1、Designation: E 661 03Standard 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 designation indicates the year oforiginal adoption or, in
2、 the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.INTRODUCTIONDuring construction and occupancy of a building, floor and roof sheathing are subj
3、ected 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 service.Roof sheathing and subflooring are li
4、kely 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 support fixture loads, butthey will have an additi
5、onal 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 construction subjected to concentrated staticloads a
6、s 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 deflection.1.2 Three applications are covered: roof
7、 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 conditions are thosecommonly experienced with site-buil
8、t 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 agreement between the interested parties. Forexampl
9、e, 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 does not purport to address all of thesafety con
10、cerns, 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 Standards:2D 1517 Terminology Relating to Leather
11、E 575 Practice for Reporting Data from Structural Tests ofBuilding Constructions, Elements, Connections, and As-sembliesE 631 Terminology for Building Construction2.2 Other Standards:Fed. Spec. V-T-291E(1) Linen Thread33. Terminology3.1 See Terminology E 631 for terms related to this stan-dard.4. Su
12、mmary 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 test method is under the jurisdiction of ASTM C
13、ommittee 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 Oct. 1, 2003. Published November 2003. Originallyapproved in 1978. Last previous edition appro
14、ved in 1997 as E 661 88 (1997).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 Standardizatio
15、n 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. Specimens aretested in a horizont
16、al 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 considered a majortest variable.5. S
17、ignificance 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 thosein actual service.5.2 The procedur
18、es 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 the following requirements (see Fig.
19、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 movement during testing.6.1.2 Loading
20、 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, onehaving a diameter of 25 mm (1 in
21、.), 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 Deflection Gage, mounted on a rigid t
22、ripod 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 (0.001 in.).FIG. 1 Concentrated Static
23、 Load ApparatusE6610326.2 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).6.2.1.1 LeatherThe leather used in construction
24、 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 inounces (1 oz = 0.4 mm (164 in.). The above terms
25、 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 735 mm (29 in.) in circumfrence, with a side
26、wall 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 thebottom. The base (bottom disk) shall be 230
27、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 Terminology D 1517 for definitions of terms) (
28、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.) diameter). Fill bag with shot and cover with two l
29、ayers 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 AssemblyE661033from the edge of the base. Two rows of stitching shall be usedfor the vertical sidewall seam and the seam attaching thesidewall to
30、 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 top ofthe wall. These holes shall be reinforced with
31、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 sidewall orfailure of the vertical seam, a sleeve, made fr
32、om 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 diameters of 1 to 3.5 mm (0.039 to 0.138 in.).Two layers o
33、f 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 before impact tests are conducted. Forspans greater
34、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 height of the bag.7. Test Specimens7.1 Select specim
35、ens 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 specified, the number of tests shall be such asto devel
36、op 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).7.2 Specimen Size:7.2.1 LengthThe specimen length
37、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 permitted orrecommended for the product used and its intende
38、d 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 areunsupported or partially supported, sheathing may be t
39、rimmedto 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 Conditioning of SheathingPrior to static and impacttest
40、ing, 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 or single-layer floor application both dry and in ar
41、e-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 moisture content or for at least 2 weeks, at 20 6 3C(68
42、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 water ponding on it, orimmersion of any portion.NOTE
43、 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 on blocks to elevate itslower edge above the residua
44、l 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 and 4, using the typeof framing, fastener schedule, a
45、nd 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 any species and grade commonly used in construction
46、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 damage the testing equipment. Framing may bereused for mo
47、re 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 (see Fig. 3).8.1.1 If the edge of the sheathing is
48、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 supported edge asshown in Fig. 3.TABLE 1 Drop Bag W
49、eights 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.E6610348.1.2 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 76-mm (3-in.) diameter loading disk.8.2.1 Apply the load continuou
