1、Designation: C 645 08aStandard 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 StructuralMembers3AISI Code of Standard Practice for Cold-Formed SteelStructural Framing Committee on Framing Standards 2005 Edition32.3 ICC-ES Document4ICC-
8、ES-AC86 Acceptance Criteria for Steel Studs andGypsum-Board Interior Nonload-Bearing WallsComplete ConstructionAC86Approved July 1995(Editorially revised September 2005) (Formerly ICBOAC86 dated July 1995)3. Terminology3.1 DefinitionsDefinitions shall be in accordance withTerminology C11.3.2 Definit
9、ions 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 members of grid suspension systems or otheritems manufactured in accordance with this specification.3.2.2 nonstructural wall stud, na
10、 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 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 a
11、nd Manufacture4.1 Members shall be manufactured 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 sh
12、all be manufactured from steel having aminimum thickness, individual measurement of 0.0179 in.(0.455 mm) before application of protective coating.1This specification is under the jurisdiction of ASTM Committee C11 onGypsum and Related Building Materials and Systems and is the direct responsibilityof
13、 Subcommittee C11.02 on Specifications and Test Methods for Accessories andRelated Products.Current edition approved March 1, 2008. Published March 2008. Originallyapproved in 1970. Last previous edition approved in 2008 as C 645 08.2For referenced ASTM standards, visit the ASTM website, www.astm.or
14、g, 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.s
15、teel.org.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.5. Di
16、mensions 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 transverse loads without exceed-ing either the allowable stress of the steel or the allowabledesign deflection. Mai
17、n 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 deflection varies depending on the cladding usedand architectural requirements. Detailed requirements shall be
18、 specified inapplication specifications.5.1.1 Members, except main beams of grid suspensionsystems, 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 shal
19、l 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 depth shall be78in. (22 mm). Minimum width of furring attachment flanges (seeFig. 3) shall be12 in. (12.7 mm).FIG. 1 Minimum Drywall Stud Cross SectionTAB
20、LE 1 Manufacturing TolerancesDimensionAItem CheckedDrywall 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 centerl
21、ength+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 (12.7)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 t
22、aken not less than 1 ft (305 mm) from the end.BOutside dimension for stud; inside for track.C 645 08a25.4 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 6116
23、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 friction.
24、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 requirements
25、.8. Sectional Properties8.1 The sectional properties of members shall be computedin accordance with AISI Specifications for the Design ofCold-Formed Steel Structural Members (See Tables 2 and 3and Figs. 1 and 3).9. Performance Requirements9.1 PenetrationWhen tested in accordance with Section10, memb
26、ers 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 July 1995Editorially Revised September 2005) and conform to thelimiting height t
27、ables in Specification C 754 need not meet theminimum thickness limitation set forth in 4.3 or the minimumsection properties set forth in 8.1.FIG. 2 Manufacturing TolerancesFIG. 3 Hat Furring Channel Cross SectionC 645 08a310. Penetration Test10.1 Significance and UseThis test method provides aproce
28、dure 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 followi
29、ng: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:10.3.1 WallboardSpecification C 1396/C 1396M, Type X,58 in.
30、(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 from any oneshipment for testing.10.5 Specimen Preparation:10.5.1 Each member t
31、o 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 wallboard.TABLE 2 Minimum Section Properties for Various StudsSectionDesignat
32、orAStudDepthDesignThicknessMinimum Base MetalThicknessBEffective PropertiesCArea IxDMain. (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 0.034 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
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 132250S125-30 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
34、 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 372350S125-33 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
35、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 448400S125-18E4.000 102 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.
36、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 6.000 152 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 de
37、signates 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 designates the minimum base metal thickness in mils, 18 = 0.0179 in. (0.454 mm)30 designates th
38、e 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 metal thickness is 95 % of Design Thickness.CEffective properties are calculated in accordance with the AISI “Specification for the Design
39、 of Cold-Formed Steel Structural Members,” 1996 edition and are basedon a yield strength, Fy = 33 ksi.DMoment of inertia, Ix, given is for deflection calculations.EWhere noted, member web height-to-thickness ratio exceeds 200, web stiffeners required at supports.TABLE 3 Hat Furring Channel Section P
40、ropertiesMinimum BaseMetal ThicknessAEffective PropertiesBDesign Thickness Gross Area IxCMain (mm) in (mm) in2(mm2)inD(mmD) Ft-Lb (N-m)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 0.01
41、44 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 Thickness.BEffective properties are given as the minimum value for either positive or negative bending.CMoment of inertia given is for deflection calculations.DEffective pro
42、perties based on Fy = 33 ksi (227 MPa).C 645 08a410.5.3 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
43、electric drillwhile applying a force (dead weight and applied force) of 30lbf (112.2 N). Drive the screw to slightly below the surface ofthe gypsum board. Note if the screw has spun out and thelength of time it takes to pull the head of the screw below thesurface.10.7 Number of Tests and Retests:10.
44、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 meetingthe requirements of this specification if the time read from thestop watch is
45、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 BiasNo statement is made about eitherthe precision or bias of this test method s
46、ince 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 or supplier as part ofthe purchase agreement.12. Rejection12.1 When specified
47、 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 r
48、equirements 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 product is in compliance with thisspecification.14. Marking and Identification14.
49、1 Groups of like members shall be marked with a label,or a tag attached thereto. Marking shall include the rollformersidentification (name, logo, or initials), length, quantity androllformers member designator including member depth,flange size, and minimum steel thickness in mils 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 mem
