1、Designation: E661 03 (Reapproved 2015)1Standard Test Method forPerformance of Wood and Wood-Based Floor and RoofSheathing Under Concentrated Static and Impact Loads1This standard is issued under the fixed designation E661; the number immediately following the designation indicates the year oforigina
2、l adoption or, in the case of revision, the year 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.1NOTEUnits information was editorially corrected in March 2015.INTRODUCTIONDur
3、ing construction and occupancy of a building, floor and roof sheathing are subjected toconcentrated loads that frequently govern the thickness required. Static loads may simulate either foottraffic, or loads from fixtures, when applied through loading disks of appropriate size. Impact loadswill occu
4、r during construction and also in service.Roof sheathing and subflooring are likely to be critical in strength or stiffness, or both, under foottraffic and construction loads, while single-layer floors are generally critical under fixture loads, foottraffic, and in-service impact loads. Subfloors, l
5、ike single floors, must also support fixture loads, butthey will have an additional layer of material, such as underlayment above, which will help todistribute concentrated loads.1. Scope1.1 This test method covers procedures for determining theresistance to deflection and damage of floor and roof s
6、heathingused in site-built construction subjected to concentrated staticloads as well as impact loads from nonrigid blunt objects. It isapplicable to wood and wood-based panels and boards, but isnot intended to cover profiled metal decks, nor precast orcast-in-place slabs. Surface indentation is not
7、 evaluated sepa-rately from deflection.1.2 Three applications are covered: roof sheathing,subfloors, and single floors. Roof sheathing is tested in both adry and a wet condition, while subfloors and single floors areboth tested in a dry condition, as well as a condition of havingdried out after bein
8、g wet. These moisture conditions are thosecommonly experienced with site-built construction.NOTE 1Where it is anticipated that sheathing will be subjected only todry conditions during construction and use, or else to greater moistureexposure than is indicated in 7.3.2, the corresponding exposure con
9、ditionsmay be modified by agreement between the interested parties. Forexample, shop-built construction may be tested dry only, although thepossibility of exposure to high humidity or leaks and flooding during useshould be considered.1.3 The values stated in inch-pound units are to be regardedas sta
10、ndard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this s
11、tandard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D1517 Terminology Relating to LeatherE575 Practice for Reporting Data from Structural Tests ofBuilding Constructions, Eleme
12、nts, Connections, and As-sembliesE631 Terminology of Building Constructions2.2 Other Standards:Fed. Spec. V-T-291E(1) Linen Thread33. Terminology3.1 See Terminology E631 for terms related to this standard.1This test method is under the jurisdiction of ASTM Committee E06 onPerformance of Buildings an
13、d is the direct responsibility of Subcommittee E06.11on Horizontal and Vertical Structures/Structural Performance of Completed Struc-tures.Current edition approved March 1, 2015. Published March 2015. Originallyapproved in 1978. Last previous edition approved in 2009 as E661 03 (2009).DOI: 10.1520/E
14、0661-03R15E01.2For referenced ASTM standards, visit the ASTM website, www.astm.org, 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 DLA Document Services, Building
15、 4/D, 700 Robbins Avenue,Philadelphia, PA 19111-5094, http:/quicksearch.dla.milCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14. Summary of Test Method4.1 Roof and floor sheathing specimens are subjected toconcentrated loads applied
16、through a 3-in. (76-mm) or a 1-in.(25-mm) diameter loading disk, depending on the intended useand the properties to be evaluated. They are also subjected tothe impact of a shot-filled drop bag. Specimens are tested in ahorizontal position, mounted on fully supported framing mem-bers and with loads a
17、pplied to the top surface near an edge, orat a location determined to be more vulnerable. Any supportframing may be used that is representative of the anticipatedservice, as the framing is not considered a major test variable.5. Significance and Use5.1 The procedures outlined will provide data that
18、can beused to evaluate the structural performance, under concentratedloads, of roof and floor sheathing, separate from the effects ofthe framing, under simulated conditions representative of thosein actual service.5.2 The procedures are intended to be applied to roof orfloor sheathing materials inst
19、alled directly to framing. They arenot intended for the evaluation of the framed assembly as awhole.6. Apparatus6.1 Concentrated LoadThe apparatus for the concentratedload test shall conform to the following requirements (see Fig.1):6.1.1 SupportsThe framing members shall be supported inorder not to
20、 deflect under the applied loads. The support systemshall include provisions for rigidly restraining the ends of theframing members, as with blocking and clamps, to preventrotation or vertical movement during testing.6.1.2 Loading DeviceAny convenient means may be usedfor applying a compressive load
21、 up to ultimate, and formeasuring the load within 61 % accuracy. Load shall beapplied through a ball-and-socket joint to assure even applica-tion.6.1.3 Loading DisksTwo steel disks are required, onehaving a diameter of 1 in. (25 mm), representing a concentratedload, and one of 3 in. (76 mm) represen
22、ting foot traffic, eachwith a thickness of at least 0.50 in. (13 mm). The edge of theloading disk contacting the test specimen shall be rounded to aradius not exceeding 0.06 in. (1.5 mm).6.1.4 Deflection Gage, mounted on a rigid tripod whose legsrest on the sheathing immediately above the framing me
23、mbersFIG. 1 Concentrated Static Load ApparatusE661 03 (2015)12that are adjacent to the load point (Fig. 1). The deflection gageshould have a range exceeding the maximum anticipateddeflection, have a maximum error of 61 %, and be graduatedto 0.001 in. (0.02 mm).6.2 Impact LoadThe apparatus for the im
24、pact load testshall conform to the requirements of 6.1.1 6.1.4. In addition,the following equipment shall be used:6.2.1 Drop BagThe bag shall be constructed as in 6.2.1.1 6.2.1.3 (see Fig. 2).6.2.1.1 LeatherThe leather used in construction of the bagshall be harness leather (oak tanned from packer h
25、ides) orlatigo leather (alum and vegetable tanned), or both. It shall beselected from a back or a side to contain enough area of therequired thickness. Leather thickness shall be expressed inounces (1 oz =164 in. (0.4 mm). The above terms areexplained in Terminology D1517.6.2.1.2 ThreadThread used t
26、o fabricate the bag shall belinen, of four or more plies, meeting the requirements for TypeB, Class 1 or 2, of Fed. Spec. V-T-291E(1).6.2.1.3 FabricationThe bag shall be 28 in. (710 mm) highby 29 in. (735 mm) in circumference, with a sidewall of 8-ozleather18 in. (3 mm) thick. The vertical edges sha
27、ll be sewntogether flesh side out and the seam shall be reinforced with apiece of 8-oz leather overlapping38 in. (9 mm) on each side.The side shall then be turned hair side out and sewn to thebottom. The base (bottom disk) shall be 9 to 1012 in. (230 to265 mm) in diameter of 12-oz leather316 in. (5
28、mm) thick. Theseam attaching the sidewall to the base shall be14 in. (6 mm)(1) Leather Use harness leather (oak-tanned from packer hides) or latigo leather (alum and vegetable tanned) (see Terminology D1517 for definitions of terms) (1-ozleather =164 in. (0.4 mm) thick).(2) ThreadUse linen thread (m
29、inimum four-ply) in accordance with Fed. Spec. V-T-291E(1), Type B, Class 1 or 2. Double-stitch sidewall seam and seam attachingsidewall to base.(3) Metal ShotUse shot (0.039 to 0.138-in. (1 to 3.5-mm) diameter). Fill bag with shot and cover with two layers of 3-in. (76-mm) foam rubber. Adjust total
30、 weight ofassembly to 30 lb (13.6 kg) 612 %, or more, when specified (see 6.2.1.4).FIG. 2 Leather Drop Bag AssemblyE661 03 (2015)13from the edge of the base. Two rows of stitching shall be usedfor the vertical sidewall seam and the seam attaching thesidewall to the base.(1) The strap to hoist the ba
31、g shall be made from 8-ozleather18 in. (3 mm) thick by58 in. (16 mm) wide by 24 in.(610 mm) long. The strap shall be passed through holes,diametrically opposite, in the sidewalls 112 in. (40 mm) fromthe top of the wall. These holes shall be reinforced with piecesof 8-oz leather 3 in. (76 mm) square.
