1、Designation: C635/C635M 12C635/C635M 13Standard Specification forthe Manufacture, Performance, and Testing of MetalSuspension Systems for Acoustical Tile and Lay-in PanelCeilings1This standard is issued under the fixed designation C635/C635M; the number immediately following the designation indicate
2、s the yearof original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the
3、 Department of Defense.1. Scope1.1 This specification covers metal ceiling suspension systems used primarily to support acoustical tile or acoustical lay-inpanels.1.2 Some suspension systems incorporate locking assembly details that enhance performance by providing some continuity orload transfer ca
4、pability between adjacent sections of the ceiling grid. The test methods included in this specification do not providethe means for making a complete evaluation of continuous beam systems, nor for assessing the continuity contribution to overallsystem performance. However, the test methods can be us
5、ed for evaluating primary structural members in conjunction withsecondary members that interlock, as well as with those of noninterlocking type.1.3 While this specification is applicable to the exterior installation of metal suspension systems, the atmospheric conditions andwind loading require addi
6、tional design attention to ensure safe implementation. For that reason, a specific review and approvalshould be solicited from the responsible architect and engineer, or both, for any exterior application of metal suspension systemsin the construction of a new building or building modification.1.4 T
7、he values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in eachsystem may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from thetwo systems may result in non-conformance with th
8、e standard.1.5 The following safety hazards caveat pertains only to the test methods described in this specification. This standard does notpurport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard toestablish appropriate sa
9、fety and health practices and determine the applicability of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B117 Practice for Operating Salt Spray (Fog) ApparatusD1735 Practice for Testing Water Resistance of Coatings Using Water Fog Apparatus3. Terminology3.1 Definit
10、ions:3.1.1 Where these terms appear in this specification they shall have the meaning herein indicated as follows:3.1.1.1 backing boarda flat sheet of gypsum board to which acoustical tile is attached using adhesive, screws, staples, or othersuitable means (Fig. 1c).3.1.1.2 bowthe maximum component
11、of deviation in the vertical plane of a main runner, cross runner, or wall molding wherethe centroidal axis of these structural components has been permanently deformed from end to end into the shape of a simpleregular curve during the manufacturing process (Fig. 2).1 This specification is under the
12、 jurisdiction of ASTM Committee E33 on Building and Environmental Acoustics and is the direct responsibility of Subcommittee E33.04on Application of Acoustical Materials and Systems.Current edition approved Oct. 15, 2012May 1, 2013. Published November 2012May 2013. Originally approved in 1969. Last
13、previous edition approved in 20072012 asC635 07.C635 12. DOI: 10.1520/C0635_C0635M-12.10.1520/C0635_C0635M-13.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the sta
14、ndards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurat
15、ely, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
16、1NOTE 1The meanings for bow and camber given here may differ from those applied elsewhere.3.1.1.3 camberthe maximum component of deviation in the horizontal plane of a main runner, cross runner, or wall moldingwhere the centroidal axis of these structural components has been permanently deformed fro
17、m end to end into the shape of a simpleregular curve during the manufacturing process (Fig. 2).3.1.1.4 carrying channel or hanging channelthe three-sided or “”-shaped metal sections that support the entire structural gridnetwork in some forms of mechanical ceiling suspension systems (Fig. 1b). The c
18、arrying channels are usually suspended by hangerwires from the existing structure and the main runners are then attached to the channels.3.1.1.5 ceiling suspension systemthe entire network or grid of structural components, as defined by the ceiling suspensionsystem manufacturer, that provides suppor
19、t for acoustical ceiling tile, acoustical ceiling panels, lighting fixtures, and air diffusers.FIG. 1 Three Types of Ceiling Suspension Systems Showing All ComponentsC635/C635M 1323.1.1.6 cross runnerthe secondary or cross beams of a mechanical ceiling suspension system (Fig. 1, a and b). The crossr
