Steel-concrete combined section for large-span double-side box hybrid beam cable-stayed bridge

The invention discloses a steel-concrete combination section for a large-span double-side box hybrid beam cable-stayed bridge. The steel-concrete combination section comprises a steel beam transition section, a combination part and a concrete beam transition section. The steel beam transition section is a section where the main span steel beam extends into the steel-concrete combination section, a plurality of variable cross-section reinforcing stiffening ribs are arranged on a top plate, a bottom plate and a web plate of the steel beam transition section, and the front ends of the variable cross-section reinforcing stiffening ribs are connected with longitudinal stiffening ribs on the top plate, the bottom plate and the web plate of the main span steel beam. The rear ends of the variable cross-section reinforced stiffening ribs are connected with the bearing plate; the joint part is a combined section segment formed by the steel grating chamber and the concrete; the concrete beam transition section is a sect