Square steel tube for column beam connection, beam column joint structure using the same, and method of manufacturing square steel tube

摘要

In the square steel tube for the beam column joint of square steel tubular column and steel beam, the radius of curvature of the corner is reduced while securing the thickness that can be used for the connection with steel beam, and the generation of warp in the flat part of the cross section of the square steel pipe is suppressed.The side length L and the thickness t of the flat portion of the four sides of the cross section perpendicular to the tube axis of the square steel tube satisfy the relationship of L / t.ltoreq. 10.5, and the curvature radius C of one of four corners of the cross section satisfies the relationship of C / t.ltoreq. 0.8 relative to the thickness t of the flat portion.