New Edition of the North American Specification for the Design of Cold-Formed Steel Structural Members is Published

This edition supersedes all previous issues of the “Harmonized North American Standard”

The American Iron and Steel Institute (AISI), in cooperation with CSA Group, today announced publication of the new edition of the North American Specification for the Design of Cold-Formed Steel Structural Members. This latest edition provides updated information from recent advances in research on cold-formed steel design. It supersedes all previous editions.

The North American Specification harmonizes cold-formed steel design technology across the United States, Canada and Mexico, allowing for faster introduction of new technologies as well as opening up the market for a variety of derivative products such as design aids and educational materials. The Specification includes a main document—Chapters A through G and Appendices 1 and 2—that is intended for use by all three countries. There are two country-specific appendices: Appendix A is for use in the United States and Mexico, and Appendix B is for use in Canada. The Specification provides an integrated treatment of Allowable Strength Design (ASD), Load and Resistance Factor Design (LRFD), and Limit States Design (LSD).

Reflecting ongoing research to develop new and improved information on the structural behavior of cold-formed steel members, the new edition includes the following additions and revisions:

  • Addition of material standard ASTM A1063.
  • Reorganization of all referenced ASTM material standards in accordance with the ranges of the minimum specified elongation.
  • Addition of Section B1.3, Corner Radius-to-Thickness Ratios.
  • Addition of Section B2.5, Uniformly Compressed Elements Restrained by Intermittent Connections.
  • Unification of country-specific provisions on tension member design, which have been moved to the main body of the Specification.
  • Revision of the reduction factor for combined bending and torsional loading.
  • New provisions on combined shear and tension on arc spot welds and top arc seam sidelap welds.
  • Provisions for determining the web shear strength using the Direct Strength Method, which is an alternative approach for determining the strength and stiffness of cold-formed steel beams and members.
  • New design provisions for power-actuated fasteners, which are widely used in building construction.

The North American Specification is the result of a cooperative effort by AISI’s Committee on Specifications for the Design of Cold-Formed Steel Structural Members and the CSA Group Technical Committee on Cold Formed Steel Structural Members.

The new edition is designated as AISI S100-12 in the United States and is available for purchase on AISI’s website at www.steel.org. In Canada, this edition is designated as CSA S136-12 and is available for purchase on the CSA Group’s online store at www.shop.csa.ca. It has been approved in the U.S. by the American National Standards Institute (ANSI) as the American National Standard, developed in Canada by CSA Group, and endorsed in Mexico by Camara Nacional de la Industria del Hierro y del Acero (CANACERO).

About AISI

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, which oversees the industry’s investment in advancing the competitive use of steel by meeting the demands of the marketplace. For more information on SMDI’s Construction Market program, visit www.smdisteel.org.

AISI serves as the voice of the North American steel industry in the public policy arena and advances the case for steel in the marketplace as the preferred material of choice. AISI also plays a lead role in the development and application of new steels and steelmaking technology. AISI is comprised of 24 member companies, including integrated and electric furnace steelmakers, and 124 associate members who are suppliers to or customers of the steel industry.  AISI’s member companies represent over three-quarters of both U.S. and North American steel capacity. For more news about steel and its applications, view AISI’s website at www.steel.org.


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. For more information, visit CANACERO’s website athttp://www.canacero.org.mx.

About CSA Group

CSA Group is an independent, not-for-profit member-based association dedicated to advancing safety, sustainability and social good. We are an internationally-accredited standards development and testing & certification organization. We also provide consumer product evaluation and education & training services. Our broad range of knowledge and expertise includes: industrial equipment, plumbing & construction, electro-medical & healthcare, appliances & gas, alternative energy, lighting and sustainability. The CSA mark appears on billions of products around the world.


Anthony Toderian
Manager, Corporate Affairs
CSA Group
[email protected]


November 13, 2013