1、Designation: D7672 11aStandard Specification forEvaluating Structural Capacities of Rim Board Products andAssemblies1This standard is issued under the fixed designation D7672; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the yea
2、r of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.INTRODUCTIONRim board assemblies are an engineered component within light-frame wood platform construction.Rim board assembli
3、es may serve in multiple structural capacities, including: providing floor closureand diaphragm attachment, transferring vertical and in-plane lateral loads, restricting out-of-planerotation and lateral translation at the ends of the floor joists, providing deck ledger attachment, andspanning wall o
4、penings as a header material. Rim board products, which serve a principal role as acomponent integrated within a rim board assembly, can vary by wood species, size, shape, and type.Rim board products and assemblies require evaluation of their mechanical properties, physicalproperties, and their resp
5、onse to end use environments. Procedures established in this Specificationprovide a means to test rim board products and assemblies, to judge their acceptability, and to establishallowable design capacities.1. Scope1.1 This specification provides procedures for testing andestablishing the structural
6、 capacities of proprietary rim boardproducts and assemblies for use in light-frame wood construc-tion using I-joist or structural composite lumber joist framing.It does not apply to rim board products manufactured to acommodity rim board standard.1.2 This specification was developed in light of curr
7、entlymanufactured panel, structural composite lumber, and pre-fabricated I-joist rim board products as defined in 3.2. Mate-rials that do not conform to the definitions of 3.2 are beyondthe scope of this specification.1.3 Fire safety, sound transmission, building envelope per-formance, and cutting/n
8、otching attributes of rim board prod-ucts and assemblies are all items that may need to beconsidered in an end-use application. These items fall outsidethe scope of this specification.1.4 This specification primarily considers end use in dryservice conditions, such as most protected framing members,
9、where the equilibrium moisture content for solid-sawn lumberis less than 16 %.1.5 This specification provides methods to establish “allow-able stress” design resistances for use with the National DesignSpecification for Wood Construction (NDS). Derivation ofdesign resistances from the test data in a
10、ccordance with “loadand resistance factor design” or “limit states design” arebeyond the scope of this specification.1.6 Quality control requirements are outside the scope ofthis Specification.1.7 The performance of a rim board product will be affectedby the constituent wood species, geometry, adhes
11、ive, andproduction parameters. Therefore, rim board products pro-duced by each individual manufacturer shall be evaluated todetermine their product properties, regardless of the similarityin characteristics to products produced by other manufacturers.1.8 Where a manufacturer produces product in more
12、 thanone facility, each production facility shall be evaluated inde-pendently. For additional production facilities, any revisions tothe full qualification program in accordance with this specifi-cation shall be approved by an accredited, independent quali-fying agency.1.9 The values stated in inch-
13、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.1This specification is under the jurisdiction of ASTM Committee D07 on Woodand is the direct responsibility of Subc
14、ommittee D07.05 on Wood Assemblies.Current edition approved Nov. 15, 2011. Published December 2011. Lastprevious edition approved in 2011 as D767211E01. DOI: 10.1520/D767211a.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.1.10 This
15、standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2
16、.1 ASTM Standards:2D9 Terminology Relating to Wood and Wood-Based Prod-uctsD198 Test Methods of Static Tests of Lumber in StructuralSizesD1037 Test Methods for Evaluating Properties of Wood-Base Fiber and Particle Panel MaterialsD2395 Test Methods for Specific Gravity of Wood andWood-Based Materials
17、D2915 Practice for Sampling and Data-Analysis for Struc-tural Wood and Wood-Based ProductsD4442 Test Methods for Direct Moisture Content Measure-ment of Wood and Wood-Base MaterialsD4761 Test Methods for Mechanical Properties of Lumberand Wood-Base Structural MaterialD5055 Specification for Establis
18、hing and Monitoring Struc-tural Capacities of Prefabricated Wood I-JoistsD5456 Specification for Evaluation of Structural CompositeLumber ProductsD7033 Practice for Establishing Design Capacities for Ori-ented Strand Board (OSB) Wood-Based Structural-UsePanelsF1667 Specification for Driven Fasteners
