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Cold-Formed Steel Framing Design Guide, Second Edition

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Cold-Formed Steel Framing Design Guide, Second Edition Missouri University of Science and Technology Scholars' Mine AISI-Specifications for the Design of Cold- Wei-Wen Yu Center for Cold-Formed Steel Formed Steel Structural Members Structures 01 Oct 2007 Cold-Formed Steel Framing Design Guide, Second Edition American Iron and Steel Institute Follow this and additional works at: https://scholarsmine.mst.edu/ccfss-aisi-spec Part of the Structural Engineering Commons Recommended Citation American Iron and Steel Institute, "Cold-Formed Steel Framing Design Guide, Second Edition" (2007). AISI- Specifications for the Design of Cold-Formed Steel Structural Members. 160. https://scholarsmine.mst.edu/ccfss-aisi-spec/160 This Technical Report is brought to you for free and open access by Scholars' Mine. It has been accepted for inclusion in AISI-Specifications for the Design of Cold-Formed Steel Structural Members by an authorized administrator of Scholars' Mine. This work is protected by U. S. Copyright Law. Unauthorized use including reproduction for redistribution requires the permission of the copyright holder. For more information, please contact [email protected]. Cold-Formed Steel Framing Design Guide Second Edition October 2007 Design Guide D110-07 Committee on Specifications for the Design of Cold-Formed Steel Structural Members American Iron and Steel Institute 1140 Connecticut Avenue NW Washington, DC 20036 This Design Guide has been developed under the direction of the American Iron and Steel Institute Committee on Specifications for the Design of Cold-Formed Steel Structural Members. The development of the Guide was sponsored by the American Iron and Steel Institute and the Steel Stud Manufacturers Association. The AISI Committee on Specifications wishes to acknowledge and express gratitude to Mr. Thomas Trestain of T. W. J. Trestain Structural Engineering who was the author of this Guide. With anticipated improvements in understanding of the behavior of cold-formed steel and the continuing development of new technology, this material might become dated. It is possible that AISI will attempt to produce updates of this Guide, but it is not guaranteed. The publication of the material contained herein is not intended as a representation or warranty on the part of the American Iron and Steel Institute, or of any other person named herein. The materials set forth herein are for general information only. They are not a substitute for competent professional advice. Application of this information to a specific project should be reviewed by a registered professional engineer. Anyone making use of the information set forth herein does so at their own risk and assumes any and all resulting liability arising therefrom. 1st Printing – November 2007 Produced by American Iron and Steel Institute Copyright American Iron and Steel Institute 2007 AISI Cold-Formed Steel Framing Design Guide, Second Edition Cold-Formed Steel Framing Design Guide Preface This publication is intended as a guide for designers of cold-formed steel framing (CFSF) systems for buildings. CFSF products include cold-formed studs, joists, rafters, trusses and miscellaneous bracing and connection components. They may be stick built on site as individual members or panelized into pre-assembled systems for walls, floors or roofs. The material presented in this publication has been prepared for the general information of the reader. While the material is believed to be technically correct and in accordance with recognized good practice at the time of publication, it should not be used without first securing competent advice with respect to its suitability for any given application. Neither the American Iron and Steel Institute, its Members nor T.W.J. Trestain Structural Engineering warrant or assume liability for the suitability of the material for any general or particular use. Scope and Purpose of the Guide This guide has been prepared to assist practicing structural engineers to design cold- formed steel framing (CFSF) systems. This is the second edition of the Guide – the first was published January 2002 (AISI 2002a). A general review of the basic structural principles is provided along with a number of detailed design examples covering wind bearing and axial load bearing stud walls and joists. The design examples are based on the 2001 North American Specification for the Design of Cold Formed Steel Structural Members (AISI 2001a) and the Supplement 2004 to the North American Specification (AISI 2004). Reference is also made to ASCE 7-05 (ASCE 2005) and the 2006 International Building Code (IBC 2006). The examples show how to translate the information available in load tables into complete structural systems. Both screwed and