October 6, 2010
AISI And CSA Standards Announce Supplement No. 2 To The North American Specification For The Design Of Cold-Formed Steel Structural Members

WASHINGTON, D.C.  – The American Iron and Steel Institute (AISI), in cooperation with the CSA Standards, announced today that Supplement No. 2 to AISI S100 (CSA S136), the North American Specification for the Design of Cold-Formed Steel Structural Members, 2007 Edition (S100-07/S2-10), has been published and is available free of charge on AISI’s website at  and through CSA Standards at (Shipping and handling charges may apply in some cases).

The new Supplement includes all updates provided in Supplement No. 1 to the North American Specification for the Design of Cold-Formed Steel Structural Members, 2007 Edition. It also includes the following changes and updates:

  • New design provisions offered in Section B2.5, Uniformly Compressed Elements Restrained by Intermittent Connections.
  • Unified provisions in Section C2, Tension Members, which was moved from country-specific Appendices A and B to the main body of the Specification.
  • Revised Sections D1.1, D1.2, D3 and D3.2 to clarify certain terminologies.
  • A complete Chapter E, Connections and Joints, which includes:
    • Revised flare groove weld provisions,
    • The addition of interaction check of combined shear and tension of arc spot welds, and
    • Unified shear rupture checks.
  • The modification of Section F1.1, Load and Resistance Factor Design and Limit States Design, to differentiate the composite interior partition wall studs from direct load-bearing systems.
  • An expansion of the geometric and material limitations of pre-qualified columns and beams for using the Direct Strength Method.

“Supplement No. 2 is an important revision of the North American Specification for the Design of Cold-Formed Steel Structural Members, 2007 Edition,” Jay Larson, P.E., F.ASCE, Managing Director, AISI Construction Technical Program, said. “The timely completion of this document will make it available for adoption by the 2012 editions of the International Building Code.”

AISI S100-07 (CSA S136) has been adopted in the U.S. by the American National Standards Institute (ANSI) as an American National Standard; in Canada, approved by the Standards Council of Canada (SCC) as a National Standard of Canada; and endorsed by Camara Nacional de la Industria del Hierro y del Acero (CANACERO) in Mexico.

“The technical changes in Supplement No. 2 will greatly help the industry in advancing cold formed steel in the Canadian marketplace,” says Michael Mortimer, P-Eng, Program Manager, Built Environment, CSA Standards.   “The Supplement includes essential information for structural designers to assist them in the design of more efficient and economical cold formed steel structures.“

AISI’s codes and standards work is conducted under the Construction Market Council of the Steel Market Development Institute (SMDI), a business unit of AISI. The SMDI oversees the industry’s investment in advancing the case for steel in the marketplace as the preferred material of choice.

AISI serves as the voice of the North American steel industry in the public policy arena and plays a lead role in the development and application of new steels and steelmaking technology. AISI is comprised of 23 member companies, including integrated and electric furnace steelmakers, and 138 associate and affiliate members who are suppliers to or customers of the steel industry. AISI's member companies represent approximately 75 percent of both U.S. and North American steel capacity. For more news about steel and its applications, visit AISI’s website at

CSA Standards is a leading standards-based solutions organization serving industry, government, consumers and other interested parties in North America and the global marketplace. Focusing on standards and codes development, application products, training, advisory and personnel certification services, the organization aims to enhance public safety, improve quality of life, preserve the environment and facilitate trade. CSA Standards is a division of CSA Group, also consisting of CSA International, which provides testing and certification services for electrical, mechanical, plumbing, gas and a variety of other products; and OnSpeX, a provider of consumer product evaluation, inspection and advisory services for retailers and manufacturers. For more information, visit

CANACERO is an association of Mexican steel-producing and fabricating companies. The association has programs to assist its members in a wide variety of areas and is a central source of information for steel industry partners, suppliers and clients.

Source: American Iron and Steel Institute, September 22, 2010

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