Bending and Shear Behavior of Web Elements with Openings


Cold-formed steel C-sections are frequently used as wall studs and floor joists in both commercial and residential construction. To facilitate installation of ancillary systems such as electrical wiring and plumbing, the C-section is manufactured with a web opening. Although the opening offers construction advantages, it may degrade the structural integrity of the member. To quantify the degrading effect of a web opening, a study has been conducted at the University of Missouri-Rolla (UMR). The UMR study included the loading conditions of bending, shear, web crippling and the combinations thereof. This paper summarizes the results of an experimental study of the behavior of combined bending and shear. A total of 68 beam specimens, having varying magnitudes of bending moment and shear force have been tested. Based on the findings of this study, it is concluded that the interaction equation employed by the AISI Specification will provide an adequate strength prediction, provided that the individual shear capacity is modified to account for the influence of the web opening. The bending capacity must recognize the strength at the section being evaluated.


Civil, Architectural and Environmental Engineering

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Article - Conference proceedings

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Publication Date

01 Dec 1994

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