ASTM_C_955_-_17.pdf

Designation:C95517Standard 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 number 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 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 provided 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 issued 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 SpecificationforSteelSheet,55%Aluminum-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 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 TerminologyC11.3.2 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 followingconditions: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 thickness(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 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 times themember depth,d,or 212in.(64 mm).Web punch-out lengthshall not exceed 412in.(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 direct 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 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 ConnecticutAve.,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 with 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.1 shall be 10 in.(254 mm).The size of the 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 design perfor