1、Designation: C 645 07aStandard Specification forNonstructural Steel Framing Members1This standard is issued under the fixed designation C 645; 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 p
2、arentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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
3、 interior construction assemblies.1.2 The values stated in inch-pound units are to be regardedas the standard. The SI (metric) values given in parentheses areprovided for information purposes only.1.3 The following safety hazards caveat pertains only to thetest methods portion, Sections 9 and 10, of
4、 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 applicability of regulatorylimitations prior to use.2.
5、Referenced Documents2.1 ASTM Standards:2A 653/A 653M Specification for Steel Sheet, Zinc-Coated(Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed)by the Hot-Dip ProcessA 1003/A 1003M Specification for Steel Sheet, Carbon,Metallic- and Nonmetallic-Coated for Cold-Formed Fram-ing MembersC11 Terminol
6、ogy Relating to Gypsum and Related Build-ing Materials and SystemsC 1396/C 1396M Specification for Gypsum BoardC 754 Specification for Installation of Steel Framing Mem-bers to Receive Screw-Attached Gypsum Panel ProductsC 1002 Specification for Steel Self-Piercing TappingScrews for the Application
7、of Gypsum Panel Products orMetal Plaster Bases to Wood Studs or Steel Studs2.2 AISI Standard:Specification for the Design of Cold-Formed Steel StructuralMembers33. Terminology3.1 DefinitionsDefinitions shall be in accordance withTerminology C11.3.2 Definitions of Terms Specific to This Standard:3.2.
8、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 which i
9、s 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 manufactu
10、red from steel meeting therequirements of Specification A 1003/A 1003M.4.2 Members shall have a protective coating conforming toSpecification A 653/A 653M G 40 minimum or shall have aprotective coating with an equivalent corrosion resistance.4.3 Members shall be manufactured from steel having aminim
11、um 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 which theyare used will carry the design transver
12、se 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 calculatingdesign performance.NOTE 1Allowable def
13、lection varies depending on the cladding used1This 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 e
14、dition approved Aug. 1, 2007. Published August 2007. Originallyapproved in 1970. Last previous edition approved in 2007 as C 645 07.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume inform
15、ation, 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.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM Internatio
16、nal, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.and 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 penetration
17、 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 dep
18、th 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 be
19、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 frict
20、ion. 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.FIG. 1 Minimum Drywall Stud Cross SectionTABLE 1 Manufacturing TolerancesDimensionAItem CheckedDrywall Studs,in. (mm)Drywall Track,in. (mm)A length +18
21、 (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)+18 (3.18)18 (3.18)G camber132 per ft (0.79)12 max (12
22、.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 dimension for stud; inside for track.C 645 07a27. Cu
23、touts7.1 Cutouts shall 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 Specifications for the Design ofCold-Formed
24、Steel Structural Members (See Tables 2 and 3and Figs. 1 and 3).9. Performance Requirements9.1 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
25、 independently verified testperformance that meets the limiting height values listed inSpecification C 754 need not meet the minimum thicknesslimitation set forth in 4.3 or the minimum section properties setforth in 8.1.10. Penetration Test10.1 Significance and UseThis test method provides aprocedur
26、e for evaluating the members ability to pull the headof a screw below the surface of gypsum board. It shall be usedto determine compliance with this specification. The degree ofperformance of this test method with service performance hasnot been determined.10.2 Apparatus shall satisfy the following:
27、10.2.1 Electric Drill, capable of 2500 r/min (free spindlespeed), supplied with a screw driving bit to fit the screw usedin the test.10.2.2 Stop Watch, capable of being read to the nearest 0.1s.10.3 Materials shall satisfy the following:FIG. 2 Manufacturing TolerancesFIG. 3 Hat Furring Channel Cross
28、 SectionC 645 07a310.3.1 WallboardSpecification C 1396/C 1396M, Type X,58 in. (16 mm) thick.10.3.2 ScrewsSpecification C 1002, Type S, minimum 1in. (25.4 mm) long.10.3.3 Kraft Paper0.010 in. (0.254 mm) thick.10.4 SamplingOne member shall be selected from eachbundle or package but not more than ten f
29、rom 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 in. (460 mm) long.10.5.2 For each test, one piece of wallboard, 6 in. (12.7 mm)square, shall be cut from not less than 12 in. (305 mm) from theedge or end of the
30、 wallboard.10.5.3 For each test, four pieces of kraft paper, 2 in. (51mm) square shall be cut.10.6 ProcedureAssemble the member, gypsum board andkraft paper on a rigid, flat surface. (See Fig. 4 for studs, Fig. 5for furring channels.) Drive the screw, using the electric drillwhile applying a force (
31、dead weight and applied force) of 30lbf (112.2 N). Drive the screw to slightly below the surface ofTABLE 2 Minimum Section Properties for Various StudsSectionDesignatorAStudDepthDesignThicknessMinimum Base MetalThicknessBEffective PropertiesCArea IxDMain. (mm) in. (mm) in. (mm) in2(mm2)in4(1000 mm4)
32、 (in-k) (N-m)162S125-18 1.625 41 0.0188 0.478 0.0179 0.454 0.080 52 0.034 14 0.66 75162S125-30 1.625 41 0.0312 0.792 0.0296 0.752 0.132 85 0.060 25 1.16 131162S125-33 1.625 41 0.0346 0.879 0.0329 0.835 0.145 94 0.066 27 1.35 153250S125-18 2.500 64 0.0188 0.478 0.0179 0.454 0.097 63 0.089 37 1.17 132
33、250S125-30 2.500 64 0.0312 0.792 0.0296 0.752 0.159 102 0.159 66 2.06 2.33250S125-33 2.500 64 0.0346 0.879 0.0329 0.835 0.176 114 0.175 73 2.38 269350S125-18 3.500 89 0.0188 0.478 0.0179 0.454 0.115 74 0.197 82 1.72 194350S125-30 3.500 89 0.0312 0.792 0.0296 0.752 0.190 123 0.346 144 3.29 372350S125
34、-33 3.500 89 0.0346 0.879 0.0329 0.835 0.210 135 0.382 159 3.77 426362S125-18 3.625 92 0.0188 0.478 0.0179 0.454 0.118 76 0.215 89 1.78 201362S125-30 3.625 92 0.0312 0.792 0.0296 0.752 0.194 125 0.375 156 3.46 391362S125-33 3.625 92 0.0346 0.879 0.0329 0.835 0.215 138 0.415 173 3.96 448400S125-18E4.
