Designation:D7914/D7914M−21StandardTestMethodforStrengthofFiberReinforcedPolymer(FRP)BentBarsinBendLocations1ThisstandardisissuedunderthefixeddesignationD7914/D7914M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddeterminesthequasi-staticultimatestrengthoffiberreinforcedpolymer(FRP)compositebentbarscommonlyusedasanchoragesforstirrupsinreinforced,prestressed,orpost-tensionedconcretestructures.Thistestmethodonlyappliestobarswithasolidcrosssection.1.2FRPbentbarsareoftenusedinreinforcedconcreteapplicationstoshortenthedevelopmentlengthofthebarortoactasatieorastirruptoresistshearforces.Bentbarscanbeproducedwithvaryinganglesofbendinordertofittheirintendedpurpose.1.3Forthistestmethod,theFRPbarsarebentata90degreeangle.Ingeneral,barshavearegularpatternofsurfaceundulations,acoatingofbondedparticles,orboth,thatpromotemechanicalinterlockbetweenthebarandconcrete.1.4Thistestmethodmaybecompletedonstandardizedbars,producedaccordingtoSpecificationD7957/D7957M.Inthiscase,thenominalcross-sectionalareasandeffectivediametersaretakenfromD7957/D7957M.Thistestmethodmayalsobeusedforbarsthatarenotstandardized.Inthiscase,thecross-sectionalareasandeffectivediametersshouldbemeasuredandcalculatedasdescribedinTestMethodD7205/D7205M.1.5Thestrengthvaluesprovidedbythismethodareshort-term,quasi-statictensilestrengthsthatdonotaccountforsustainedstaticorcyclicloading.Ifbarsaretobeusedunderhighlevelsofsustainedorrepeatedloading,additionalmaterialcharacterizationmayberequired.1.6Thecharacteristicvaluesobtainedfromthistestmethodareintendedtorepresentthequasi-staticultimatestrengthofFRPbentbarswithataillengthoftwelvebardiameters.1.7Units—ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemarenotnecessarilyexactequiv...
