The invention belongs to the technical field of concrete filled steel tubes, and discloses a full-bolt-connection crossed H-shaped steel reinforced square
steel tube concrete structure and a construction method.The structure comprises a square
steel tube, crossed H-shaped steel used for reinforcement is arranged in the square
steel tube, and the space between the crossed H-shaped steel and an inner cavity of the square steel tube is filled with concrete; the crossed H-shaped steel comprises a plurality of first
steel plates which are attached to the inner wall of the square steel
pipe, the adjacent first
steel plates are fixedly connected with one ends of second
steel plates and third steel plates respectively, the other ends of the second steel plates are fixedly connected with the opposite first steel plates, and the ends, away from the first steel plates, of the third steel plates are fixedly connected with the second steel plates. A fastening
assembly is arranged on the square steel
pipe, and the first steel plate is connected to the inner wall of the square steel
pipe in a bolted mode through the fastening
assembly. According to the method, the local buckling resisting capacity of the square steel tube flat plate is improved, the restraining effect of the steel tube wall on the core concrete is improved, and the strength of the square steel tube concrete under the action of
axial pressure and
bending moment and the
ductility and energy dissipation capacity under the action of earthquake loads can be remarkably enhanced.