Designation:C1812/C1812M−15´1StandardPracticeforDesignofJournalBearingSupportstobeUsedinFiberReinforcedConcreteBeamTests1ThisstandardisissuedunderthefixeddesignationC1812/C1812M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—ThedesignationwascorrectededitoriallyinJune2016toconformwiththeunitsstatement(1.2).1.Scope1.1Thispracticeprescribesthedesignofjournal-bearingtyperollerstosupporteachendoffiber-reinforcedconcretebeamstestedusingTestMethodC1399/C1399MorTestMethodC1609/C1609M.Therollerdesignisintendedtoprovideaconsistentandrelativelylowvalueofeffectivecoefficientoffrictionatthebeamsupports.Thebearingdesignincorporatesmetal-on-metalslidingsurfaceslubricatedwithgrease.NOTE1—Duringtheprogressofatest,acrackorcracksopenontheundersideofthebeambetweentheloadedthirdpointscausingtheundersideofeachportionofthebeamtomoveawayfromthecenter.Thedesignisintendedtoprovideforunlimitedrotationoftherolleratthepointofcontactwiththetestbeaminresponsetothismotion.NOTE2—Thedesignofthesupportingrollersisasignificantfactorindeterminingthemagnitudeofthearchingforcesthatcauseerrorinflexuraltestresults.2Improperlydesignedsupportingrollerscaninfluencetheapparentflexuralbehavioroffiber-reinforcedconcretebeams.3TheeffectivecoefficientoffrictioncanbedeterminedusingamethodsimilartothatdescribedbyBernard.41.2Units—ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilit...
