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When a steel angle-section bar is bent about its weak axis, Brazier's flattening deformation should occur with the association of plate instability. When the angle is bent such that the free edges are in compression, torsional buckling is too predominant to keep the integrity. Thus, the interest is focused on the case that the free edges are in tension. In order to solve this problem, theoretical analysis on the basis of variational method and experimental test on thin-walled angle beams were done. It was observed that the waves of plate buckling are generated and developed, which obviously reduces the bending stiffness of the beam. However, the collapse is not governed by the plate buckling, but by either of flattening, ridge-line buckling and load-point crippling. When the collapse is governed by flattening, the moment vs curvature curve deviates significantly from the linear beam theory, but well coincides with the flattenig theory in consideration of the restraint due to limited span of experimental setup.
社団法人日本建築学会の論文
2008-07-30