薄肉閉断面部材の捩り挙動 : その 1・圧縮-捩り

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This report describes the experimental results of the torsional behaviour of steel tubes subjected to torsion and constant compression. Torsion is applied by rotating the oil spherical pinfixture. The capacity of the fixture is 200t. (max. stroke : 600mm) in compression and 100tm (max. torsional angle : 30°) in torsion. The specimens are annular sections (165.2φ), rolled square box Sections (175×175) and built-up square box sections (200×200). Test results are as follows. (1) Torsional deformation of rolled tubes showed perfectly elastic-plastic behaviour as τ-γ relation of the material of the specimens. (2) Shear flow under torsion was uniform not only in elastic range but also in plastic range. (3) Built-up tubes showed inelastic behaviour below yield load due to the incomplete pnetration of the welds, but reached the plastic load due to strain-hardening phenomenon. (4) The larger was the share of compression over that of torsion, the smaller the deformation capacity (√<(ε/ε_y)^2+(β′/β_p′)^2>) became. Finally, torsional behaviour of closed sections is compared with that of open sections; wide flange shapes (H-125×125×6.5×9).
社団法人日本建築学会の論文
1976-08-30