Seismic Design of Long-Span Single-Track Continuous Concrete Girder Bridge in Railway at High Seismic Intensity Area

Xuhong River Bridge on Suzhou-Huaiyin Railway is located in high seismic intensity area,with a long-span single-track continuous prestressed concrete girder to cross above the flood control dyke and the channel of the Xuhong River.This paper,takes the seismic design of main bridge of Xuhong River Bridge as the example to introduce the design idea and design methods of bridge seismic design.This paper also discusses how to use the seismic concept design to obtain the structure system and seismic system which are suitable to the characteristics of this project.Combined with the seismic response analysis on the bridge,the design of bridge structure and anti-seismic measures are guided,eventually the objectives of seismic design are achieved.Through the analysis and contrast of multiple seismic systems,the seismic isolation design scheme of the FPS bearing connecting with viscous damper in parallel is selected finally.Remarkable superiorities of the seismic isolation scheme in technology and economy are showed compared with traditional seismic design methods.