Time-History Analysis of a Steel Pipe Concrete Arch Bridge

With the application of the composition material-concrete-filled-steel tube(CFST) in civil engineering,the crossing ability of arch bridge get advanced development.For long-span and small width-span ratio arch bridge,this paper studies the dynamic characteristics and seismic response of a CFST arch-bridge,which main span is 180 meters,width-span ratio is 1/25.7,also studies the dynamic characteristics of main arch ring and bridge earthquake time-history response.The results indicate that the bridge responses are more violent for long-periodic seismic wave because the width-span ratio is less than 1/20,and the bridge static criterion strength .dynamic strength is fit to code's standard.