Steel-concrete joint section structure of beams

The invention discloses a steel-concrete joint section structure of beams, which comprises a steel beam, a concrete beam and a bearing plate, wherein the steel beam is sheathed outside the concrete beam, thereby forming a transition section from the concrete beam to the steel beam; the steel beam web in the transition section is inserted into the concrete beam web to form a steel-concrete composite section; an upper and lower closed compartments are arranged in the transition section; the bearing plate is a steel plate of which the cross section being exactly matched with that of the steel beam; each contact site of the steel beam and the concrete beam in the transition section is provided with a shearing force toggle pin; the steel beam top plate and the steel beam bottom plate are respectively provided with a U-shaped ribbed stiffener; each U-shaped ribbed stiffener is welded with an pi-shaped ribbed stiffener; and the height of the pi-shaped ribbed stiffeners gradually increases from the steel beam side to the concrete beam side. The steel-concrete joint section of beams can be widely used in various composite beam bridges, such as continuous bridges, stayed-cable bridges, suspension bridges and arch bridges, and can solve the problems of complex process and manufacture, difficult construction operation and low fatigue resistance at the steel-concrete joint section.