Abstract
The failure mechanism of slender girder webs stiffened by a single longitudinal stiffener under patch loading is addressed. Experimental results have shown that failure is due to crippling in the web panel formed between the loaded flange and the stiffener. This mechanism is similar to the one for unstiffened webs, which is characterized by the presence of elastoplastic deformations in the compression flange (plastic hinges) and in the web (yield lines). A longitudinal stiffener with normal position, b 1 <0.3 h w , and rigidity restricts the size of the buckle in the upper web panel, and in some cases the distance between the outermost plastic hinges in the loaded flange is reduced. Based on the upper bound theorem of plastic collapse an expression for the patch loading resistance of webs stiffened by a single horizontal stiffener is presented. Theoretical predictions are in good agreement with experimental results.
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