Cold-formed steel panels often are used as wall sheathing, roof decking or floor decking in steel framed buildings or pre-engineered metal buildings. Diaphragms formed by interconnecting these panels have considerable in-plane shear resistance, and can be utilized as bracing against buckling for individual members of a steel frame. For wall columns the diaphragm may be either directly attached or connected to girts which in turn are connected to the columns. A procedure is presented for the design of I-section beams and columns with diaphragm or diaphragm-girt bracing. The procedure is based on the ultimate load capacity of fully braced members, utilizing a conservative estimate of the shear strength and shear rigidity of the diaphragm. Design examples are included. The utilization of existing wall, floor or roof diaphragms as bracing for individual beams and columns can eliminate the need for other types of bracing, and/or reduce required member sizes. Thus it contributes to economical design.
Civil, Architectural and Environmental Engineering
Wei-Wen Yu Center for Cold-Formed Steel Structures
American Institute of Steel Construction
American Iron and Steel Institute
Report - Technical
Errera, S. J. and Apparao, T. V. S. R., "Design of I-shaped beams and columns with diaphragm bracing" (1974). Center for Cold-Formed Steel Structures Library. Paper 24.