1、Designation: E 661 03 (Reapproved 2009)An American National StandardStandard Test Method forPerformance of Wood and Wood-Based Floor and RoofSheathing Under Concentrated Static and Impact Loads1This standard is issued under the fixed designation E 661; the number immediately following the designatio
2、n indicates the year oforiginal 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.INTRODUCTIONDuring construction and occupancy of
3、 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 occur during construction and also in
4、 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, like single floors, must also supp
5、ort 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 sheathingused in site-built constr
6、uction 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 evaluated sepa-rately from defle
7、ction.1.2 Three applications are covered: roof sheathing, sub-floors, and single floors. Roof sheathing is tested in both a dryand a wet condition, while subfloors and single floors are bothtested in a dry condition, as well as a condition of having driedout after being wet. These moisture condition
8、s 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 conditionsmay be modified by agree
9、ment 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 metric (SI) units are to be regardedas the standard.1.4 This standard do
10、es 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 Documents2.1 ASTM Sta
11、ndards:2D 1517 Terminology Relating to LeatherE 575 Practice for Reporting Data from Structural Tests ofBuilding Constructions, Elements, Connections, and As-sembliesE 631 Terminology of Building Constructions2.2 Other Standards:Fed. Spec. V-T-291E(1) Linen Thread33. Terminology3.1 See Terminology E
12、 631 for terms related to this stan-dard.4. Summary of Test Method4.1 Roof and floor sheathing specimens are subjected toconcentrated loads applied through a 76-mm (3-in.) or a25-mm (1-in.) diameter loading disk, depending on the in-tended use and the properties to be evaluated. They are also1This t
13、est method is under the jurisdiction of ASTM Committee E06 onPerformance of Buildings and is the direct responsibility of Subcommittee E06.11on Horizontal and Vertical Structures/Structural Performance of Completed Struc-tures.Current edition approved April 1, 2009. Published May 2009. Originallyapp
14、roved in 1978. Last previous edition approved in 2003 as E 661 03.2For 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 web
15、site.3Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.subjected to the impact of a shot-filled drop bag
16、. Specimens aretested in a horizontal position, mounted on fully supportedframing members and with loads applied to the top surface nearan edge, or at a location determined to be more vulnerable.Anysupport framing may be used that is representative of theanticipated service, as the framing is not co
17、nsidered a majortest variable.5. Significance and Use5.1 The procedures outlined will provide data that 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 those
18、in actual service.5.2 The procedures are intended to be applied to roof orfloor sheathing materials installed 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 th
19、e following requirements (see Fig.1):6.1.1 SupportsThe framing members shall be supportedin order not to deflect under the applied loads. The supportsystem shall include provisions for rigidly restraining the endsof the framing members, as with blocking and clamps, toprevent rotation or vertical mov
20、ement during testing.6.1.2 Loading DeviceAny convenient means may be usedfor applying a compressive load 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, o
21、nehaving a diameter of 25 mm (1 in.), representing a concentratedload, and one of 76 mm (3 in.) representing foot traffic, eachwith a thickness of at least 13 mm (0.50 in.). The edge of theloading disk contacting the test specimen shall be rounded to aradius not exceeding 1.5 mm (0.06 in.).6.1.4 Def
22、lection Gage, mounted on a rigid tripod whose legsrest on the sheathing immediately above the framing membersthat 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 0.02 mm (0.0
23、01 in.).FIG. 1 Concentrated Static Load ApparatusE 661 03 (2009)26.2 Impact LoadThe apparatus for the impact 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.
