7/30/2019 Rectangular Elastomer Bearing Design
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RECTANGULARELASTOMERBEARINGDESIGNPROGRAMSINSTRUCTIONS
ProgramsforthedesignofelastomerbearingswerecreatedbyVivanEngenhariaandwereextensivelytested.OtherwiseVivanEngenhariadonotassumesresponsibilitiesforvalidityresults.
VivanEngenhariainformstouserthatprogramisagivenfacilityandanadditionaltool.Butthefinalevaluationmustbebyengineerwhoisthedefinitivelyjudgewhenchoosingdimensionsofbearingsinverifications.
Theprogramutilizationdonotdispenseresultsverificationbythedesignengineer.
Wheredeflectionunderloadiscriticaltothedesignofstructure,ortothebearingfunction,thestiffnessofbearingshouldbeascertainedbytests.
Therearetwoprograms:oneforthedesignoflaminatedbearingsandotherforthedesignofplainpadbearing.InEnglishversion,program'sunitsare:stressesinMPa;forcesinkNanddimensionsinmm.Programsconsiderhorizontalloadsandrotationsinlongitudinaldirectionofstructure.
Programsaresubjectedtomodificationswithoutpreviousadvice.
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DESIGNHIPOTESISUSEDINPROGRAMS
LaminatedelastomerbearingsdesignprogramsconsiderEuronormstandardinstructions.Howtheresultsofbearingdeflectionsmaypresentsignificantvariations,rotationstabilityisverifiedadditionallybyUIC-CodeinstructionsandalsoadoptedbyBrazilianStandardNBR9062-1985.ThedesignofplainpadbearingsconsiderresultsofBrazilianexperience,complementedbyEN1337.UIC-CodeanCNR(ItalianStandard).
Programconsiderresolutionofonlyoneloadcondition.
Programsupposesonlypositiveverticaldeadloads,positiveresultantverticalloadsandpositivehorizontalloadsanddisplacements.
Rotationsaresupposedexactlywithsignalsasgivenbytheengineeringdesignresults.
Incaseofsumofrotationswithoppositesignalswithresultnearzero,itisrecommendedconsideravariationabout1,1inmajormodulusrotationand0,9inminormodulusrotation.
Thetoleranceforsurfacelevelingis0,003radforpre-frabicated(steelorconcrete)structuresand0,010forcastinplacestructures.Whenbearinginstallationerrorprevisionisgreaterthanallowabletolerance,wehavetoaddresidual
permanentrotation.Forexample,ifbearinginstallationprecisionprevisionunderaprecastedbearingis0,010rad,wehavetoconsideraresidualpermanentrotation,inthemostunfavorablesenseof0,010rad-0,003rad=0,007rad.
