1、Designation: C645 11aStandard 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 par
2、entheses 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 Department of Defense.1. Scope*1.1 This specification covers nonstructural steel framingmembers in in
3、terior 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 only
4、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 andhealth practices and determine the applic
5、ability of regulatorylimitations prior to use.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 ProcessA1003/A1003M Specification for Steel Sheet, Carbon,Metallic- and Nonmetallic-Coated
6、 for Cold-Formed Fram-ing MembersC11 Terminology Relating to Gypsum and Related BuildingMaterials and SystemsC475/C475M Specification for Joint Compound and JointTape for Finishing Gypsum BoardC1396/C1396M Specification for Gypsum BoardC754 Specification for Installation of Steel Framing Mem-bers to
7、 Receive Screw-Attached Gypsum Panel ProductsC1002 Specification for Steel Self-Piercing Tapping Screwsfor the Application of Gypsum Panel Products or MetalPlaster Bases to Wood Studs or Steel Studs2.2 AISI Standards:3S100 North American Specification for the Design of Cold-Formed Steel Structural M
8、embers, 2007 editionS200 North American Standard for Cold-Formed SteelFraming General Provisions, 2007 Edition2.3 ICC-ES Document4ICC-ES-AC86 Acceptance Criteria for Steel Studs andGypsum-Board Interior Nonload-Bearing WallsComplete ConstructionAC86Approved July 1995(Editorially revised September 20
9、05) (Formerly ICBOAC86 dated July 1995)3. Terminology3.1 DefinitionsDefinitions shall be in accordance withTerminology C11.3.2 Definitions of Terms Specific to This Standard:3.2.1 members, nin screw application of gypsum board,studs, runners (track), hat furring channels, main beams andcross furring
10、 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 which is limited to a lateral (transverse)load of not more than 10 lb/ft2(480 Pa), a superimposedvertical load, exclusive of shea
11、thing 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 manufactured from steel meeting therequirements of Specification A1003/A1003M.4.2 Members shall have a protective coating conformin
12、g toSpecification A653/A653M G 40 minimum or shall have aprotective coating with an equivalent corrosion resistance.1This 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 Specif
13、ications and Test Methods for Accessories andRelated Products.Current edition approved Oct. 1, 2011. Published October 2011. Originallyapproved in 1970. Last previous edition approved in 2011 as C645 11. DOI:10.1520/C0645-11A.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orco
14、ntact 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.or
15、g.4Available from ICC Evaluation Services, Inc., 5360 Workman Mill Road,Whittier, CA 90601, www.icc-es.org.1*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.4.3 Members
16、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 configu-ration and steel thickness such that the system in whi
17、ch 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/240.The manufacturer shall supply sufficient data for cal
18、culatingdesign 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 suspensionsystems, shall be sufficiently rigid to permit penetrati
19、on 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 be manufactured within the limits asshown in Table 1 and Fig. 2.5.3 Rigid Furring ChannelsMinimum d
20、epth shall be78in. (22 mm). Minimum width of furring attachment flanges (seeFig. 3) shall be12 in. (12.7 mm).5.4 Grid suspension systems include main beams and crossfurring members which mechanically interlock to form amodular supporting network. Length tolerance for grid suspen-sion members shall b
21、e 6116 in. (1.59 mm).5.5 Runners (track) shall be formed in a U-shaped configu-ration, having web depth compatible with those of the studs ofthe same nominal size. The runners (track) shall be designedsuch that when the studs are placed in both the top and bottomrunners (track), they are held by fri
22、ction. Minimum height offlanges shall be 1 in. (25 mm).6. Edges6.1 Members shall be manufactured in such a fashion as tominimize burrs and sharp edges.7. Cutouts7.1 Cutouts shall not reduce the performance of the mem-bers in the gypsum board construction assembly below thespecified performance requi
23、rements.FIG. 1 Minimum Drywall Stud Cross SectionC645 11a28. Sectional Properties8.1 The sectional properties of members shall be computedin accordance with AISI S100 (See Tables 2 and 3 and Figs. 1and 3).9. Performance Requirements9.1 PenetrationWhen tested in accordance with Section10, members sha