20、unners usually support only the acoustical tile. In some forms of suspension systems, however, the cross runners also providesupport for lighting fixtures, air diffusers, and other cross runners.3.1.1.7 hanger wirethe wire employed to suspend the acoustical ceiling from the existing structure (wood
21、joists, steel barjoists, steel beams, concrete slabs, etc.) (Fig. 1).3.1.1.8 horizontal plane (of a structural component of a ceiling suspension system)a plane parallel to the plane of the ceilingwhich passes through the centroidal axis of the member (Fig. 2).3.1.1.9 interlockinga ceiling system whe
22、re the cross runners are connected to the main runner or other cross runners, or both,at intervals controlled by slots, holes, etc. in the main runners.3.1.1.10 main runnerthe primary or main beams of the type of ceiling suspension system in which the structural members aremechanically locked togeth
23、er (Fig. 1, a and b). The main runners provide direct support for cross runners, and may support lightingfixtures and air diffusers. In addition, the acoustical tile may also be directly supported by the main runners. In some forms ofmechanical ceiling suspension systems, the main runners are suppor
24、ted by hanger wires attached directly to the existing structure.In other forms, the main runners (also referred to as “H” runners, “Z” bars, etc.) are installed perpendicular to carrying channelsand are supported by specially designed sheet metal or wire clips attached to the carrying channels.3.1.1
25、.11 nailing bar or furring barthe continuous sheet metal strips to which a backing board is attached using either nailsor screws (Fig. 1c). The nailing bars are installed perpendicular to and supported by the carrying channels.3.1.1.12 non-interlockinga ceiling system that does not comply with the s
26、pecifications stated in the definition of interlocking.3.1.1.13 splinea strip of metal or fiber inserted in the kerfs of adjacent acoustical tile to form a concealed mechanical jointseal (Fig. 1b).3.1.1.14 twistthe angle of rotation measured in a transverse plane between the two end cross sections o
27、f a main runner, crossrunner, or wall molding which has been permanently deformed during the process of manufacturing (Fig. 2).3.1.1.15 vertical plane (of a structural component of a ceiling suspension system)a plane perpendicular to the plane of theceiling which passes through the centroidal axis o
28、f the member (Fig. 2).3.1.1.16 wall molding the edge angles or channels of a mechanical ceiling suspension system that are attached to a wall (Fig.1, a and b). The wall molding provides support for the acoustical tile, main runners and cross runners that are located at theperiphery of the ceiling.FI
29、G. 2 Diagrams Showing Camber, Bow, and TwistC635/C635M 1334. Classification4.1 The structural performance required from a ceiling suspension system shall be defined by the specifying authority in termsof a suspension system structural classification.4.1.1 The structural classification of ceiling sus
30、pension systems shall be based on the load-carrying capacity of the main runnersof the structural network. Load-carrying capacity as used herein is based on the more stringent requirement of esthetic acceptancerather than the less confining prevention of structural failure. The criterion is the arbi
31、trary but widely established limit of deflectionto 1360 of the span between supports.4.1.2 The load-carrying capacity shall be the maximum uniformly distributed load (pounds per linear foot N/m) that a simplysupported main runner section having a span length of 4 ft, 0 in. 1200 mm is capable of supp
32、orting without the mid-spandeflection exceeding 0.133 in. 3.33 mm or 1360 of the 4 ft, 0 in. 1200 mm span length, as tested in accordance with the methoddescribed in Section 8.4.1.3 The structural classification or grade of ceiling suspension systems shall be determined by the capability of main run
33、nersor nailing bars to support a uniformly distributed load. These classifications shall be:4.1.3.1 Light-Duty Systems, used where ceiling loads other than acoustical tile or lay-in panels are not anticipated, such asresidential and light commercial structures.4.1.3.2 Intermediate-Duty Systems, used
34、 where ceiling loads other than acoustical tile or lay-in panels (light fixtures, airdiffusers, etc.) are anticipated, such as ordinary commercial structures.FIG. 3 Load-Carrying Test Configuration for Inch/Pound UnitsFIG. 4 Load-Carrying Test Configuration for Inch/Pound UnitsC635/C635M 1344.1.3.3
