Designation:D5977−15StandardSpecificationforHighLoadRotationalSphericalBearingsforBridgesandStructures1ThisstandardisissuedunderthefixeddesignationD5977;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoversbridgebearingsthatconsistofasphericalrotationalelement,whereastainlesssteelconvexsurfaceslidesagainstaconcavecarbonsteelplatecoveredwithwovenorsheetpolytetrafluoroethylene(PTFE).Thefunctionofthebearingistotransferloadsandtoaccommodateanyrelativemovement,includingrotationbetweenabridgesuper-structureanditssupportingstructure,orboth.1.2Thisspecificationcoverstherequirementsofsphericalbearingswithastandardhorizontalload(amaximumof10%ofvertical).1.3Therequirementsstatedinthisspecificationaretheminimanecessaryforthemanufactureofqualitybearingdevices.Itmaybenecessarytoincreasetheseminimumvaluesduetootherdesignconditions.1.4Thevaluesstatedininch-poundunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.5Thefollowingsafetyhazardscaveatpertainsonlytothetestmethodportion,Section7,ofthisspecification:Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimita-tionspriortouse.2.ReferencedDocuments2.1ASTMStandards:2A36/A36MSpecificationforCarbonStructuralSteelA167SpecificationforStainlessandHeat-ResistingChromium-NickelSteelPlate,Sheet,andStrip(With-drawn2014)3A240/A240MSpecificationforChromiumandChromium-NickelStainlessSteelPlate,Sheet,andStripforPressureVesselsandforGeneralApplicationsA572/A572MSpecificationforHigh-StrengthLow-AlloyColumbium-VanadiumStructuralSteelA588/A588MSpecificationforHigh-StrengthLow-AlloyStructuralSteel,upto50ksi[345MPa]Mini...