24、ll 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 July 1995Editorially Revised September 2005) and conform to thelimiting height tables i
25、n Specification C754 need not meet theminimum thickness limitation set forth in 4.3 or the minimumsection properties set forth in 8.1.10. Penetration Test10.1 Significance and UseThis test method provides aprocedure for evaluating the members ability to pull the headof a screw below the surface of g
26、ypsum 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:10.2.1 Power-Driven Drill Screw Gun, capable of 4000 rpm(free spindle speed) wit
27、h a depth-sensitive nose piece, suppliedwith a screw driving bit to fit the screw used in the test.10.2.2 Stop Watch, capable of being read to the nearest 0.1s.10.3 Materials shall satisfy the following:10.3.1 Gypsum WallboardSpecification C1396/C1396M,Type X,58 in. (16 mm) thick.10.3.2 ScrewsSpecif
28、ication C1002, Type S, minimum 1in. (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 t
29、estspecimens not less than 18 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. (300mm) from the edge or end of the gypsum wallboard.10.5.3 For each test, four pieces of paper joint tape, 2 in. (50mm) square shall be c
30、ut.10.6 Procedure10.6.1 Assemble the member, gypsum wallboard and paperjoint tape on a rigid, flat surface. (See Fig. 4 for studs, Fig. 5for 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, all
31、owing the screws to be driven 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
32、the screw gun has either stopped 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
33、 of the test specimens fails 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 me
34、et the requirements of this 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 merelysta
35、tes whether or not there is conformance to the criteria forsuccess specified in the procedure.11. Inspection11.1 Inspection of the members shall be agreed uponbetween the purchaser and the producer or supplier as part ofthe purchase agreement.12. Rejection12.1 When specified in the purchase agreemen
36、t, 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 speci
37、fication and thepurchase agreement.13. Certification13.1 When specified in the purchase agreement, a produc-ers or suppliers report shall be furnished at the time ofshipment certifying that the product is in compliance with thisspecification.TABLE 1 Manufacturing TolerancesDimensionAItem CheckedDryw
38、all Studs,in. (mm)Drywall Track,in. (mm)A length +18 (3.18)14 (6.35)+ 1 (25.40)14 (6.35)BBweb width +132 (0.79)132 (0.79)+18 (3.18)0(0)C flare +116 (1.59) + 0 (0)overbend 116 (1.59) 316 (4.76)D hole centerwidth+18 (3.18)18 (3.18)NAE hole centerlength+14 (6.35)14 (6.35)NAF crown +18 (3.18)18 (3.18)+1
39、8 (3.18)18 (3.18)G camber132 per ft (0.79)12 max (12.7)132 per ft (0.79)12 max (12.7)H bow132 per ft (0.79)12 max (12.7)132 per ft (0.79)12 max (12.7)I twist132 per ft (0.79)12 max (12.7)132 per ft (0.79)12 max (12.7)AAll measurements shall be taken not less than 1 ft (305 mm) from the end.BOutside
40、dimension for stud; inside for track.C645 11a314. Marking and Identification14.1 See AISI S200, Section A5 - Product Identification.15. Protection15.1 Material shall be protected during shipment as re-quired. When specified in the purchase order, the membersshall be packaged in accordance with the p
41、urchasers instruc-tions.15.2 When materials are stored, they shall be stored off theground and be properly supported on a flat surface.16. Keywords16.1 furring channels; grid suspension systems; gypsumboard; runners; screws; section properties; spinout; studsFIG. 2 Manufacturing TolerancesFIG. 3 Hat
42、 Furring Channel Cross SectionC645 11a4TABLE 2 Minimum Section Properties for Various StudsSectionDesignatorAStudDepthDesignThicknessMinimum Base SteelThicknessBGross AreaCEffective PropertiesC,DIxEMn/VFin. (mm) in. (mm) in. (mm) in2(mm2)in4(1000 mm4) (in-k) (N-m)162S125-18 1.625 41 0.0188 0.478 0.0
43、179 0.454 0.080 52 0.034 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 0.1
44、59 102 0.159 66 2.09 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
45、.382 159 3.45 390362S125-18 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 1
46、17 1.64 185400S125-30 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 5
47、74 6.32 714AThe section 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 =
48、1.25 in. (31.8 mm)18 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
49、% of Design Thickness.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 value based on local or distortional buckling. For distortional buckling, KF= 0 and b =1.GWhere noted, member web height-to-thickness ratio exceeds 200, web stiffeners required at supports.TABLE