35、Heavy-Duty Systems, used where the quantities and weights of ceiling fixtures (lights, air diffusers, etc.) are greater thanthose for an ordinary commercial structure.4.1.4 For the purpose of determining the structural classification of main runner members as covered in 4.1.2, their simple-span,mini
36、mum load-carrying capabilities, when tested in accordance with the test method described in Section 10, shall be listed asshown in Table 1 and Table 2.4.2 Cross runners shall be capable of carrying the load specified by the manufacturer without exceeding the maximum allowabledeflection equal to 1360
37、 of its span.4.3 The design and definition of the suspension system shall be the responsibility of the manufacturer. Included is selection ofappropriate materials, metal thicknesses, dimensions of necessary component section configurations, design of special hanger andassembly devices, and provision
38、 for whatever accessory items are needed to ensure satisfactory ceiling performance within thescope of this specification.4.3.1 System manufacturers may provide supplementary data describing load deflection capabilities of main runners in eachclassification for spans other than 4 ft 1200 mm.4.4 Wher
39、e specialized loading conditions that are outside the scope of this specification exist, the manufacturer should beconsulted for his recommendations; and, he may furnish engineering data as required. Specification or design of superstructureanchors or fasteners are not the responsibility of the ceil
40、ing system manufacturer unless specified by the ceiling systemmanufacturer as part of the suspension system.5. Dimensional Tolerance5.1 Suspension system structural members shall conform to the following tolerance requirements:5.1.1 Metal Thickness:5.1.1.1 For steel systems the thickness of metal us
41、ed in main runners, cross runners, wall moldings, splines or nailing bars shallbe stated by the suspension system manufacturer in published literature. The thickness in thousandths of an inch of metal and theallowable thickness variation for the component shall be stated.5.1.1.2 For aluminum systems
42、 the thickness of metal used in main runners, cross runners, wall moldings, or splines shall bestated by the suspension system manufacturer in published literature. The thickness in thousandths of an inch of metal and theallowable thickness variation for the component shall be stated.5.1.2 Straightn
43、ess:5.1.2.1 The amount of bow, camber, or twist in main runners, cross runners, wall molding, splines, or nailing bars of variouslengths shall not exceed the values shown in Table 3.5.1.2.2 Main runners, cross runners, wall moldings, splines, or nailing bars of ceiling suspension systems shall not c
44、ontain localkinks or bends.5.1.3 Length:5.1.3.1 The variation in the specified length of main runner sections or cross runner sections that are part of an interlocking gridsystem shall not exceed 60.010 in./4 ft 0.25 mm/1200 mm.5.1.3.2 The variation in the specified spacing of slots or other cutouts
45、 in the webs of main runners or cross runners that areemployed in assembling a ceiling suspension grid system shall not exceed 60.010 in. 0.25 mm.5.1.4 Over-all Cross-section Dimensions:5.1.4.1 For steel systems, the overall height of the cross section of main runners, cross runners, wall molding, o
46、r nailing bar shallbe the specified dimensions 60.030 in. 0.75 mm. The width of the cross section of exposed main runners or cross runners shallbe the specified dimension 60.008 in. 0.20 mm.TABLE 1 Minimum Load-Carrying Capabilities of Main Runners - Inch/Pound UnitsSuspensionSystemDutyClassificatio
47、nAppliedLoad (P)EquivalentUniformLoadAllowable MidspanDeflection (d)lb lb/ft in.Direct HungLight 5.0 5.0 0.133Intermediate 12.0 12.0 0.133Heavy 16.0 16.0 0.133Indirect HungLight 2.0 2.0 0.133Intermediate 3.5 3.5 0.133Heavy 8.0 8.0 0.133Furring BarLight 4.5 4.5 0.133Intermediate 6.5 6.5 0.133Heavy .
48、. .d=span/360C635/C635M 1355.1.4.2 For aluminum systems, the overall height of the cross section and the allowable variation of main runners, cross runners,or wall molding shall be stated by the suspension system manufacturer in published literature and price lists. The width andallowable variation
49、of the cross section of exposed main runners or cross runners shall be similarly stated.5.1.5 Section Squareness:5.1.5.1 Intersecting webs and flanges of structural members (“I”,“ T”, or “Z” sections) shall form angles between them of 9062. If deviations from squareness at more than one such intersection are additive with respect to their use in a ceiling, the total angleshall not be greater than 2.5.1.5.2 The ends of structural members that abut or intersect other members in exposed grid systems shall be cut perpendicularto the exp
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