1、Designation: C645 18Standard Specification forNonstructural Steel Framing Members1This standard is issued under the fixed designation C645; 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 pare
2、ntheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope*1.1 This specification covers nonstructural steel framingmembers i
3、n interior construction assemblies.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 The following safety hazards caveat pertains o
4、nly to thetest methods portion, Sections 9 and 10, of this specification:This standard does not purport to address all of the safetyconcerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety,health, and environmental practices and
5、determine the appli-cability of regulatory limitations prior to use.1.4 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-me
6、ndations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2A1003/A1003M Specification for Steel Sheet, Carbon,Metallic- and Nonmetallic-Coated for Cold-FormedFraming MembersC11 Terminology Relating to Gypsum and Related Build
7、ingMaterials and SystemsC475/C475M Specification for Joint Compound and JointTape for Finishing Gypsum BoardC754 Specification for Installation of Steel Framing Mem-bers to Receive Screw-Attached Gypsum Panel ProductsC1002 Specification for Steel Self-Piercing Tapping Screwsfor Application of Gypsum
8、 Panel Products or MetalPlaster Bases to Wood Studs or Steel StudsC1396/C1396M Specification for Gypsum Board2.2 AISI Standards:3S100 North American Specification for the Design of Cold-Formed Steel Structural Members, 2007 editionS220 North American Standard for Cold-Formed SteelFramingNonstructura
9、l Members, 2015 Edition2.3 ICC-ES Document4ICC-ES-AC86 Acceptance Criteria for Cold-formed SteelFraming MembersInterior Nonload-bearing WallAssembliesApproved May 20123. Terminology3.1 DefinitionsDefinitions shall be in accordance withTerminology C11.3.2 Definitions of Terms Specific to This Standar
10、d:3.2.1 members, nin screw application of gypsum board,studs, runners (track), hat furring channels, main beams, andcross furring members of grid suspension systems or otheritems manufactured in accordance with this specification.3.2.2 nonstructural wall stud, na member in a steelframed wall system
11、which is limited to a lateral (transverse)load of not more than 10 lb/ft2(480 Pa), a superimposedvertical load, exclusive of sheathing materials, of not more than100 lbf/ft (1460 N/m), or a superimposed vertical load of notmore than 200 lbs (890 N).4. Materials and Manufacture4.1 Members shall be ma
12、nufactured from steel meeting therequirements of Specification A1003/A1003M.4.2 Members shall have a protective coating in accordancewith AISI S220, Section A5.1This specification is under the jurisdiction of ASTM Committee C11 onGypsum and Related Building Materials and Systems and is the direct re
13、sponsibilityof Subcommittee C11.02 on Specifications and Test Methods for Accessories andRelated Products.Current edition approved June 1, 2018. Published June 2018. Originallyapproved in 1970. Last previous edition approved in 2014 as C645 141. DOI:10.1520/C0645-18.2For referenced ASTM standards, v
14、isit 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,
15、 Washington, DC 20036, http:/www.steel.org.4Available from ICC Evaluation Services, Inc., 5360 Workman Mill Road,Whittier, CA 90601, www.icc-es.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
16、 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 T
17、echnical Barriers to Trade (TBT) Committee.14.3 Members shall be manufactured from steel having aminimum thickness, individual measurement of 0.0179 in.(0.455 mm), before application of protective coating.5. Dimensions and Permissible Variations5.1 Studs and rigid furring channels shall have a confi
18、gu-ration and steel thickness such that the system in which theyare used will carry the design transverse loads without exceed-ing either the allowable stress of the steel or the allowabledesign deflection. Main beams and cross furring of gridsuspension systems shall be limited to a deflection of L/
19、240.The manufacturer shall supply sufficient data for calculatingdesign performance.NOTE 1Allowable deflection varies depending on the cladding usedand architectural requirements. Detailed requirements shall be specified inapplication specifications.5.1.1 Members, except main beams of grid suspensio
