Abstract
Strength and rotation capacity of steel members is much affected by the local collapse of plate elements. Therefore, many reports have been reported and they have dealt with the initiation of local buckling. But in most cases the deformation of the members can develop without any decrease in strength. These phenomena may be attributed to the post yielding property of the material especially strain-hardening property. In this paper, the post buckling characteristics of plate elements are analysed and comparison with test data is made. In this series of tests. twelve beams, made of SS 41, SM 50 and YES 40, whose flanges' width-thickness ratio is between six and twenty, are tested under pure bending. We have got good agreement of experimental results with theroretical ones.
