Abstract
When a thin-walled plate girder is subjected to repeated bending, it is possible that fatigue cracks may be initiated at the toe on the web side of fillet welds connecting the compression flange to the web. They are caused by the secondary bending stress produced by out-of-plane movement of the web under repeated in-plane bending, due to its unavoidable initial deflection. In this paper, first, the relation between in-plane bending stress and secondary bending stress is formulated. Secondly, substituting the fatigue strength of fillet welds subjected to secondary bending stress into the relation, the fatigue strength for the above fatigue cracks is expressed in in-plane bending stress. It is given as a function of the web slenderness ratio, and the influence of various factors on the fatigue strength is discussed.
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