24、1.1 LeatherThe leather used in construction of the bagshall be harness leather (oak tanned from packer hides) 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 inounce
25、s (1 oz = 0.4 mm (164 in.). The above terms areexplained in Terminology D 1517.6.2.1.2 ThreadThread used to 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 710 mm (28 in.) highby 7
26、35 mm (29 in.) in circumfrence, with a sidewall of 8-ozleather 3 mm (18 in.) thick. The vertical edges shall be sewntogether flesh side out and the seam shall be reinforced with apiece of 8-oz leather overlapping 9 mm (38 in.) on each side.The side shall then be turned hair side out and sewn to theb
27、ottom. The base (bottom disk) shall be 230 to 265 mm (9 to1012 in.) in diameter of 12-oz leather 5 mm (316 in.) thick. Theseam attaching the sidewall to the base shall be 6 mm (14 in.)(1) LeatherUse harness leather (oak-tanned from packer hides) or latigo leather (alum and vegetable tanned) (see Ter
28、minology D 1517 for definitions of terms) (1-ozleather =164 in. (0.4 mm) thick).(2) ThreadUse linen thread (minimum four-ply) per Fed. Spec. V-T-291, Type B, Class 1 or 2. Double-stitch sidewall seam and seam attaching sidewall to base.(3) Metal ShotUse shot (1 to 3.5-mm (0.039 to 0.138-in.) diamete
29、r). Fill bag with shot and cover with two layers of 76-mm (3-in.) foam rubber. Adjust total weight ofassembly to 13.6 kg (30 lb) 612 %, or more, when specified (see 6.2.1.4).FIG. 2 Leather Drop Bag AssemblyE 661 03 (2009)3from the edge of the base. Two rows of stitching shall be usedfor the vertical
30、 sidewall seam and the seam attaching thesidewall to the base.(1) The strap to hoist the bag shall be made from 8-ozleather 3 mm (18 in.) thick by 16 mm (58 in.) wide by 610 mm(24 in.) long. The strap shall be passed through holes, diametri-cally opposite, in the sidewalls 40 mm (112 in.) from the t
31、op ofthe wall. These holes shall be reinforced with pieces of 8-ozleather 76 mm (3 in.) square. The leather strap shall be passedtwice through a 50-mm (2-in.) diameter lifting ring and theends fastened by sewing, riveting, or by use of a buckle.(2) To avoid excessive stretching of the leather sidewa
32、ll orfailure of the vertical seam, a sleeve, made from 12-oz leather,of the same type as the base of the bag, shall be fitted to sliptightly over the lower portion of the bag. This sleeve should be250 mm (978 in.) high.6.2.1.4 ShotThe bag shall be loosely filled with metal shotor pellets with diamet
33、ers of 1 to 3.5 mm (0.039 to 0.138 in.).Two layers of 76-mm (3-in.) thick foam rubber or similarpadding 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
34、before impact tests are conducted. Forspans greater than 1220 mm (48 in.), the weight of the drop bagshall be as agreed upon between the interested parties.6.2.2 Measuring RodA measuring rod, graduated in152-mm (6-in.) increments and equipped with a sliding pointer,shall be used to measure the drop
35、height of the bag.7. Test Specimens7.1 Select specimens that are representative of the productbeing evaluated, both in accordance with the inherent structuralproperties, including density, and in accordance with thethickness and thickness tolerances characteristic of the product.Unless otherwise spe
36、cified, the number of tests shall be such asto develop the desired confidence level for each propertymeasured, 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
37、).7.2 Specimen Size:7.2.1 LengthThe specimen length perpendicular to themain framing members shall 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 permitte
38、d orrecommended for the product used and its intended applica-tion, multiplied by the center-to-center spacing of the framingmembers.7.2.2 WidthThe specimen width shall be at least 595 mm(2312 in.). The specimen width shall conform to its nominalwidth when edges are fully supported. When edges areun
39、supported or partially supported, sheathing may be trimmedto a width not less than 595 mm (2312 in.).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 Con
40、ditioning of SheathingPrior to static and impacttesting, subject sheathing to wetting and drying 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
41、or single-layer floor application both dry and in are-dried condition after exposure to wet conditions, 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 mois
42、ture content or for at least 2 weeks, at 20 6 3C(68 6 6F) and 65 6 5 % relative humidity.7.3.2 Wet 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
43、water ponding on it, orimmersion of any portion.NOTE 3A simplified spray tank may be used to support 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
44、on blocks to elevate itslower edge above the residual water in the tank bottom.7.3.3 Re-dried TestsExpose 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 a
45、nd 4, using the typeof framing, fastener schedule, and installation details asplanned for use in 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
46、any species and grade commonly used in construction that hasa specific gravity of 0.40 to 0.55, oven-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 damag
47、e the testing equipment. Framing may bereused for more than one test, provided it has not been significantlydamaged 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
48、 (see Fig. 3).8.1.1 If the edge of the sheathing is fully supported betweenmain framing members, apply the concentrated load at mid-width. If the edge is unsupported, or partially supported, aswith clips or a tongue and groove joint, apply the load 65 mm(212 in.) in from the unsupported or partially
49、 supported edge asshown in Fig. 3.TABLE 1 Drop Bag Weights for Impact Load TestsSheathing Span, STotal Weight of Drop Bag (IncludingShot), kg (lb)S # 610 mm (24 in.) 13.6 (30)610 mm (24 in.) 1220 mm (48 in.)AASee 6.2.1.4.E 661 03 (2009)48.1.2 Specimens may be used for more than one testprovided the test locations are at least 455 mm (18 in.) apart(measured parallel to the framing), occur in different spans, andshow no sign of damage from other tests.8.2 StiffnessMeasure deflection relative to framing underthe load point, using the 7
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