32、 The leather strap shall bepassed twice through a 2-in. (50-mm) diameter lifting ring andthe ends fastened by sewing, riveting, or by use of a buckle.(2) To avoid excessive stretching of the leather sidewall orfailure of the vertical seam, a sleeve, made from 12-oz leather,of the same type as the ba
33、se of the bag, shall be fitted to sliptightly over the lower portion of the bag. This sleeve should be978 in. (250 mm) high.6.2.1.4 ShotThe bag shall be loosely filled with metal shotor pellets with diameters of 0.039 to 0.138 in. (1 to 3.5 mm).Two layers of 3-in. (76-mm) thick foam rubber or simila
34、rpadding shall be placed over the metal shot to prevent spillageduring testing. Adjust the total weight of the drop bag andmetal shot to the weight specified in Table 1, 612 %. Thisvalue shall be verified before impact tests are conducted. Forspans greater than 48 in. (1220 mm), the weight of the dr
35、op bagshall be as agreed upon between the interested parties.6.2.2 Measuring RodA measuring rod, graduated in 6-in.(152-mm) increments and equipped with a sliding pointer, shallbe used to measure the drop height of the bag.7. Test Specimens7.1 Select specimens that are representative of the productb
36、eing evaluated, both in accordance with the inherent structuralproperties, including density, and in accordance with thethickness and thickness tolerances characteristic of the product.Unless otherwise specified, the number of tests shall be such asto develop the desired confidence level for each pr
37、opertymeasured, but conduct at least ten tests as a minimum for eachtest condition evaluated.NOTE 2A specimen can usually be made from a single panel, orassembled from a number of boards (see Figs. 3 and 4).7.2 Specimen Size:7.2.1 LengthThe specimen length perpendicular to themain framing members sh
38、all conform to the center-to-centerspacing, S, anticipated in service (Figs. 3 and 4). Wheresheathing is continuous over more than one span, its lengthshall be equal to the minimum number of spans permitted orrecommended for the product used and its intendedapplication, multiplied by the center-to-c
39、enter spacing of theframing members.7.2.2 WidthThe specimen width shall be at least 2312 in.(595 mm). The specimen width shall conform to its nominalwidth when edges are fully supported. When edges areunsupported or partially supported, sheathing may be trimmedto a width not less than 2312 in. (595
40、mm).7.2.3 ThicknessMeasure and report thickness of allsheathing specimens after conditioning in accordance with7.3.1 and report.7.2.4 Cut the sheathing to the required size prior to condi-tioning.7.3 Conditioning of SheathingPrior to static and impacttesting, subject sheathing to wetting and drying
41、to simulatepossible typical construction conditions. Test sheathing in-tended for roof applications under both dry and wet conditions,as described in 7.3.1 and 7.3.2. Test sheathing intended forsubfloor or single-layer floor application both dry and in are-dried condition after exposure to wet condi
42、tions, in accor-dance with 7.3.1 and 7.3.3. This sheathing may also be testedunder wet conditions in accordance with 7.3.2 (see Note 1).7.3.1 Dry TestsCondition sheathing to either constantweight or moisture content or for at least 2 weeks, at 68 6 6F(20 6 3C) and 65 6 5 % relative humidity.7.3.2 We
43、t TestsExpose sheathing to a continuous waterspray for 3 days, applied to the top surface of the sheathing ata rate such as to keep this surface continuously wet. Positionthe sheathing so as to preclude water ponding on it, orimmersion of any portion.NOTE 3A simplified spray tank may be used to supp
44、ort the sheathingin an approximately vertical position during exposure to the water spray.The tank should be fitted with drains so that water spray does notaccumulate, and the sheathing should be placed on blocks to elevate itslower edge above the residual water in the tank bottom.7.3.3 Re-dried Tes
45、tsExpose sheathing to the 3-day waterspray in accordance with 7.3.2 and then dry in accordance with7.3.1.7.4 Fabrication of Test SpecimensInstall the conditionedsheathing on framing as shown in Figs. 3 and 4, using the typeof framing, fastener schedule, and installation details asplanned for use in
46、service; consider this a part of the testconditions. After fabrication, test specimens promptly at am-bient laboratory conditions.NOTE 4Where sheathing is installed on wood framing, the framingmay be of any species and grade commonly used in construction that hasa specific gravity of 0.40 to 0.55, o
47、ven-dry basis, with a maximummoisture content of 19 %. If nails are used, they may be double-headed tosimplify disassembly of the specimen upon completion of testing, provid-ing such nails will not damage the testing equipment. Framing may bereused for more than one test, provided it has not been si
48、gnificantlydamaged by previous testing.8. Procedure8.1 Concentrated Static Load TestsApply the concen-trated static load at one location on the top surface of thesheathing, midway between framing members (see Fig. 3).8.1.1 If the edge of the sheathing is fully supported betweenmain framing members,
49、apply the concentrated load at mid-width. If the edge is unsupported, or partially supported, asTABLE 1 Drop Bag Weights for Impact Load TestsSheathing Span, STotal Weight of Drop Bag(Including Shot), lb (kg)S # 24 in. (610 mm) 30 (13.6)24 in. (610 mm) 48 in. (1220 mm)AASee 6.2.1.4.E661 03 (2015)14with clips or a tongue and groove joint, apply the load 212 in.(65 mm) in from the unsupported or partially supported edge asshown in Fig. 3.8.1.2 Specimens may be used for more than one testprovided the test locations are at leas
