Designation:D198−15StandardTestMethodsofStaticTestsofLumberinStructuralSizes1ThisstandardisissuedunderthefixeddesignationD198;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONNumerousevaluationsofstructuralmembersofsawnlumberhavebeenconductedinaccordancewithTestMethodsD198.Whiletheimportanceofcontinueduseofasatisfactorystandardshouldnotbeunderestimated,theoriginalstandard(1927)wasdesignedprimarilyforsawnlumbermaterial,suchasbridgestringersandjoists.Withtheadventofstructuralgluedlaminated(glulam)timbers,structuralcompositelumber,prefabricatedwoodI-joists,andevenreinforcedandprestressedtimbers,aprocedureadaptabletoawidervarietyofwoodstructuralmemberswasrequiredandTestMethodsD198hasbeencontinuouslyupdatedtoreflectmodernusage.Thepresentstandardprovidesameanstoevaluatetheflexure,compression,tension,andtorsionstrengthandstiffnessoflumberandwood-basedproductsinstructuralsizes.Aflexuraltesttoevaluatetheshearstiffnessisalsoprovided.Ingeneral,thegoaloftheD198testmethodsistoprovideareliableandrepeatablemeanstoconductlaboratoryteststoevaluatethemechanicalperformanceofwood-basedproducts.WhilemanyofthepropertiestestedusingthesemethodsmayalsobeevaluatedusingthefieldproceduresofTestMethodsD4761,themoredetailedD198testmethodsareintendedtoestablishpracticesthatpermitcorrelationofresultsfromdifferentsourcesthroughtheuseofmoreuniformprocedures.TheD198testmethodsareintendedforuseinscientificstudies,developmentofdesignvalues,qualityassurance,orotherinvestigationswhereamoreaccuratetestmethodisdesired.Provisionismadeforvaryingtheproceduretoaccountforspecialproblems.1.Scope1.1Thesetestmethodscovertheevaluationoflumberandwood-basedproductsinstructuralsizesbyvarioustestingprocedures.1.2Thetestmethodsappearinthefollowingorder:SectionsFlexure4–11Compression(ShortSpecimen)13...
