Research on Dynamic Characteristics of Double-Layer Continuous Plate-Truss Composite Bridge with Three Main Trusses

Aiming at the dynamic characteristics of the plate-truss composite bridge, the effects of the thickness of the deck, the stiffness of the main truss chord, the overall stiffness of the main truss, the stiffness of the longitudinal beam, the stiffness of the transverse beam, and the stiffness of the parallel connection on the lateral stiffness of the structure were studied by the finite element method. The results show that increasing the thickness of the bridge deck is conducive to improving the overall stiffness of the structure, enhancing the overall stiffness of the main truss is conducive to improving the torsional stiffness of the structure, and enhancing the stiffness of the longitudinal beam is conducive to improving the vertical stiffness of the structure.

Keywords:Plate-truss composite bridge; Combined beam; Dynamic characteristics; Bridge deck; Stiffness