1、Designation: C955 18Standard Specification forCold-Formed Steel Structural Framing Members1This standard is issued under the fixed designation C955; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A numbe
2、r in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers cold-formed steel structuralframing members (with a base steel thickness of not less than0.0329 in. (0.836 mm) in
3、 load-bearing (transverse and axial)construction assemblies. Steel of lesser thickness shall bepermitted in additional engineered products.1.2 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provide
4、d for information onlyand are not considered standard.1.3 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issue
5、d by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2A653/A653M Specification for Steel Sheet, Zinc-Coated(Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed)by the Hot-Dip ProcessA792/A792M Specification for Steel Sheet, 55 %Alumin
6、um-Zinc Alloy-Coated by the Hot-Dip ProcessA875/A875M Specification for Steel Sheet, Zinc-5 % Alu-minum Alloy-Coated by the Hot-Dip ProcessA1003/A1003M Specification for Steel Sheet, Carbon,Metallic- and Nonmetallic-Coated for Cold-FormedFraming MembersC11 Terminology Relating to Gypsum and Related
7、BuildingMaterials and Systems2.2 AISI Standard:3S100 North American Specification for the Design of Cold-Formed Steel Structural MembersS240 North American Standard for Cold-Formed SteelStructural Framing2015 Edition3. Terminology3.1 Definitions:3.1.1 Definitions shall be in accordance with Terminol
8、ogyC11.3.2 Definitions of Terms Specific to This Standard:3.2.1 members, nstuds, runners, tracks, bracing, bridging,accessories, or other items manufactured in accordance withthis specification.3.2.2 structural member, na member in a steel framedsystem in which the loading exceeds any of the followi
9、ngconditions: a transverse load of 20 lbf/ft (290 N/m) of memberlength, or an axial load, exclusive of sheathing, of 200 lbf(890 N) per member.4. Materials and Manufacture4.1 Members shall be manufactured from steel meeting therequirements of Specification A1003/A1003M.4.2 The minimum steel thicknes
10、s (base steel) shall be notless than 0.0329 in. (0.84 mm).4.3 Individual measurements before the application of pro-tective coating shall be not less than 95 % of the specifieddesign thickness.4.4 Members shall comply with the corrosion protectionrequirements as listed in AISI S240, Section A4.4.5 E
11、dges of members shall be manufactured to minimizeburrs and sharp edges.4.6 Factory punch-outs, when provided, shall be locatedalong the centerline of the webs of members and shall havecenter-to-center spacing of not less than 24 in. (610 mm). Webpunch-outs maximum width shall be the lesser of 0.5 ti
12、mes themember depth, d, or 212 in. (64 mm). Web punch-out lengthshall not exceed 412 in. (114 mm). Minimum distance betweenthe end of the member and the near edge of the web punch-out1This specification is under the jurisdiction of ASTM Committee C11 onGypsum and Related Building Materials and Syste
13、ms and is the direct responsibilityof Subcommittee C11.02 on Specifications and Test Methods for Accessories andRelated Products.Current edition approved June 1, 2018. Published June 2018. Originallyapproved in 1981. Last previous edition approved in 2017 as C955 17. DOI:10.1520/C0955-18.2For refere
14、nced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American Iron and Steel Institute (AISI), 1140 Connectic
15、utAve., NW, Suite 705, Washington, DC 20036, http:/www.steel.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance w
16、ith internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1shall be 10 in. (254 mm). The size of t
17、he factory punch-outsshall not exceed the size used in design and the center-to-centerspacing shall not be less than that used in design.4.7 The properties and strength of members shall be com-puted in accordance with the AISI S100.5. Dimensions and Permissible Variations5.1 Data for calculating des
18、ign performance shall be sup-plied by the manufacturer.5.2 The width of the surface to which the sheathing board isattached shall be not less than 114 in. (32 mm).5.3 Runners (track) shall be formed in a U-shapedconfiguration, having a depth compatible with that of the studsof the same nominal size.
19、5.4 Minimum height of runner (track) flanges shall be114 in. (32 mm).5.5 Members shall comply with the manufacturing toler-ances as listed in AISI S240, Section A5.4.5.6 Bracing and bridging shall have configuration and steelthickness to provide secondary support for the studs in accor-dance with th
20、e AISI S100.6. Workmanship, Finish, and Appearance6.1 The steel members shall be free of defects that interferewith the purpose for which they are intended.7. Inspection7.1 Inspection of the members shall be agreed upon betweenthe purchaser and the producer or supplier as part of thepurchase agreeme
21、nt.8. Rejection8.1 When specified in the purchase agreement, membersthat fail to conform to the requirements of this specificationshall be rejected. Rejection shall be reported to the producer orsupplier promptly and in writing. The notice of rejection shallcontain a statement documenting how the me
22、mber has failed toconform to the requirements of this specification and thepurchase agreement.9. Certification9.1 When specified in the purchase agreement, a producersor suppliers report shall be furnished at the time of shipmentcertifying that the product is in compliance with this specifi-cation.1
23、0. Marking and Identification10.1 See AISI S240, Section A5.5Product Identification.11. Protection11.1 Material shall be protected during shipment as re-quired. When specified in the purchase order, the membersshall be packaged in accordance with the purchasers instruc-tions.11.2 When materials are
24、stored outside, they shall bestacked off the ground and be properly supported on a levelsurface.12. Keywords12.1 runners; screws; section properties; studs; thicknessTABLE 1 Coating DesignationsCoatingClassificationCoatingDesignatorMinimum Coating RequirementsZinc-CoatedAZinc IronB55 % Al-ZincCZinc-
25、5 %Doz/ft2(g m2) oz/ft2(g m2) oz/ft2(g m2) oz/ft2(g m2)Metallic Coated CP 60 G60 (Z 180) A60 (ZF 180) AZ 50 (AZM 150) GF 30 (ZGF 90)CP 90 G90 (Z 275) Not Applicable AZ 50 (AZM 150) GF 45 (ZGF 135)Painted Metallic PM The metallic coated substrate shall meet the requirements of metallic coated. In add
26、ition, the paint film shallhave a minimum thickness of 0.5 mil (0.013 mm) per side (primer plus topcoat) with a minimum primer thick-ness of 0.1 mil (0.0002 mm) per side.EAZinc-coated steel sheet as described in Specification A653/A653M.BZinc-iron alloy-coated steel sheet as described in Specificati
27、on A653/A653M.C55 % Aluminum-zinc alloy-coated steel sheet as described in Specification A792/A792M.DZinc-5 % aluminum alloy-coated steel sheet as described in Specification A875/A875M.EIn accordance with the requirements of Specification A1003/A1003M.C955 182SUMMARY OF CHANGESCommittee C11 has iden
28、tified the location of selected changes to this standard since the last issue (C955 17)that may impact the use of this standard. (Approved June 1, 2018.)(1) Revised 4.4 to reference AISI S240, Section A4.(2) Revised 5.5 to reference AISI 240, Section A5.4.(3) Removed previous Table 2 and Fig. 1.Comm
29、ittee C11 has identified the location of selected changes to this standard since the last issue(C955 151) that may impact the use of this standard. (Approved June 1, 2017.)(1) Revised title.(2) Revised Scope, Subsection 1.1.(3) Revised Section 10.1 to change reference from AISI S200,Section A5 to AI
30、SI S240, Section A5.5.(4) Revised Referenced Documents to delete AISI S200 andadd AISI AS240.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determinati
31、on of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdr
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