1、Designation:D576497a(Reapproved 2013)Standard Test Method forEvaluating Dowel-Bearing Strength of Wood and Wood-Based Products1This standard is issued under the fixed designation D5764;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,
2、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.1.Scope1.1 This test method provides the basic procedure forevaluating dowel-bearing strength of wood and wood-basedproduc
3、ts.The bearing test results are used to determine thestatic load resistance and deformation characteristics of con-nections in wood and wood-base products resulting from theapplication of a load transmitted by a fastener inserted into apredrilled hole,or driven without drilling.Methods are givenfor
4、preparing specimens with predrilled holes larger than thefastener diameter and specimens with holes produced byinserting fasteners in holes smaller than the fastener diameter.The methods apply to fasteners such as dowels,bolts,nails,spikes,drift pins,screws,lag screws,and staples.1.2 This test metho
5、d also provides the basis for determiningthe compression behavior of wood products beneath a laterallyloaded fastener where the thickness of the product and thediameter of the fastener are such that minimal bending of thefastener occurs during testing.1.3 This standard does not purport to address al
6、l 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 Standards:2D143 Test Methods for Sm
7、all Clear Specimens of TimberD2395 Test Methods for Density and Specific Gravity(Rela-tive Density)of Wood and Wood-Based MaterialsD2915 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-Ba
8、se MaterialsE4 Practices for Force Verification of Testing Machines3.Terminology3.1 Definitions:3.1.1 dowel-bearing behaviorthe load-deformation be-havior of wood or wood-base products laterally loaded by afastener where the fastener does not bend during loading.3.1.2 dowel-bearing strengthyield loa
9、d obtained from theload-deformation curve of a dowel-bearing test divided by thedowel diameter and specimen thickness.4.Summary of Test Method4.1 Specimens consisting of a single rectangular parallele-piped member with a fastener hole perpendicular to the faces ofthe member are evaluated for the res
10、istance to embedding thefastener into the fastener hole,so as not to bend the fastener.Tests are conducted on a testing machine at a uniformdeformation rate,while loads and deformation are measured atvarious intervals.Supplementary physical properties of thewood or wood-base member are also determin
11、ed.5.Significance and Use5.1 The localized crushing behavior of wood or wood-baseproducts beneath a fastener where the fastener does not bendprovides a material property that is used in theoretical modelsfor connections where crushing or fastener bending,or both,occur.These theoretical models are us
12、ed to establish designvalues for wood and wood-base connections.The tests areappropriate when studying the effects of such variables asfastener diameter,fastener hole size,moisture content,specificgravity,and grain direction on the dowel-bearing strength.6.Apparatus6.1 Testing MachineAny suitable te
13、sting machine capableof operation at a constant rate of motion of its movable headand having an accuracy of 61%when calibrated in accor-dance with Practices E4.6.2 Deformation GageA deformation-measuring device,with a least reading of 0.001 in.(0.025 mm)for measuring themovement of the fastener into
14、 the wood or wood-base speci-men.1This test method is under the jurisdiction of ASTM Committee D07 on Woodand is the direct responsibility of Subcommittee D07.05 on Wood Assemblies.Current edition approved April 1,2013.Published April 2013.Originallyapproved in 1995.Last previous edition approved in
15、 2007 as D5764 97a(2007).DOI:10.1520/D5764-97AR13.2For 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.Copyright ASTM I
16、nternational,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 7.Sampling7.1 Sampling shall provide for selection of representativetest specimens which are appropriate to the objectives of thetesting program.7.2 Sample size shall be estimated using procedures inPractice D2915.NOTE1The precision required,the manner of sampling,and thenumber of tests will depend upon the specific test objectives.Generalexperience indicates that the coefficient of variation from embed
