Variable cross-section beam structure

A variable cross-section beam structure comprises a main beam, the main beam is a C-shaped beam with an opening in one side, a cross-section reinforcing plate is fixedly arranged at the position, bearing large bending moment, of the main beam, the cross-section reinforcing plate is embedded and fixed to the inner side of the opening of the main beam, and the upper side and the lower side of the cross-section reinforcing plate abut against the upper inner wall and the lower inner wall of the opening of the main beam for supporting. The section reinforcing plate is a C-shaped beam with an opening in one side, the upper side of an upper plate of the section reinforcing plate abuts against the lower side of an upper plate of the main beam, and the lower side of a lower plate of the section reinforcing plate abuts against the upper side of a lower plate of the main beam. The reinforcing plate is arranged at the dangerous section of the beam, section coefficient of the beam is increased, stress of each position of