welded connection details are included with an emphasis on screwed. Useful information on the strength of commonly used concrete anchors and self-drilling screws is also included. A number of methodologies are proposed to handle design problems not covered in the AISI Specification. These include a rational method to check the warping torsional stresses in channel members, an approximate method to check the bearing stresses under the bottom track of axial load bearing stud wall assemblies and a method to check the strength and stiffness of inner and outer top track assemblies for wind bearing applications. Page i AISI Cold-Formed Steel Framing Design Guide, Second Edition A universal designator system for Cold-Formed Steel Framing (CFSF) members has been used throughout the Guide. This product identification method is described in Appendix I. Changes from the 1st Edition of the Design Guide The first edition of the Design Guide (AISI 2002a) has been completely rewritten to reflect improvements in the design of CFSF members and connections. • The load combination factors as required by ASCE 2005 have been used including a 0.7 factor on wind for deflection calculations from IBC 2006. • The design examples have been revised to conform to the latest design standards including the AISI Specification (AISI 2001a) and the AISI Supplement (AISI 2004). In addition, AISI/COFS standards have been used where applicable (COFS 2004a, 2004b and 2004c). • Powder actuated fasteners have been added to the examples. • A single outer top track deflection detail has been added. • A slide clip detail for connecting wind bearing jamb studs has been added. • A design methodology for flat strap blocking-in has been provided. • Design Example #2 has been expanded to include both welded and screwed connections. • The design method for checking cantilevering stud deflections has been expanded. • An alternative parapet design using cantilevering HSS posts has been added. • The connection details in Design Example #4 have been converted from welded to screwed to reflect the more common practice. • A jack stud has been added to the built-up jamb detail in Design Example #4. Load Tables In the first edition of the Guide, the generic load tables prepared by the Steel Stud Manufacturers Association (SSMA) were used as the source for section properties and floor and wall load capacities. Generic tables based on the latest codes and standards (AISI 2001a, AISI 2004, ASCE 2005 and IBC 2006) were not available during preparation of this second edition and the output from industry standard software, AISIWIN1 (Devco 2006), has been used instead. Thus in the design examples where reference is made to "load tables" or "manufacturer's tables", it is actually AISIWIN output that has been used. Note that the AISIWIN output is to the 2001 AISI Specification (AISI 2001a) including the 2004 Supplement (AISI 2004). 1 AISIWIN is an industry standard steel stud and joist software package prepared by Devco Software Inc. Page ii AISI Cold-Formed Steel Framing Design Guide, Second Edition Other Sources of Information There are a number of other valuable resource documents for the design of cold-formed steel structures. These are either referenced in the Design Guide or are available at the following websites: • American Iron and Steel Institute (AISI) – www.steel.org • Association of the Wall and Ceiling Industries – www.awci.org • Center for Cold-Formed Steel Structures (CCFSS) – www.umr.edu/~ccfss • Cold-Formed Steel Engineers Institute (CFSEI) – www.cfsei.org • Steel Framing Alliance (SFA) – www.steelframing.org • Steel Stud Manufacturers Association (SSMA) – www.ssma.com Acknowledgements The American Iron and Steel Institute and the Steel Stud Manufacturers Association would like to acknowledge the contribution of Mr. Tom Trestain, P. Eng. of T.W.J. Trestain Structural Engineering, Toronto, Canada who was retained for the preparation of this publication. Mr. Trestain is experienced in the design and installation of CFSF products and is an active member on the AISI Committee on Specifications and the AISI Committee on Framing Standards as well as other voluntary industry committees. The development of this Guide has been greatly assisted by the Dietrich Design Group Inc. who volunteered the CAD linework for the drawings. A number of individual engineers have also added their expertise to this project. Rob Madsen at Devco Engineering provided many helpful interpretations of industry practice on the West Coast. In addition, he authored the AISIWIN software package that was used during the preparation of the Guide and provided any needed technical support. Ed DiGirolamo and Nabil Rahman of the Steel Network and John Matsen of Matsen Ford Design Associates were also very helpful regarding practices in the East. In Canada, Scot McCavour at McCavour
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