Abstract
In steel building structures, the plastic rotation capacity of H-shaped beam welded to the column is affected by failure mode. When width-to-thickness ratio of beam flange (bit) is large, local buckling of the beam flange governs the rotation capacity of the beam. On the other hand, when stocky beam section is used, fracture of the beam flange or weld at the stress concentra tion point of the beam end may occur. In this case, premature fracture of the beam flange or weld may occur before the local buckling of the beam flange, when the ductility and the toughness of the beam flange material is poor. In this study, two series of tests were carried out to investigate the boundary between the local buckling and the fracture of the beam flange.
