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第二章浮式結(jié)構(gòu)強(qiáng)度分析

Strength

Analysis

ofFloatingStructure

第三節(jié)有限元分析

FiniteElementAnalysis

閆發(fā)鎖

ApplicationofFEAinFloatingStructureFEAisthemajortoolforfloatingstructuredesignFEAmodelingconsiderationsDesigninputsfromFEAStructureFiniteElementAnalysisExperienceisthekeyinfloatingstructuredesignFEAisthemajortoolusedinsupportingandverifyingthedesignFEAusedinglobalanalysisFEAusedinallmajorconnectionsFEAusedinalllocalframingstructuresFEAusedinareaswherethestressflowiscomplicateModelingandAnalysisConsiderationsPlateelementsv.s.beamelements(sticks)Coarsemodelv.s.finemodel(elementnumbers)DetailsofconnectionsTendonstiffness,mooringstiffnessRiserloadsandstifnessTimedomainv.s.frequencydomainDesignwavev.s.spectralapproachElementSelectionBeamelementsLessCPUtimeEasytomodelNolocalstressvariationswithinelementBeamwithcenterlineoffsetPlateelementsFlatquadrilateralortriangularplatebendingelementsMoretechnicaltomodelCurvedshellelementsnotrequiredforcurvatureslessthan15degreesAspectratioslessthan3:1forrectangularIncludedangleslessthan135degreesfortriangularElementSelection(cont.)SolidelementsDifficulttomodelLargeCPUtimerequiredRequiredforthru-thicknessstressvariationRequiredforbearingloadtransferMeshSizeStrengthMeshsizeisafunctionofgeometryandloadsMustcapturestressgradientduetostructuregeometryShouldnotincludelocalgeometrichotspotstressesUsecoarsemeshawayfromintersectionandappliedlaodsUsefinermeshnearintersectionsandloadsMeshSize(cont.)BucklingCanusecoarsermeshthanforstrengthWanttocapturepanelstressesonamoreglobalscaleFatigueNeedveryfinemeshforhotspotstressapproachNeedstrengthtypemeshfornominalstressapproachFEAStressConsiderationsAveragedv.s.Non-AveragedStressesMeshsizeconsiderationsGeometryconsiderationsStrengthdesign–generallyusenon-averagedBucklingdesign–alwaysuseaveragedFatiguedesign–dependsonapproachVonMisesv.s.ComponentStressesStrengthdesign–generallyusevonMisesBucklingdesign–usecomponentFatiguedesign–usecomponentDesignInputsfromFEAFEAresultsareusedfordesignGlobalstabilityischeckedwithFEAresultsMajorconnectionsarecheckedwithFEAresultsFramingendterminations/transitionsarecheckedwithFEAresultsFatiguelifeischeckedwithFEAresultsIfthestructuralmembersizesarechangedbasedonFEAresults,FEAneedstobeupdatedAtconnectionends,ifthestresslevelistoohigh,finiteelementsmayneedtoberemeshedforfurtheranalysisTypicalDesignProceduresGlobalResponseDesignOverallStructuralDesignStructuralStrengthDesignStructuralSpectralFatigueDesignStructuralStabilityDesignAnalysisProcedureOverviewGlobalAnalysisProcedureStructuralStrengthDesignOperationconditionandextremeconditionIntactcasesanddamagecasesIn-placeconditionandpre-

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