19、: Nails, Spikes,and Staples2.2 Other Standards:NDS ANSI/AF(2) attachment of the rim board to wall plates above and below;(3) attachment of the rim board to the joist ends; (4) attachmentof exterior wall siding to the rim board; and (5) attachment ofany required hardware to the face. While it is perm
20、issible todevelop most of these capacities based upon the materialproperties established in 4.4 and the relevant design provisionsof the NDS, the in-plane lateral load capacity of the rimassembly shall be empirically established as outlined in thisSpecification. If the rim board assembly with a rect
21、angularwood-based rim board is to be additionally qualified to supportan exterior deck ledger, then deck ledger fastener attachmentsmust also be developed. The procedure outlined in thisSpecification can be used for the qualification of deck ledgerattachments. Alternative deck ledger attachment qual
22、ificationprocedures may be used in lieu of those contained within thisspecification provided that they consider all potential failuremodes, including deck ledger splitting perpendicular-to-grain.4.4 Product Specific Requirements:4.4.1 I-joist Rim Board ProductsI-joist rim board prod-ucts must be qua
23、lified as an I-joist framing material inaccordance with Specification D5055, have a minimum flangewidth of 1.5 in. (38 mm), and a minimum manufactured lengthof 8 ft. (2.4 m). I-joists with sawn lumber flanges shall haveestablished fastener capacities into the face and edge thatcomply with the provis
24、ions of the NDS. I-joists with structuralcomposite lumber flanges shall have fastener capacities estab-lished in accordance with Specification D5456. Deck ledgerattachments to I-joist rim board products fall outside the scopeof this specification.4.4.2 Rectangular Wood-Based Rim BoardsRectangularwoo
25、d-based rim board products shall have a minimum thick-ness of 1.0 in. (25 mm) and a minimum manufactured length of8 ft. (2.4 m). Additionally, they shall satisfy the following.4.4.2.1 Structural Composite LumberStructural compos-ite lumber rim board products shall be made from a materialqualified in
26、 accordance with Specification D5456. The axialtension and compression capacities need not be qualified forrim board applications unless the product will be permitted tobe used as a drag strut or diaphragm chord. SCL rim boardproducts shall have fastener capacities into the edge and faceestablished
27、in accordance with Specification D5456. Where aSpecification D5456 test method requires minimum specimendimensions that exceed the product thickness, testing the rimboard with its actual thickness shall be permitted.4.4.2.2 Proprietary Plywood and Oriented Strand BoardProprietary plywood and oriente
28、d strand board rim boardproducts shall be initially qualified in accordance with PS-1 orPS-2. In addition, when used as a structural header, theedgewise bending performance of proprietary plywood andoriented strand board rim board products shall be evaluated inaccordance with the Specification D5456
29、 requirements forlaminated veneer lumber or oriented strand lumber, respec-tively. This evaluation shall include, but is not limited to,relevant considerations applicable to edgewise bending, suchas edgewise flexure, shear, and bearing design load establish-ment, duration of load, volume effects, mo
30、isture content, etc.The axial tension and compression capacities need not bequalified in accordance with Specification D5456 for rim boardapplications unless the product will be used as a drag strut ordiaphragm chord. Where a Specification D5456 specified testFIG. 2 Orientation for Rim BoardD7672 11
31、a3method requires minimum specimen dimensions that exceedthe product thickness, testing the rim board with its actualthickness shall be permitted. Proprietary plywood and OSB rimboard products shall have fastener capacities into the edge andface that either comply with published values in the NDS or
32、have been developed in accordance with Practice D7033.5. Qualification5.1 GeneralThis section describes procedures, both em-pirical and analytical, for initial qualification of the structuralcapacities of rim board products and assemblies. Qualificationis required for typical details of rim board ap
33、plication sincethey are used commonly and influence structural capacities.5.2 Qualification ProcessRim board products shall betested in accordance with Section 6 and evaluated in accor-dance with Section 7. The allowable design values anddurability targets shall comply with the limitations specified
34、 byTable 1.5.2.1 When deck ledger attachments are qualified for rect-angular wood-based rim board products using the procedureoutlined in this specification, they shall comply with thelimitations specified in Table 2.5.2.2 When a manufacturer chooses not to establish aconcentrated vertical load capa
