the time history method, calculated the seismic response of the isolatedbridge witch is isolated by the Lead Rubber Bearing or Friction Pendulum System,andconsidered the nonlinearity of piers.In order to research the difference of the fiber element between different soft-ware.Adopting fiber element model,analyzed single pier by using Perform-3D andMIDAS/Civil respectively,then comparinged the analysis result.