Study on Impact Coefficient of Under-supported CFST Arch Bridge

With the method of finite elements software-ANSYS and the characteristics of under-supported CFST arch bridge,this thesis studies the Binjiang Bridge in Taixing which is an under-supported CFST arch bridge.This thesis simulate the components of CFST arch rib(internal concrete and external steel tube),ties and beams with beam element beam4;the boom with tube unit link8;the bridge deck pavement with shell element shell63;the fabricated hollow slab of the bridge deck with solid45;thus,sets up the finite element model of the spatial computation of the bridge,and then obtains the each order vibration frequency and vibration model data.The axle coupling vibration model of the arch bridge is constructed under the action of a quarter vehicle model.MATLAB programming is employed to analyze dynamic response of under-supported CFST arch bridge under the mobile load condition.Consequently,vibration response of mechanics performances is obtained under different speed,lane,damping and road condition.The conclusions and relevant research results provide reference for impact coefficient during the design,the researches of vehicles impact coefficient and load effect analysis of the later maintenance of the long-span CFST arch bridge.