The 20th and 21st joint COTA International Conference of Transportation Professionals (CICTP 2020-21)

The concrete filled steel tube tied arch bridge combines deck system and arch rib into a whole to bear the load through suspender. Different suspender layout forms have great influence on the mechanical properties of tied arch. Therefore, a 96 m span concrete-filled steel tubular tied arch is taken as the engineering background, and three different suspender layout forms (vertical suspender, Nielsen suspender and mesh suspender) are created by using finite element software, and the internal force law and influencing factors of static and dynamic aspects of bridge structure are studied. The results show that both Nielsen suspender and reticular suspender can improve the vertical stiffness and natural frequency of the structure, and reduce the vertical deflection of the structure and the live load bending moment of the arch rib and tie Girder. The results of this paper can provide reference for the design of CFST Tied Arch Bridge.