Designation:D5457−21aStandardSpecificationforComputingReferenceResistanceofWood-BasedMaterialsandStructuralConnectionsforLoadandResistanceFactorDesign1ThisstandardisissuedunderthefixeddesignationD5457;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONLoadandresistancefactordesign(LRFD)isastructuraldesignmethodthatusesconceptsfromreliabilitytheoryandincorporatesthemintoaprocedureusablebythedesigncommunity.Thebasicdesignequationrequiresestablishingareferenceresistancebasedonseveralmaterialpropertyparameters.Astandardmethodforcalculatingtherequiredmaterialpropertyinputdataiscriticalsothatallwood-basedstructuralmaterialscanbetreatedequitably.ThisspecificationprovidestheproceduresthatarerequiredforthegenerationofreferenceresistanceforLRFD.1.Scope1.1Thisspecificationcoversproceduresforcomputingthereferenceresistanceofwood-basedmaterialsandstructuralconnectionsforuseinloadandresistancefactordesign(LRFD).TheformatconversionprocedureisoutlinedinSection4.Thetest-basedderivationprocedureisoutlinedinAnnexA1.Thereferenceresistancederivedfromthisspecifi-cationappliestothedesignofstructuresaddressedbytheloadcombinationsinASCE7-16.1.2AcommentarytothisspecificationisprovidedinAppendixX1.1.3Thevaluesstatedininch-poundunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesaremathemati-calconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D9TerminologyRelatingtoWoodandWood-BasedProd-uctsD143TestMethodsforSmallClea...
