1、Designation: C955 17Standard 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 have a protective coating in accordancewith Table 1, CP 60 minimum.4.5 Edges of members s
11、hall 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 times themember dep
12、th, 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 Systems and is the dir
13、ect responsibilityof Subcommittee C11.02 on Specifications and Test Methods for Accessories andRelated Products.Current edition approved June 1, 2017. Published June 2017. Originallyapproved in 1981. Last previous edition approved in 2015 as C955 151. DOI:10.1520/C0955-17.2For referenced ASTM standa
14、rds, 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 ConnecticutAve., NW, Suit
15、e 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 with internationa
16、lly 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.1Mon Apr 30 45 shall be 10 in. (254 mm). The size of the
17、 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 desig
18、n 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.5.
19、4 Minimum height of runner (track) flanges shall be114 in. (32 mm).5.5 Members shall be manufactured within the limits asshown in Table 2 and Fig. 1.5.6 Bracing and bridging shall have configuration and steelthickness to provide secondary support for the studs in accor-dance with the AISI S100.TABLE
20、 1 Coating DesignationsCoatingClassificationCoatingDesignatorMinimum Coating RequirementsZinc-CoatedAZinc IronB55 % Al-ZincCZinc-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
21、(AZM 150) GF 45 (ZGF 135)Painted Metallic PM The metallic coated substrate shall meet the requirements of metallic coated. In addition, 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.E
22、AZinc-coated steel sheet as described in Specification A653/A653M.BZinc-iron alloy-coated steel sheet as described in Specification 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 Specificati
23、on A875/A875M.EIn accordance with the requirements of Specification A1003/A1003M.TABLE 2 Manufacturing TolerancesDimensionAItem Checked Structural Studs, in. (mm) Structural Track, in. (mm)A length+18 (3.18)332 (2.38)+12 (12.7)14 (6.35)BBweb width+132 (0.79)132 (0.79)+132 (0.79)+18 (3.18)Cflare +116
24、 (1.59) + 0 (0)overbend 116 (1.59) 332 (2.38)Dhole center +116 (1.59)n/awidth 116 (1.59)Ehole center +12 (12.7)n/aalong length 12 (12.7)F crown+116 (1.59)116 (1.59)+116 (1.59)116 (1.59)GCcamber18 (3.2) max per 10 ft132 per ft (0.79)12 max (12.7)HCbow18 (3.2) max per 10 ft132 per ft (0.79)12 max (12.
25、7)I twist132 per ft (0.79)132 per ft (0.79)12 max (12.7)12 max (12.7)J flange width+18 (3.18)116 (1.59)+14 (6.35)116 (1.59)K stiffening lip length+18 (3.18)132 (0.79)n/aAAll measurements shall be taken not less than 1 ft (305 mm) from the end.BOutside dimension for stud; inside for track.C 18 in. (3
26、 mm) max per 10 ft (3000 mm) represents L/960 maximum for overall camber and bow. Thus a 20-ft (6000-mm) long member would have14 in.(6mm)permissible maximum; a 5-ft (1500-mm) long member would have116 in. (1.5 mm) permissible maximum.C955 172Mon Apr 30 45 6. Workmanship, Finish, and Appearance6.1 T
27、he 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 agreement.8. Rejection8.1 When specified in the purchase agree
28、ment, 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 member has failed toconform to the requirements of this s
29、pecification 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.10. Marking and Identification10.1 See AISI S240, Sectio
30、n 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 stored outside, they shall bestacked off the ground and
31、 be properly supported on a levelsurface.12. Keywords12.1 runners; screws; section properties; studs; thicknessFIG. 1 Manufacturing TolerancesC955 173Mon Apr 30 45 SUMMARY OF CHANGESCommittee C11 has identified the location of selected changes to this standard since the last issue(C955 151) that may
32、 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 AISI S240, Section A5.5.(4) Revised Referenced Documents to delete AISI S200 andadd AISI AS240.Committee C11 has ide
33、ntified the location of selected changes to this standard since the last issue (C955 11c)that may impact the use of this standard. (Approved March 15, 2015.)(1) Previous subsection 1.3, Sections 5 and 8, and Fig. 1, allregarding the penetration test, were removed.ASTM International takes no position
34、 respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.T
35、his 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 withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM In
36、ternational Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address show
37、n below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 174Mon Apr 30 45
