简介:First,Wirsching'smodel,whichiswidelyemployedinfatiguereliabilityanlysisofmarineandoffshorestructures,isanalysedsystematically.Itisfoundthattheveryimportantrandomvariable△inWirsching'smodelcannotbedirectlydeterminedfromfatigueexperimentbecauseoftheirreversibilityoffatiguetest,andinfact,whatWirschingstudiedfromtestingresultsisnot△butαofthestatisticalMiner'srule.Second,byuseofthestatisticalMiner'srule,amodifiedWirsching'smodelisproposed.Thirdlyandmoreimportantly,basedonthetwo-dimensionalprobabilisticMiner'srule,anewmodelisestablishedforfatiguereliabilityanalysisofstructuralcomponentssubjectedtospecifiedcyclicloadingofvariableamplitudeorstochastictimehistory.Intheend,anexampleispresented,fromwhichitwillbeseenthatthisnewmodelisveryconvenienttouseandfeasibletoengineeringpractice.
简介:Asimplifiedfatigue-lifemodelisproposedforassessingtheseismicinelasticrotationalcapacityofsteelconnections.Firstrelationsaredevelopedforrigidsteelconnectionsunderlateralloading.Nextthisisextendedtoaccountfortheeffectsoftheweldedsteelmomentframe(WSMF)connectionsoftheso-calledpre-Northridgetype.Theseismicfatiguetheoryisvalidatedagainstexperimentalresults.Theexperimentswereconductedunderincreasingductilityamplitudcsuntiltheonsetoffracture.Miner'rulewasusedtoconvertthetestresultstogivenanequivalentconstantamplitudecyclicfatiguelife.Satisfactoryagreementisobtainedwhencomparingtheexperimentalobservationswiththetheoreticalpredictions.
简介:Fatiguedesignmethodisusuallyusedforestimatingwhetheraplatformstructuremeetstherequirementsoffatigueresistance.ItisdescribedinAPIRP-2AandZCrulesforfixedoffshoreplatforms,inwhichtheallowablestressesforfatiguedesignaredefined.Inthispaperdiscussedaretheallowablestressesrelatedfactors,suchaswaveclimate,structuralresponse,fatiguebehaviourofstructuralmembers.
简介:Afatiguelifeestimationmethodforoffshorestructuresunderrandomstressresponseisstudiedinthispaper.Themethodofbroadbandcumulativefrequencynumberisusedtodeterminetheeffectofbandwidthofstressfrequencyspectraonfatigue.AformulaofcorrectionfactorforfatigueunderbroadbandstressspectraissuggestedandcomparedwiththatgivenbyP.H.Wirsching.
简介:-Withtherapiddevelopmentoftheoffshoreoilindustries,submarineoil/gaspipelineshavebeenwidelyused.Underthecomplicatedsubmarineenvironmentalconditions,thedynamiccharacteristicsofpipelinesshowsomenewfeaturesduetotheexistenceofbothinternalandexternalflows.Thepaperisintendedtoinvestigatethevortex-inducedvibrationofthesuspendedpipelinespanexposedtosubmarinesteadyflow.Especially,theeffectsoftheflowinsidethepipelinearetakenintoaccount.Itsinfluencesontheamplitudeofpipelineresponse,andthenonthefatiguelife,aregivenintermsofthevelocityoftheinternalflow.
简介:Full-rangenonlinearanalysisoffatiguebehaviorsofreinforcedconcretestructuresbyfiniteelementmethod¥SongYupu;ZhaoShunbo;WangRuim...