Web crippling of high strength cold-formed steel beams
"The structural behavior of high strength cold-formed steel beams subjected primarily to web crippling was investigated analytically and experimentally. In this study hat sections and I-beams, formed from five different types of high strength sheet steels commonly used in the automobile industry, were investigated under various loading conditions. The yield strengths of these sheet steels vary from 58 to 165 ksi. In addition to the test data gathered in this phase of study, the experimental results obtained from the beam tests conducted at Inland Steel Company and Ford Motor Company were carefully evaluated. The evaluation indicated that the present available design criteria are not suitable for high strength materials with yield strengths exceeding 80 ksi. Following the analytical and experimental studies, new design formulas were derived for different types of loading conditions on the basis of available test data with material yield strengths ranging from 30 to 165 ksi. These empirical equations distinguish between web crippling failure caused by overstressing (bearing failure) and web buckling. Interaction formulas were derived for sections with single unreinforced webs and I-beams under combined web crippling and bending moment. Additional tests were also performed for the transition ranges between the basic loading conditions. These test data were used to verify the newly proposed design equations which can eliminate the problem of discontinuity between different basic loading conditions "--Abstract, page ii.
Missouri University of Science and Technology
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