35、000 102 0.0188 0.478 0.0179 0.454 0.125 81 0.265 110 1.96 221400S125-30 4.000 102 0.0312 0.792 0.0296 0.752 0.206 133 0.473 197 3.99 450400S125-33 4.000 102 0.0346 0.879 0.0329 0.835 0.228 147 0.523 218 4.56 515600S125-30 6.000 152 0.0312 0.792 0.0296 0.752 0.268 173 1.259 524 6.54 739600S125-33 6.0
36、00 152 0.0346 0.879 0.0329 0.835 0.297 192 1.391 579 8.06 911AThe 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 th
37、e member flange width in 100ths of an inch, 125 = 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
38、in. (0.836 mm)BMinimum base metal thickness is 95 % of Design Thickness.CEffective properties are calculated in accordance with the AISI “Specification for the Design of Cold-Formed Steel Structural Members,” 1996 edition and are basedon a yield strength, Fy = 33 ksi.DMoment of inertia, Ix, given is
39、 for deflection calculations.EWhere noted, member web height-to-thickness ratio exceeds 200, web stiffeners required at supports.TABLE 3 Hat Furring Channel Section PropertiesMinimum BaseMetal ThicknessAEffective PropertiesBDesign Thickness Gross Area IxCMain (mm) in (mm) in2(mm2)inD(mmD) Ft-Lb (N-m
40、)0.0188 0.477 0.0179 0.453 0.0702 45.29 0.0086 3563 26.4 35.790.0283 0.719 0.0269 0.683 0.1046 67.48 0.0131 5440 44.8 60.740.0312 0.792 0.0296 0.752 0.1184 76.39 0.0144 6010 50.3 68.190.0346 0.879 0.0329 0.835 0.1270 81.94 0.0157 6531 55.4 75.11AMinimum base metal thickness is 95 % of Design Thickne
41、ss.BEffective properties are given as the minimum value for either positive or negative bending.CMoment of inertia given is for deflection calculations.DEffective properties based on Fy = 33 ksi (227 MPa).C 645 07a4the gypsum board. Note if the screw has spun out and thelength of time it takes to pu
42、ll the head of the screw below thesurface.10.7 Number of Tests and Retests:10.7.1 Five specimens of members shall be tested.10.7.2 If more than one test specimen fails to meet therequirements, two more test specimens shall be chosen forretesting.10.8 ReportReport shall indicate all specimens meeting
43、the requirements of this specification if the time read from thestop watch is less than the time specified in Section 9, and thescrew did not spin out; or shall indicate all failing if the timeread is equal to or longer than the time specified in Section 9,or the screw spun out.10.9 Precision and Bi
44、asNo statement is made about eitherthe precision or bias of this test method since the result merelystates 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
45、 or supplier as part ofthe 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 sha
46、llcontain 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 ofshipment certifying that the pro
47、duct is in compliance with thisspecification.14. Marking and Identification14.1 Groups of like members shall be marked with a label,or a tag attached thereto. Marking shall include length, quantityand rollformers member designator including member depth,flange size, and minimum steel thickness in mi
48、ls or inches,exclusive of protective coating.14.2 In addition to the marking referenced in 14.1, indi-vidual members shall have a legible label, stencil, or emboss-ment, at a maximum distance of 96 in. (2440 mm) on center, onthe member, with the following minimum information:14.2.1 The rollformers i
49、dentification (that is, name, logo orinitials).14.2.2 The minimum steel thickness, in mils or inches,exclusive of protective coating.14.2.3 The minimum yield strength in ksi (MPa) if otherthan 33 ksi (230 MPa).14.2.4 The minimum protective coating weight, G-XX, ifother than as specified in Section 4.15. Keywords15.1 furring channels; grid suspension systems; gypsumboard; runners; screws; section properties; spinout; studsFIG. 4 StudsNOTE 1Wallboard specimens shall be taken a minimum of 12 in. (305mm) from eith
