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：Fatiguedesignmethodisusuallyusedforestimatingwhetheraplatformstructuremeetstherequirementsoffatigueresistance.ItisdescribedinAPIRP-2AandZCrulesforfixedoffshoreplatforms,inwhichtheallowablestressesforfatiguedesignaredefined.Inthispaperdiscussedaretheallowablestressesrelatedfactors,suchaswaveclimate,structuralresponse,fatiguebehaviourofstructuralmembers.

简介：Thispaperpresentsfatiguecharacteristicanalysisofadeepwatersteelcatenaryriser(SCR)underambientexcitations.TheSCRinvolvescomplexnonlineardynamicbehaviors,especiallyatthetouchdownpoint(TDP)wheretheriserfirsttouchestheseafloor.Owingtothesignificantinteractionwithsoil,thetouchdownzoneisdifficulttobemodeled.BasedonLumped-MassmethodandP-ycurve,nonlinearspringsareusedtosimulatetheSCR-seabedcoupledinteraction.Incasestudies,anSCR'sdynamicfeatureshavebeenobtainedbytransientanalysisandthestructurefatigueassessmenthasbeencarriedoutbyS-Napproach.ThecomparativeanalysisshowsthattheTDPisthekeylocationwheresoil-riserinteractionrisessteeplyandminimumfatiguelifeoccurs.Parameterssuchasoceanenvironmentloads,vesselmotions,risermaterialandgeometricparametersarediscussed.Theresultsindicatethatthevesselmotionistheprincipalfactorforthestructurefatiguelifedistribution.

简介：Afatiguelifeestimationmethodforoffshorestructuresunderrandomstressresponseisstudiedinthispaper.Themethodofbroadbandcumulativefrequencynumberisusedtodeterminetheeffectofbandwidthofstressfrequencyspectraonfatigue.AformulaofcorrectionfactorforfatigueunderbroadbandstressspectraissuggestedandcomparedwiththatgivenbyP.H.Wirsching.

简介：ThefatigueflexuralperformanceofRCbeamsattackedbysaltspraywasstudied.Atestingmethodinvolvingelectroosmosis,electricalacceleratedcorrosionandsaltspraywasproposed.Thiscorrosionprocessmethodeffectivelysimulatesreal-worldsaltsprayandfatigueloadingexertedbyRCcomponentsonseabridges.FourRCbeamsthathavedifferentstressamplitudesweretested.ItisfoundthatdeteriorationbycorrosionandfatigueloadingreducesthefatiguelifeoftheRCanddecreasestheabilityofdeformation.Thefatiguelifeanddeflectionabilitycouldbereducedbyincreasingthestressamplitudeandthecorrosiondurationtime.Thetestresultdemonstratesthatthisexperimentalmethodcancouplecorrosiondeteriorationandfatigueloadingreasonably.ThisproceduremaybeappliedtoevaluatethefatiguelifeandconcretedurabilityofRCcomponentslocatedinanaturalsaltsprayenvironment.

简介：在现在的学习，我们模仿了用有限元素方法和建议multiaxial的链状的起床人(SCR)使疲劳的深海的钢的卷躺安装过程为卷的SCR的分析。卷躺方法是最有效、节俭的管道安装方法之一。然而，卷的起床人的材料性质可以变化，特别在焊接地区，它能影响疲劳表演。适用的有限元素分析(FEA)，我们通过卷，aligner，和straightener模仿了安装负担历史并且分析了性质变化。焊接的影响在安装过程，穿入的缺乏和熔化的缺乏期间背叛，也被讨论。基于FEA结果，我们使用了与批评飞机途径相结合预言疲劳生活的棕色厂主的标准卷并且非卷的模型。结果显示一个焊接缺点在一个起床人，和卷躺方法的材料性质上有重要影响能显著地减少SCR的疲劳生活。分析结论能帮助设计者理解焊接的机械表演在期间卷躺安装。

简介：Inordertoresearchthestrengtheningeffectsofaramidfiberreinforcedpolymer(AFRP)sheetsontheflexuralperformanceofcorrodedreinforcedconcrete(RC)beams,thestaticandfatigueperformanceofcorrodedRCbeamsstrengthenedwithnon-prestressedAFRPsheetsunderdifferentdegreesofcorrosion(minor:reinforcementmasslossis2.0%,medium:reinforcementmasslossis6.0%)havebeenresearchedexperimentallyinthispaper,tocomparewiththatofthecontrolbeams(un-strengthenedandun-corroded)andun-strengthenedcorrodedbeams,andadditionallycomparewithfatigueperformanceofthosemediumcorrodedRCbeamsstrengthenedwithprestressedAFRPsheetswithpermanentanchors.Theresultsshowthat,(1)comparedwithun-strengthenedcorrodedbeamsunderthesamedegreesofcorrosion,thecracking,yieldandultimatemonotonicloadsoftheminorcorrodedRCbeamstrengthenedwithnon-prestressedAFRPsheetsisrespectivelyincreasedby20%,27%and60%,whereasforthemediumcorrodedRCbeamstrengthenedwithnon-prestressedAFRPsheetsincreasedby15%,36%and83%respectively.Theultimatedeflectionofthemediumcorrodedbeamstrengthenedwithnon-prestressedAFRPsheetsis166%largerthanthatofthecorrodedun-strengthenedbeamunderthemonotonicload.(2)Thefatiguelifeofthenon-prestressedAFRPstrengthenedmediumcorrodedbeamis10.4timesmorethanthatoftheun-strengthenedcorrodedbeam,butlowerthanthatoftheunstrengthened-uncorroded(virgin)beam.(3)FatigueexperimentsofthebeamsstrengthenedwithprestressedAFRPsheetsandwiththosenon-prestressedAFRPsheetsshowthatthefatiguelifeoftheretrofitRCbeamsincreasewithincreasingprestresslevelofAFRPsheets.(4)TheuseofAFRPsheetsforstrengtheningcorrodedRCbeamsisanefficienttechniquethatcanmaintainthestructuralintegrityandenhancethestructuralbehaviorofsuchbeams.

简介：-Withtherapiddevelopmentoftheoffshoreoilindustries,submarineoil/gaspipelineshavebeenwidelyused.Underthecomplicatedsubmarineenvironmentalconditions,thedynamiccharacteristicsofpipelinesshowsomenewfeaturesduetotheexistenceofbothinternalandexternalflows.Thepaperisintendedtoinvestigatethevortex-inducedvibrationofthesuspendedpipelinespanexposedtosubmarinesteadyflow.Especially,theeffectsoftheflowinsidethepipelinearetakenintoaccount.Itsinfluencesontheamplitudeofpipelineresponse,andthenonthefatiguelife,aregivenintermsofthevelocityoftheinternalflow.

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