| 摘要 |
<p>[Problem] To ensure mechanical stability in a web and a flange that constitute a cross section in a thin-plate structural member subjected to shear bending, to maintain flexural strength after the yielding of the flange, and to improve the plastic deformation capacity of the member. [Solution] In a groove-shaped cross-sectional member and an H-shaped cross-sectional member, a rectangular cross-sectional member (4) or an L-shaped cross-sectional member (5) is disposed in parallel with upper and lower flanges (2, 3) on one or both side surfaces of a web (1), one end of the member cross-section is spliced with the web and the other end is spliced with the flange, and triangular or quadrilateral tube-shaped bodies are provided at cross-sectional corners. As illustrated in the schematic diagram, a torsional strength MＴ necessary for mechanical balance as a structural member can be supplemented by the large torsional strengths MT1，MT2 of closed cross-sections, which are the product of the distance between the shear stress indicated by the solid arrows and the center of stress flow. This makes it possible to impart an excellent mechanical property whereby localized buckling deformation is suppressed in the cross-sectional plate element, bending torsional buckling is prevented in the entire member, and strength is maintained up to the yield point load and after the yield even in a structural member constituted by a thin plate.</p> |
