Seismic Response Analysis Of Curved Multi-Span Truss Bridge Of Concrete Filled Stell Tube

Curved multi-span truss bridges of concrete filled steel tube are relatively new forms of bridge structure.So far,the analysis of the earthquake response of this structure is not sufficient.A lot of bridges are destroyed during the violent earthquakes.Because of the long time of the reparation,the damage of the bridge directly cause economic losses and greatly affecte earthquake relief work and the production resumption.In this thesis,the study achievements at home and abroad are the basis. Ya Lu highway Ganhaizi Bridge is the engineering background.The seismic responses of curved multi-span truss bridges of CFST are studied as follows:1、Analysis approachs of seismic response are studied.Several analysis methods used to calculate the earthquake response of bridges,such as the elastic static approach,the response spectrum approach,the time-history approach,random vibration approach,are introduced and discussed.2、Based on the existing dynamics theories,the corresponding dynamics equations were used to describe the bridges’dynamic actions and appropriate method was chosen to solve these problems on the basis of literature research results.3、Several finite element analysis models of the first joint of Ganhaizi Bridge are established because of the high damping rubber bearing of special structure.4、The seismic responses of the first joint of Ganhaizi Bridge are analyzed using the response spectrum spectrum approach and the time-history approach.Internal forces and displacements of structural crucial sections were compared.5、The seismic responses of the high damping rubber bearings of special structure at different earthquake situations are analyzed and studied.