简介：Themostcriticalissueinthesteelcatenaryriserdesignistoevaluatethefatiguedamageinthetouchdownzoneaccurately.Appropriatemodelingoftheriser-soilresistanceinthetouchdownzonecanleadtosignificantcostreductionbyoptimizingdesign.Thispaperpresentsaplasticitymodelthatcanbeappliedtonumericallysimulateriser-soilinteractionandevaluatedynamicresponsesandthefatiguedamageofasteelcatenaryriserinthetouchdownzone.Utilizingthemodel,numerousriser-soilelementsareattachedtothesteelcatenaryriserfiniteelements,inwhicheachsimulateslocalfoundationrestraintalongtherisertouchdownzone.Theriser-soilinteractionplasticitymodelaccountsforthebehaviorwithinanallowablecombinedloadingsurface.Themodelwillberepresentedinthispaper,allowingsimplenumericalimplementation.Moreimportantly,itcanbeincorporatedwithinthestructuralanalysisofasteelcatenaryriserwiththefiniteelementmethod.Theapplicabilityofthemodelisinterpretedtheoreticallyandtheresultsareshownthroughapplicationtoanoffshore8.625″steelcatenaryriserexample.Thefatigueanalysisresultsofthelinerelasticriser-soilmodelarealsoshown.Accordingtothecomparisonresultsofthetwomodels,thefatiguelifeanalysisresultsoftheplasticityframeworkarereasonableandthehorizontaleffectsoftheriser-soilinteractioncanbeincluded.

简介：Thescaleeffectleadstolargediscrepanciesbetweenthewakefieldsofmodel-scaleandactualships,andcausesdifferencesincavitationperformanceandexcitingforcestestsinpredictingtheperformanceofactualships.Therefore,whentestdatafromshipmodelsaredirectlyappliedtopredicttheperformanceofactualships,testresultsmustbesubjectedtoempiricalcorrections.Thisstudyproposesamethodforthereversedesignofthehullmodel.Comparedtoageometricallysimilarhullmodel,thewakefieldgeneratedbythemodifiedmodelisclosertothatofanactualship.Anon-geometricallysimilarmodelofaKoreanResearchInstituteofShipandOceanEngineering(KRISO)’scontainership(KCS)wasdesigned.Numericalsimulationswereperformedusingthismodel,anditsresultswerecomparedwithfull-scalecalculationresults.Thedeformationmethodofgettingthewakefieldoffull-scaleshipsbythenon-geometricallysimilarmodelisappliedtotheKCSsuccessfully.