Direct strength method for web crippling of lipped channel sections with flanges restrained under ETF and ITF loadings
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Date
2020-10-20
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Abstract
Web crippling is a prominent failure mode of cold-formed thin-walled steel members. In this study, a direct strength method (DSM) is investigated for the web crippling calculation of lipped channel sections with flanges restrained under the end-two-flange and interior-two-flange loading conditions. First, numerical models are utilised to obtain the elastic buckling critical load and plastic failure mechanism. Then, through correction, the elastic buckling critical load formula is established based on the elastic plate stability theory analysis. The plastic load formula is then deduced by assuming a
yield-line mode under the limit state and using the virtual work principle. Based on parameter studies, the undetermined coefficients of the DSM are calculated. Finally, existing test results are compared with those of the proposed formula and AISI S100-16 calculation values, and the proposed formula achieves better results, highlighting its potential to provide reference values for engineering applications.