Abstract
In this paper an attempt is made to establish a more accurate slenderness limit for Class 3 cross-section welded I beams made of high strength steel. For this purpose experimental and nonlinear numerical analysis of the local stability was performed. Ten beams with different flange slenderness were tested up to failure load. The influence of other parameters, particularly web slenderness, was analysed using finite element nonlinear numerical analysis. According to the obtained results and method proposed by B. Kato (J. Construct. Steel Res. 17 (1990) 33–94) the analytical expression for demarcation between slender and semicompact I cross-sections taking into account the flange web interaction was derived. Further research work is needed to consider also the influence of the flange to web thickness ratio.
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