Abstract
In wide-flange steel shapes, concentrated flange force possibly causes the local failure originated from local web yielding, local flange bending and so on. This paper presents new formulae of local web yielding strength. The yield line theory is applied to obtain the strength considering the collapse mechanism where the yield lines form in the flange and the yield fields, in the web and flange. The proposed formulae include the sizes of the flange width and thickness which are not considered in the formula generally used in practice. The test results of the plate-to-wide-flange steel connections show good agreement with the results of strength estimation. The measured residual flange deformation confirms the validity of the collapse mechanism considered.
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