PREFACE
The American Iron and Steel Institute Committee on Framing Standards has developed AISI
S213, the North American Standard for Cold-Formed Steel Framing ¡V Lateral Design, to address the
design of lateral force resisting systems to resist wind and seismic forces in a wide range of
buildings constructed with cold-formed steel framing. This standard is intended for adoption
and use in the United States, Canada and Mexico.
This standard provides an integrated treatment of Allowable Strength Design (ASD), Load
and Resistance Factor Design (LRFD), and Limit States Design (LSD). This is accomplished by
including the appropriate resistance factors (ƒÖ) for use with LRFD and LSD, and the appropriate
factors of safety (Ă) for use with ASD. It should be noted that LSD is limited to Canada and
LRFD and ASD are limited to Mexico and the United States.
Changes made in Supplement No. 1 to the 2007 Edition include the following:
- Rd values in Table A4-1 for diagonal strap braced (concentric) walls were adjusted to match
the values approved by the Canadian National Committee on Earthquake Engineering
(CANCEE) for inclusion in the National Building Code of Canada (NBCC) seismic
provisions.
- Language in C1.1 was modified to clarify when design must comply with the special seismic
requirements.
- The existing provisions on setbacks in Section C2, which the Committee thought should be
limited to prescriptive methods with defined limits of applicability, were replaced with a
requirement deemed to be more appropriate for a design standard.
- Adjustments were made to Table C2.1-3 for 0.027¡¨ steel sheet, one side, based on testing at
the University of North Texas (Yu, 2007). Designation thickness for stud, track and blocking
associated with the existing tabulated values was increased from 33 mils (min.) to 43 mils
(min.). New values were added for designation thickness for stud, track and blocking equal
to 33 mils (min.).
- Equation C2.1-1 for determining the design deflection of a blocked wood structural panel or
sheet steel shear wall was consolidated for US Customary and SI units.
- The word ¡§countersunk¡¨ was deleted and commentary added to clarify provisions for
tapping screws to attach wood structural panel sheathing in Section C2.2.2.
- Language in C3.3.2 was modified to clarify when the uplift anchorage and boundary chords
must comply with the special seismic requirements.
- The design provisions of Section C5.3, Seismic Forces Contributed by Masonry and Concrete
Walls, and Section C5.4, Seismic Forces from Other Concrete or Masonry Construction, were
relocated under Section C1, General.
- A definition for amplified seismic load was added under Section A2, Definitions.
- Equation D2.1-1 for determining the design deflection of a blocked wood structural panel
diaphragm was consolidated for US Customary and SI units.
The report referenced above, Steel Sheet Sheathing Options for Cold-Formed Steel Framed Shear
Wall Assemblies Providing Shear Resistance (Yu, 2007), is available as a free download from the
American Iron and Steel Institute (www.steel.org) and Steel Framing Alliance
(www.steelframing.org).
The Committee acknowledges and is grateful for the contributions of the numerous
engineers, researchers, producers and others who have contributed to the body of knowledge
on the subjects. The Committee wishes to also express its appreciation for the support of the
Steel Framing Alliance and the Canadian Sheet Steel Building Institute.
PREFACE
This Commentary is intended to facilitate the use, and provide an understanding of the
background, of AISI S213, the North American Standard for Cold-Formed Steel Framing ¡V Lateral
Design. The Commentary illustrates the substance and limitations of the various provisions of the
standard.
Changes are made to the Commentary, which provide background information related to
changes included in Supplement No. 1 to the standard.
In the Commentary, sections, equations, figures, and tables are identified by the same
notation as used in the standard. Words that are italicized are defined in AISI S200. Terms
included in square brackets are specific to LSD terminology.
Note:
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