Described in this paper is the application of a finite element model to a cold-formed steel C-section with a bearing stiffener installed between its flanges. This model has been used to determine both the web crippling capacity of the joist, and the forces that develop in the fasteners connecting the bearing stiffener to the joist. The finite element model was also used to carry out parametric studies of the stiffened joist assembly to determine the impact on the web crippling capacity and the fastener forces caused by variations in the assembly. Based on the results of these finite element studies, combined with available experimental work, a design expression has been proposed that can calculate the web crippling capacity of a cold formed steel C-section joist that has a bearing stiffener installed between the joist flanges. A second design expression has been proposed for predicting the forces in the fasteners that connect the joist to the stiffener. Predictions of both the web crippling capacity and the fastener forces are necessary for determining the ultimate strength of the stiffened joist assembly.
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