Steel plate composite beam pre-camber setting method and steel plate composite beam

The invention discloses a steel plate composite beam pre-camber setting method and a steel plate composite beam, and relates to the technical field of bridge pre-camber. The method comprises the steps that a first-stage load in the steel plate composite beam construction process is applied to an initial finite element model, and a middle fulcrum cross beam deformation curve of the steel plate composite beam is obtained; adjusting parameters of a middle fulcrum cross beam of the initial finite element model to enable the deformation of the middle fulcrum cross beam to be zero after the first-stage load is applied, and obtaining an updated finite element model; a second-stage load in the steel plate composite beam construction process is applied to the updated finite element model, and longitudinal beam deformation curves of the steel plate composite beam are obtained; and determining the pre-camber of the middle fulcrum cross beam according to the deformation curve of the middle fulcrum cross beam, and obtaini