35、city in accordance with theprovisions 6.3 and 7.3, then squash blocks or alternativedetailing provisions shall be provided to address concentratedload transfer through the rim board assembly.5.3 SamplingSamples for qualification testing shall berepresentative of the population being evaluated. When
36、amodification to the manufacturing process results in a reduc-tion in properties, new qualification testing is required. Sam-pling of the test material shall be done in accordance with theapplicable portions of Section 3, “Statistical Methodology,” ofPractice D2915.5.4 WitnessingQualification tests
37、shall be conducted orwitnessed by a qualified agency in accordance with Section 8.All test results are to be certified by an accredited, independentqualifying agency.5.5 Moisture Content and DensityMoisture content shallbe measured and reported for each rim board product specimentested in the qualif
38、ication program in accordance with TestMethods D4442. The moisture content of other assemblycomponents does not need to be determined. As an alternativeto testing a full cross-section, only the moisture content of theflange materials needs to be tested for I-joist rim boardproducts. Specific gravity
39、 shall be measured and reported forrectangular rim board products in accordance with Test Meth-ods D2395. As an alternative, product density may be reportedbased upon the specimen weight divided by the specimenvolume at the tested moisture content.5.6 Test Equipment TolerancesTests in accordance wit
40、hthis specification are to be conducted using a machine orapparatus calibrated in accordance with Practices E4.6. Mechanical Testing6.1 Uniform Vertical Load TransferThe uniform verticalload transfer capability of the rim board assembly is basedupon the X-orientation compressive capacity of the rim
41、boardillustrated in Fig. 2. As specified in 7.1, the rim board verticalload capacity shall be determined based upon the lower of adirect test or calculation. Section 6.1.2 outlines the test used todirectly establish the capacity. Section 6.1.3 describes testingneeded to establish the X-orientation c
42、ompression strength andTABLE 1 Assembly LimitationsMinimumRim BoardThicknessAUniform Vertical LoadTransfer Design Capacity(X direction)Lateral Load TransferDesign Capacity(L direction)MinimumRetainedLateralLoadTransferDurabilityBMaximumAverageThicknessSwellCMinimumDMaximum Minimum MaximumE75 % 10 %1
43、.0 in.(25 mm)2000 plf(29.2 kN/m)360 psi(2.48 N/mm2)x rim board thicknessF180 plf(2.63 kN/m)190 plf(2.77 kN/m)1.125 in.(29 mm)220 plf(3.21 kN/m)1.25 in.(32 mm)and greaterNot LimitedAFor the purposes of this table, the thickness of I-joist rim board is the flange width.BThe retained lateral load trans
44、fer durability is the ratio of the average durability lateral load transfer capacity divided by the dry lateral load transfer capacity as outlinedin 7.5.CThe thickness swell requirements apply only to rectangular rim board products. The average calculated thickness swell for all specimens from a fiv
45、e-panel sampleoriginally conditioned in accordance with 6.4.2 shall not exceed 10 % and no individual value may be more than 12 %.DLower uniform vertical load capacities are permitted to be qualified when the product is limited to engineered construction.EFor rim board productions having a thickness
46、 between 1 in. (25 mm) and 1.25 in. (32 mm), the allowable capacity shall be interpolated between the following values:1.0 in. (25 mm) 190 plf (2.77 kN/m)1.125 in. (29 mm) 220 plf (3.21 kN/m)1.25 in. (32 mm) 240 plf (3.50 kN/m)The 240 plf (3.50 kN/m) capacity for 1.25-in. thick (32 mm) rim board is
47、added in this category for interpolation purposes only.FThe 360 psi (2.48 N/mm2) stress is based upon the established compression perpendicular-to-grain design capacity of commodity floor sheathing products. Thequalified compression perpendicular-to-grain capacity of a proprietary floor sheathing is
48、 permitted to be used in lieu of this value for specific applications that combine therim board with the proprietary floor sheathing product.D7672 11a4stiffness of the material as required to complete the calculation.Section 6.1.4 describes an alternative weak-axis flatwise bend-ing test that can be
49、 used to determine the X-orientation stiffnessin lieu of an axial measurement.6.1.1 ConditioningThe rim board material tested in 6.1.2,6.1.3, and 6.1.4 shall be conditioned to equilibrium moisturecontent prior to testing under standardized atmospheric condi-tions of 68 6 11F (20 6 6C) and 65 6 5 % relative humidity.Alternatively, material tested in accordance with 6.1.2 ispermitted to be tested “as received” and without supplementalconditioning provided that the higher load factor of 7.1.1 isused for design load development.6.1.2 Direct Test of Uniform Vertical Load Tr
