ASTM C955-18e1
(Specification)Standard Specification for Cold-Formed Steel Structural Framing Members
Standard Specification for Cold-Formed Steel Structural Framing Members
ABSTRACT
This specification covers steel studs, runners (tracks), and bracing or bridging for screw application of gypsum panel products and metal plaster bases in load-bearing construction assemblies. Steel of lesser thickness shall be permitted in additional engineered products. Members shall be manufactured from steel meeting the requirements specified. The properties and strength of members shall be computed in accordance with the given specification. The steel members shall be free of defects that interfere with the purpose for which they are intended. Penetration test method provides a procedure for evaluating the member's ability to pull the head of a screw below the surface of the gypsum panel product. Five specimens of members shall be tested. If more than one test specimen fails to meet the requirements, two more test specimens shall be chosen for retesting. Report shall indicate all specimens meeting the requirements of this specification if the screw penetrated the steel and the screw spin out; or shall indicate all specimens failing if the screw did not penetrate the steel, or the screw spun out.
SCOPE
1.1 This specification covers cold-formed steel structural framing members (with a base steel thickness of not less than 0.0329 in. (0.836 mm)) in load-bearing (transverse and axial) construction assemblies. Steel of lesser thickness shall be permitted in additional engineered products.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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Designation: C955 −18
Standard Specification for
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Cold-Formed Steel Structural Framing Members
This standard is issued under the fixed designation C955; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
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ε NOTE—Table 1 was removed editorially in August 2018.
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1. Scope* 2.2 AISI Standard:
S100 North American Specification for the Design of Cold-
1.1 This specification covers cold-formed steel structural
Formed Steel Structural Members
framing members (with a base steel thickness of not less than
S240 North American Standard for Cold-Formed Steel
0.0329 in. (0.836 mm)) in load-bearing (transverse and axial)
Structural Framing—2015 Edition
construction assemblies. Steel of lesser thickness shall be
permitted in additional engineered products.
3. Terminology
1.2 The values stated in inch-pound units are to be regarded
3.1 Definitions:
as standard. The values given in parentheses are mathematical
3.1.1 Definitions shall be in accordance with Terminology
conversions to SI units that are provided for information only
C11.
and are not considered standard.
3.2 Definitions of Terms Specific to This Standard:
1.3 This international standard was developed in accor-
3.2.1 members, n—studs, runners, tracks, bracing, bridging,
dance with internationally recognized principles on standard-
accessories, or other items manufactured in accordance with
ization established in the Decision on Principles for the
this specification.
Development of International Standards, Guides and Recom-
3.2.2 structural member, n—a member in a steel framed
mendations issued by the World Trade Organization Technical
system in which the loading exceeds any of the following
Barriers to Trade (TBT) Committee.
conditions: a transverse load of 20 lbf/ft (290 N/m) of member
length, or an axial load, exclusive of sheathing, of 200 lbf
2. Referenced Documents
(890 N) per member.
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2.1 ASTM Standards:
A653/A653M Specification for Steel Sheet, Zinc-Coated 4. Materials and Manufacture
(Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed)
4.1 Members shall be manufactured from steel meeting the
by the Hot-Dip Process
requirements of Specification A1003/A1003M.
A792/A792M Specification for Steel Sheet, 55 %
4.2 The minimum steel thickness (base steel) shall be not
Aluminum-Zinc Alloy-Coated by the Hot-Dip Process
less than 0.0329 in. (0.84 mm).
A875/A875M Specification for Steel Sheet, Zinc-5 % Alu-
minum Alloy-Coated by the Hot-Dip Process
4.3 Individual measurements before the application of pro-
A1003/A1003M Specification for Steel Sheet, Carbon,
tective coating shall be not less than 95 % of the specified
Metallic- and Nonmetallic-Coated for Cold-Formed
design thickness.
Framing Members
4.4 Members shall comply with the corrosion protection
C11 Terminology Relating to Gypsum and Related Building
requirements as listed in AISI S240, Section A4.
Materials and Systems
4.5 Edges of members shall be manufactured to minimize
burrs and sharp edges.
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This specification is under the jurisdiction of ASTM Committee C11 on
4.6 Factory punch-outs, when provided, shall be located
Gypsum and Related Building Materials and Systems and is the direct responsibility
along the centerline of the webs of members and shall have
of Subcommittee C11.02 on Specifications and Test Methods for Accessories and
Related Products.
center-to-center spacing of not less than 24 in. (610 mm). Web
Current edition approved June 1, 2018. Published June 2018. Originally
punch-outs maximum width shall be the lesser of 0.5 times the
approved in 1981. Last previous edition approved in 2017 as C955 – 17. DOI:
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member depth, d, or 2 ⁄2 in. (64 mm). Web punch-out length
10.1520/C0955-18E01.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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Standards volume information, refer to the standard’s Document Summary page on Available from American Iron and Steel Institute (AISI), 1140 Connecticut
the ASTM website. Ave., NW, Suite 705, Washington, DC 20036, http://www.steel.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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C955 − 18
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shall not exceed 4 ⁄2 in. (114 mm). Minimum distance between 8. Rejection
the end of the member and the near edge of the web pu
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