Horizontal variable cross-section special-shaped beam of frame structure

The utility model discloses a horizontal variable cross-section special-shaped beam of a frame structure, and belongs to the technical field of structures of buildings. Comprising a supporting column, cross-shaped beams distributed in a cross shape and connected to the outer wall of the supporting column, and expansion heads arranged at the ends of the cross-shaped beams in an extending mode. The cross-shaped beam is an H-shaped steel beam and comprises an upper flange plate, a lower flange plate and a cross-shaped beam web, the horizontal section widths of the upper flange plate and the lower flange plate are gradually reduced from the beam root part to the beam end part, and expanded heads are arranged at the end parts of the upper flange plate and the lower flange plate; two expanded head webs which are vertically connected between the upper flange plate and the lower flange plate are arranged in the expanded head; and the two expanded head webs and the cross beam web form a Y-shaped structure. In the stru