Designation:D2899−12(Reapproved2017)StandardPracticeforEstablishingAllowableStressesforRoundTimberPiles1ThisstandardisissuedunderthefixeddesignationD2899;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecontainsproceduresforestablishingallow-ablestressesforroundtimberpilesstartingwithclearwoodstrengthproperties.1.2Stressesestablishedunderthispracticeareapplicabletopilesconformingtothequality,straightness,spiralgrain,knot,check,shake,andsplitprovisionsofSpecificationD25.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D25SpecificationforRoundTimberPilesD245PracticeforEstablishingStructuralGradesandRe-latedAllowablePropertiesforVisuallyGradedLumberD2555PracticeforEstablishingClearWoodStrengthValues3.Terminology3.1Definitions:3.1.1allowablestress—thenumericvalueofpilestrengththatisappropriateforuseinstructuralanalysis.3.1.2end-bearing—compression-parallel-to-the-grainstressresultingwhenpileloadisnotcarriedtothesoilthroughskinfriction.3.1.3loadsharing—thedistributionofloadinproportiontopilestiffness.Thisresultsinpilesthatperformasagroupreducingeffectsofbetween-pilevariabilityandincreasingsystemreliabilityoverthatofpileswhichperformindepen-dently.3.1.4skinfriction—theinteractionbetweenthepilesurfaceandthesoilwhichse...
