Abstract
A theoretical analysis is performed on the post local buckling behavior of wide-flange beam-columns shown in Fig. 1(a). The analysis mainly based on the technique used in Ref. 10). However, the present analysis takes into account effects of plastic elongation in a local plastic hinge forming in the plate element, and effects of axial stresses in the plate element on specific power of dissipation of the local plastic hinge. The basic equation [Eq. (2)] is given by the principle of virtual velocities and principle of maximum specific power of dissipation. Among the Moment-Rotation curves based on the Eq. (2), the lowest result is valid, because of this analysis being based on the upper bound theorem. The analytical results are first compared with the test results shown in Ref 9). The second the effects of plastic elongation in the local plastic hinge and of axial stresses on a specific power of dissipatiou of the local plastic hinge are discussed. The results may be summarized as follows : 1. The experimental Moment-Rotation curves are well predicted by the analysis for the specimen with slender plates. 2. The Moment-Rotation curves under no consideration of the effects of plastic elongation in the local plastic hinge and of axial stresses in the plate element are lower in load carrying capacity than ones under the consideration of those effects.
