Lateral Bracing Connections for C-sections Subjected to Bending
Notice bibliographique
Résumé
Fifteenth International Specialty Conference on Cold-Formed Steel Structures St. Louis, Missouri U.S.A., October 19-20, 2000 Lateral Bracing Connections for C-Sectiolls Subjected to Bending B. Beshara! and R. A. LaBoube2 The overall behavior under bending moment of cold-formed steel C-sections assemblies was investigated. Each test assembly consisted of C-sections acting as beams having a track to restrain the ends. Lateral bracing to restrain C-sections from rotation was provided at mid-span. To better understand the influence of the brace connection on the bending behavior, an experimental investigation was carried out with particular emphasis placed on the study of the effect of the midspan brace connection on the bending behavior, and the effect of attaching dry wall to the tension flange. For the dry wall test specimens, lateral bracing was also provided at mid-span. The tested moment capacities are compared to predictions based on the 1996 American Iron and Steel Institutes' Specification/or Design o/Cold-formed Steel Structural Members. Introduction The structural behavior of cold-formed steel C-sections subjected to bending is significantly influenced by the member's bracing condition. The primary emphasis of this study was to investigate the effect of the different bracing connections on the C-section's bending behavior. The light-steel framing industry employs typically three different bracing techniques: a channel passing through the web at the mid-span of the C-section, commonly called a bridge channel; steel straps attached with screws to each flange of the C-section at mid-height of a wall stud; and gypsum wallboard attached to each flange of the C-section. This study concentrated on the bridge channel bracing. The bridge channel may be attached to the stud by either welding the bridge channel to the CSection stud (Fig. 1) or by using a screw-attached clip (Fig. 2). This study focused primarily on the screw-attached clip. An experimental study was performed at the Dietrich Design Group's laboratory in Hammond, Indiana. The study investigated the bending capacity of three C-sections depths (3 5/8, 6 and 8 in.) for different bracing connections using compression flange loading applied at 1/3 points along the beam's span. This loading condition may yield conservative tested moment capacities as compared with the AISI Specification. Additional tests are on going to study the effect of using a uniform load condition applied to the tension flange. The bracing connections investigated used an industry standard clip and the STEEL Network BridgeClipTM (Fig. 3). BOtil screw attached and weld attached connections were tested. The industry clip was prepunched to ensure proper placement of the self-drilling screws. The intent of the test program was to provide a comparison between the behavior of various bracing connections, not to justify the AISI design equations. I Structural Engineer, Dietrich Design Group, Hammond, IN. Formerly M.A.Sc. Student, Department of Civil Engineering, University of Waterloo, Canada 2 Distinguished Teaching Professor, Department of Civil Engineering, University of Missouri-Rolla, Rolla, MO
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|---|---|---|
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