20、nsystems, shall be sufficiently rigid to permit penetration of thescrew.5.1.2 Minimum width of face to which gypsum board isscrew-attached shall be not less than 114 in. (32 mm).5.1.3 Minimum lip dimension shall be316 in. (5 mm). (SeeFig. 1.)5.2 Members shall comply with the manufacturing toler-ance
21、s as listed in AISI S220, Section A6.4.5.3 Rigid Furring ChannelsMinimum depth shall be78 in.(22 mm). Minimum width of furring attachment flanges (seeFig. 2) shall be12 in. (12.7 mm).5.4 Grid suspension systems include main beams and crossfurring members which mechanically interlock to form amodular
22、 supporting network. Length tolerance for grid suspen-sion members shall be 6116 in. (1.59 mm).5.5 Runners (track) shall be formed in a U-shapedconfiguration, having web depth compatible with those of thestuds of the same nominal size. The runners (track) shall bedesigned such that when the studs ar
23、e placed in both the topand bottom runners (track), they are held by friction. Minimumheight of flanges shall be 1 in. (25 mm).6. Edges6.1 Members shall be manufactured in such a fashion as tominimize burrs and sharp edges.FIG. 1 Minimum Drywall Stud Cross SectionC645 1827. Cutouts7.1 Cutouts shall
24、not reduce the performance of the mem-bers in the gypsum board construction assembly below thespecified performance requirements.8. Sectional Properties8.1 The sectional properties of members shall be computedin accordance with AISI S100 (see Tables 1 and 2 and Figs. 1and 2).9. Performance Requireme
25、nts9.1 PenetrationWhen tested in accordance with Section10, members shall be capable of pulling the head of the screwbelow the surface of the gypsum board in less than 2 s withoutspin out.9.2 Members that can show certified third party testing inaccordance with ICC-ES-AC86 (Approved May 2012), andco
26、nform to the limiting height tables in Specification C754,need not meet the minimum thickness limitation set forth insubsection 4.3 or the minimum section properties set forth insubsection 8.1.10. Penetration Test10.1 Significance and UseThis test method provides aprocedure for evaluating the member
27、s ability to pull the headof a screw below the surface of gypsum wallboard. It shall beused to determine compliance with this specification. Thedegree of performance of this test method with service perfor-mance has not been determined.10.2 Apparatus Shall Satisfy the Following:FIG. 2 Hat Furring Ch
28、annel Cross SectionTABLE 1 Minimum Section Properties for Various StudsSectionDesignatorAStudDepthDesignThicknessMinimum Base SteelThicknessBGross AreaCEffective PropertiesC,DIxEMn/Fin. (mm) in. (mm) in. (mm) in2(mm2)in4(1000 mm4) (in-k) (N-m)162S125-18 1.625 41 0.0188 0.478 0.0179 0.454 0.080 52 0.
29、034 14 0.61 69162S125-30 1.625 41 0.0312 0.792 0.0296 0.752 0.132 85 0.060 25 1.19 134162S125-33 1.625 41 0.0346 0.879 0.0329 0.835 0.145 94 0.066 27 1.37 155250S125-18 2.500 64 0.0188 0.478 0.0179 0.454 0.097 63 0.910 38 1.03 116250S125-30 2.500 64 0.0312 0.792 0.0296 0.752 0.159 102 0.159 66 2.09
30、236250S125-33 2.500 64 0.0346 0.879 0.0329 0.835 0.176 114 0.175 73 2.40 272350S125-18 3.500 89 0.0188 0.478 0.0179 0.454 0.115 74 0.203 84 1.42 161350S125-30 3.500 89 0.0312 0.792 0.0296 0.752 0.190 123 0.346 144 2.96 335350S125-33 3.500 89 0.0346 0.879 0.0329 0.835 0.210 135 0.382 159 3.45 390362S
31、125-18 3.625 92 0.0188 0.478 0.0179 0.454 0.118 76 0.221 92 1.48 167362S125-30 3.625 92 0.0312 0.792 0.0296 0.752 0.194 125 0.376 157 3.08 348362S125-33 3.625 92 0.0346 0.879 0.0329 0.835 0.215 138 0.415 173 3.59 406400S125-18G4.000 102 0.0188 0.478 0.0179 0.454 0.125 81 0.281 117 1.64 185400S125-30
32、 4.000 102 0.0312 0.792 0.0296 0.752 0.206 133 0.474 197 3.44 388400S125-33 4.000 102 0.0346 0.879 0.0329 0.835 0.228 147 0.524 218 4.01 453600S125-30 6.000 152 0.0312 0.792 0.0296 0.752 0.268 173 1.223 513 5.39 609600S125-33 6.000 152 0.0346 0.879 0.0329 0.835 0.297 192 1.378 574 6.32 714AThe secti
33、on designator defines the cold-formed steel framing member dimensions.Example: 350S125-18350 designates the member web depth in 100ths of an inch, 350 = 3.50 in. (88.9 mm)S designates the type of member, S = Stud125 designates the member flange width in 100ths of an inch, 125 = 1.25 in. (31.8 mm)-18
34、 designates the minimum base metal thickness in mils, 18 = 0.0179 in. (0.454 mm)-30 designates the minimum base metal thickness in mils, 30 = 0.0296 in. (0.752 mm)-33 designates the minimum base metal thickness in mils, 33 = 0.0329 in. (0.836 mm)BMinimum base steel thickness is 95 % of Design Thickn
