Abstract
Abstract A finite strip method of analysis is presented for the inelastic local buckling of I-beams fabricated by welding. Stiffness and stability matrices for the section are developed at a monotonically increasing load factor, and the critical moment is that for which the buckling determinant vanishes. Critical moments determined in this way are shown to agree well with test results. The limiting depth-to-thickness ratios for the web which correspond to compact and semi-compact sections are investigated, and it is shown that the values given in BS 5950: Part I are unconservative for an extensive range of section geometries. Based on a parametric study, alternative and more accurate formulations for the critical web slendernesses are proposed.
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