Dynamic Behavior And Seismic Response Analysis Of Long Span CFST Arch Bridge

With the increasing of the number,the span of concrete filled steel tubular arch bridge,and the appearance of the bridge become more and more light,the dynamic characteristics and seismic performance of CFST arch bridge become more and more important.In particular,China is in the earthquake prone zone,a bridge could be damaged or even collapsed when an earthquake happens,which is a serious impact on the rescue work and people's lives.Therefore,it is necessary to study the dynamic characteristics and seismic behavior of long span concrete filled steel tubular arch bridge.In this paper,based on a long span concrete filled steel tubular arch bridge,the dynamic characteristics and seismic response of the bridge are analyzed by using the finite element software SAP2000,the main contents are as follows:1.Analyzing the research status of dynamic characteristics and the seismic response of the bridge structure,aiming at the characteristics of long span CFST arch bridge,discussing the characteristics and applicability of the present seismic response analysis method,the analysis method and content of this paper were clarified.2.Based on the finite element model,the natural frequency,mode and period of the bridge were calculated,and the influence of the boom beam,the arrangement of the transverse brace and the stiffness of the arch rib on the dynamic characteristics of the bridge were analyzed.3.By using the El-Centro,Taft and TAR-TARZANA earthquake wave and two incentive mode in the time-history method,the force and displacement of the bridge were obtained,and then the seismic response under different conditions were compared,in order to figure out the final result of seismic response analysis by using time-history method.4.By using the Clough-Penzien and the Ou Jinping-Niu Ditao power spectral density function on the analysis of stochastic seismic analysis,the seismic response results were compared with the results of time history analysis,and the difference of time-history method and stochastic method were discussed.At last,an evaluation of the stochastic seismic analysis method was put forward.