DNV-RP-C203-2001-Fatigue-Strength-Analysis-of-Offs

RECOMMENDEDPRACTICERP-C203FATIGUESTRENGTHANALYSISOFOFFSHORESTEELSTRUCTURESOCTOBER2001DETNORSKEVERITASCommentsmaybesentbye-mailtoUXOHV#GQYFRPForsubscriptionordersorinformationaboutsubscriptionterms,pleaseuseGLVWULEXWLRQ#GQYFRPComprehensiveinformationaboutDNVservices,researchandpublicationscanbefoundatKWWS://øvik,Norway;Tel[phone],Fax[phone].©DetNorskeVeritas.Allrightsreserved.Nopartofthispublicationmaybereproducedortransmittedinanyformorbyanymeans,includingphotocopyingandrecording,withoutthepriorwrittenconsentofDetNorskeVeritas.ComputerTypesettingbyDetNorskeVeritas.PrintedinNorwaybyGCSAS.IfanypersonsufferslossordamagewhichisprovedtohavebeencausedbyanynegligentactoromissionofDetNorskeVeritas,thenDetNorskeVeritasshallpaycompensationtosuchpersonforhisproveddirectlossordamage.However,thecompensationshallnotexceedanamountequaltotentimesthefeechargedfortheserviceinquestion,providedthatthemaximumcompensationshallneverexceedUSD2million.Inthisprovision“DetNorskeVeritas”shallmeantheFoundationDetNorskeVeritasaswellasallitssubsidiaries,directors,officers,employees,agentsandanyotheractingonbehalfofDetNorskeVeritas.

DETNORSKEVERITAS(DNV)isanautonomousandindependentfoundationwiththeobjectivesofsafeguardinglife,prop-ertyandtheenvironment,atseaandonshore.DNVundertakesclassification,certification,andotherverificationandconsultancyservicesrelatingtoqualityofships,offshoreunitsandinstallations,andonshoreindustriesworld-wide,andcarriesoutresearchinrelationtothesefunctions.DNVOffshorepublicationsconsistofathreelevelhierarchyofdocuments:
  ProvideprinciplesandproceduresofDNVclassification,certification,verificationandcon-sultancyservices.
 ProvidetechnicalprovisionsandacceptancecriteriaforgeneralusebytheoffshoreindustryaswellasthetechnicalbasisforDNVoffshoreservices.ProvideproventechnologyandsoundengineeringpracticeaswellasguidanceforthehigherlevelOffshoreServiceSpecificationsandOffshoreStandards.DNVOffshorepublicationsareofferedwithinthefollowingareas:A)QualityandSafetyMethodologyB)MaterialsTechnologyC)StructuresD)SystemsE)SpecialFacilitiesF)PipelinesandRisersG)AssetOperationThisRecommendedPracticeisdevelopedincloseco-operationwiththeoffshoreindustry,researchinstitutesanduniversities.Allcontributionsarehighlyappreciated.Followingmainchangesaremade:InthecalculationofSCFsforbuttweldsandcruciformjointsthemisalignmentmaybereuducedwithavalueδ0whichareinherentintheS-Ndata.SeeSection2.6,2.8.7and2.12.Calculationofreducedhotspotstresswhenweldprofilingisperformed,equation(4.2.3).
!! #$%
$&'DETNORSKEVERITAS'$!($%)1.1General..................................................................41.2Validityofstandard...............................................41.3Methodsforfatigueanalysis..................................41.4Guidancetowhenadetailedfatigueanalysiscanbeomitted....................................................................41.5Symbols.................................................................4#$%*(#+,-%-.#-!#$%*(-$-/2.1Introduction...........................................................62.2Stressestobeconsidered.......................................62.3S-Ncurves.............................................................72.4Meanstressinfluencefornonweldedstructures.122.5Effectoffabricationtolerances............................122.6Stressconcentrationfactorsforplatedstructures132.7Stressconcentrationfactorsforshipdetails........152.8Stressconcentrationfactorsfortubularjointsandmembers................................................................152.9Stressconcentrationfactorsforjointswithsquaresections..................................................................222.10Filletandpartialpenetrationwelds......................222.11Bolts.....................................................................242.12Pipelines...............................................................242.13Calculationofhotspotstressbyfiniteelementanalysis..................................................................252.14Simplifiedfatigueanalysis...................................28#$%*(##+,-%-&#-!0#$(1#%-3.1Introduction..........................................................32)23$0#$%*(%0&,#&%#$%4.1General.................................................................334.2Weldprofilingbymachiningandgrinding..........334.3Grinding...............................................................334.4TIGdressing.........................................................344.5Hammerpeening..................................................3445$!!0#$%*(+%04/$#$%-%#$%*(%0 !%%$/6.1General...............................