Research on Mechanical Performance of Concrete-Filled Steel Tube Tied Arch Bridge under Different Suspender Arrangements

The concrete-filled steel tube (CFST) 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 arches. Therefore, a 96m 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. Then the internal force law and influencing factors of static and dynamic aspects of bridge structures 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 Bridges.