Retracted: Study on Dynamic Characteristics of Steel Plate Composite Beams with Unsupported Crossbeam System

Based on the refined seismic finite element model of non-supporting beam composite steel plate composite girder bridges, the important components and design of shear nails and their relative shear stiffness between steel shear beams, steel beams, steel girders and concrete bridge decks are studied. The influence of the parameters on the dynamic characteristics of the composite beam bridge with unsupported beam system shows that the reduction of shear stiffness and the variation of the rigidity of the steel beam have a significant effect on the dynamic analysis of bridge structures, but the change of stiffness of steel beam has little effect on dynamic characteristics of structure, The dynamic characteristics of the steel plate composite beam obtained by the unsupported beam system are significantly sensitive to the design parameters, which provides a basis for the seismic design of the bridge.