| 摘要 |
PROBLEM TO BE SOLVED: To provide a square steel pipe excellent in cross-sectional efficiency, capable of equalizing or maximally enhancing even a section modulus and the second moment of area in the bending force action direction, while maximally enhancing a local part buckling stress degree of a surface (a compression surface part) of becoming the compression side when receiving bending force, while reducing the cross-sectional area, by specializing as a bending force-receiving member.SOLUTION: In a range of 15.6-200 in the plate thickness ratio of A/t, B/t, a shape of a corner part of the four corners is basically formed in a vertically asymmetric cross-sectional shape, in a mode of becoming larger than the corner length in the lateral direction of the lower side, particularly in the corner length in the lateral direction of an upper side corner part, that is, in a mode of (C>C). |