35、ess.CProperties are based on a centerline radius of332 in. (2.38 mm), see Fig. 1.DEffective properties are calculated in accordance with AISI S100 and are based on a yield strength, Fy = 33 ksi.EMoment of inertia, Ix, given is for deflection calculations.FAllowable moment is taken as the lowest valu
36、e based on local or distortional buckling. For distortional buckling, K= 0 and =1.GWhere noted, member web height-to-thickness ratio exceeds 200, web stiffeners required at supports.C645 18310.2.1 Power-Driven Drill Screw Gun, capable of 4000 rpm(free spindle speed) with a depth-sensitive nose piece
37、, suppliedwith a screw driving bit to fit the screw used in the test.10.2.2 Stop Watch, capable of being read to the nearest0.1 s.10.3 Materials Shall Satisfy the Following:10.3.1 Gypsum WallboardSpecification C1396/C1396M,Type X,58 in. (16 mm) thick.10.3.2 ScrewsSpecification C1002, Type S, minimum
38、1 in. (25.4 mm) long.10.3.3 Paper Joint TapeSpecification C475/C475M.10.4 SamplingOne member shall be selected from eachbundle or package, but not more than ten from any oneshipment for testing.10.5 Specimen Preparation:10.5.1 Each member to be tested shall be cut into testspecimens not less than 18
39、 in. (460 mm) long.10.5.2 For each test, one piece of gypsum wallboard, 6 in.(150 mm) square, shall be cut from not less than 12 in.(300 mm) from the edge or end of the gypsum wallboard.10.5.3 For each test, four pieces of paper joint tape, 2 in.(50 mm) square shall be cut.10.6 Procedure:10.6.1 Asse
40、mble the member, gypsum wallboard, and paperjoint tape on a rigid, flat surface. (See Fig. 3 for studs, Fig. 4for furring channels.)10.6.2 Prior to performing the test, drive several screwswithout the paper joint tape to set the depth of the nose pieceon the screw gun, allowing the screws to be driv
41、en below thesurface of the wallboard without breaking the gypsum wall-board face paper.10.6.3 Drive the screw through the paper joint tape, usingthe screw gun, while applying a force (dead weight and appliedforce) of 30 lbf (112.2 N). Drive the screw until the nosepieceof the screw gun has either st
42、opped and seated the screw or thescrew spins out. Record if the screw has spun out and if itexceeds2stoseat the screw in the gypsum wallboard.10.7 Number of Tests and Retests:10.7.1 A sample consisting of five specimens of membersshall be tested.10.7.2 If not more than one of the test specimens fail
43、s tomeet the requirements, the sample has met the requirements.10.7.3 If two of the five test specimens fail to meet therequirements, two additional test specimens shall be chosen forretesting. If either of the two additional test specimens fail, thesample has failed to meet the requirements of this
44、 test.10.8 ReportReport shall indicate the total number ofspecimens tested and the number of specimens meeting therequirements of this specification.10.9 Precision and BiasNo statement is made about eitherthe precision or bias of this test method since the result merelystates whether or not there is
45、 conformance to the criteria forsuccess specified in the procedure.TABLE 2 Hat Furring Channel Section PropertiesDesign Thickness Minimum BaseSteel ThicknessAGross AreaBEffective PropertiesB,C,DIxEMn/Fin (mm) in (mm) in2(mm2)in4 D(mm4)Din-k (N-m)0.0188 0.477 0.0179 0.453 0.0702 45.29 0.0086 3563 0.3
46、2 36.160.0283 0.719 0.0269 0.683 0.1046 67.48 0.0131 5440 0.54 61.020.0312 0.792 0.0296 0.752 0.1152 74.32 0.0143 5953 0.61 68.980.0346 0.879 0.0329 0.835 0.1270 81.94 0.0157 6531 0.66 74.58AMinimum base steel thickness is 95 % of Design Thickness.BProperties are based on a centerline radius of332 i
47、n. (2.38 mm).CEffective properties are given as the minimum value for either positive or negative bending.DEffective properties calculated in accordance with AISI S100 and are based on Fy = 33 ksi (227 MPa).EMoment of inertia given is for deflection calculations.FAllowable moment based on local buck
48、ling.FIG. 3 StudsNOTE 1Wallboard specimens shall be taken a minimum of 12 in. (305mm) from either edge and either end of wallboard panel.FIG. 4 Hat Furring ChannelsC645 18411. Inspection11.1 Inspection of the members shall be agreed uponbetween the purchaser and the producer or supplier as part ofth
49、e purchase agreement.12. Rejection12.1 When specified in the purchase agreement, membersthat fail to conform to the requirements of the 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 specification and thepurchase agreement.13. Certification13.1 When specified in the purchase agreement, a produc-ers or suppliers report shall be furnished at the time ofshipmen
