2011ANSYS,Inc. September6,20111
SeismicAnalysisofOverheadCranesforNuclearIndustry
KPugazhendhi (KP)Konecranes NuclearEquipment&ServicesLLC
2011ANSYS,Inc. September6,20112
WhoWeAre?
OurProducts
OverviewofSeismicAnalysis
CaseStudy 1(CoupledBuilding/CraneSeismicAnalysis)
CaseStudy 2(TimeHistorySeismicAnalysis)
TableofContents
2011ANSYS,Inc. September6,20113
Konecranes LeadingLiftingEquipmentManufacturer
SuperSafesinglefailureproofcranes Polarcranes, Overheadfuelhandlingcranes Turbinemaintenancecranes Gantrycranes Remotelyoperatedtoprunningcranes Jibcranes Casktransfermachines
QA NUREG0554 NUREG0612 ASMENOG1 ASMENUM1
Moreonwww.konecranes.com
WhoWeAre
2011ANSYS,Inc. September6,20114
FiniteElementModeling
ModalAnalysis
LinearResponseSpectrumAnalysis
TimeHistoryAnalysis
FiniteElementAnalysisofOverheadCranes
2011ANSYS,Inc. September6,20115
Asimplifiedmodelwithonlybeamelementsforbridge/trolley
Globalfrequencies
Usefulattheconceptualdesignphase
Notveryusefulfortrolleystressanalysisduringseismicexcitation
SimplifiedFiniteElementModel
2011ANSYS,Inc. September6,20116
Bridge
BEAM188 Warping
LateralTorsional Buckling
Rope
COMBIN14 SimplePendulum
Trolley
SHELL181
DetailedFiniteElementModeling
~100,000D.O.F
2011ANSYS,Inc. September6,20117
NaturalFrequencies(033Hz)
MassParticipationFactors(>90%)
Requiredforresponsespectrumanalysisandtimehistoryanalysis
Coupledwithbuildingordecoupledfrombuilding
IfRm
2011ANSYS,Inc. September6,20118
SeismicAnalysis
ResponseSpectrumAnalysis Linear RequiresFrequencyvs.Acceleration MaximumResponse ComputationallyEfficient
TimeHistoryAnalysis CanbeNonlinear RequiresTimevs.Acceleration TimeConsuming Accurate
2011ANSYS,Inc. September6,20119
InputExcitation
Curveoffrequencyvs.acceleration
TypicallyAccelerationSpectrum
Threecurves(EW,NSandVertical)
Variouscurvesfordifferentdamping
OperationalBasisEarthquake(OBE)SafeShutdownEarthquake(SSE)
CraneRailLevelfordecoupled
AccelerationSpectrum
AccelerationTimeHistory
2011ANSYS,Inc. September6,201110
LinearResponseSpectrumAnalysis
PerformModalAnalysis Noneedtoexpandmodes
PerformSPRSAnalysis InputSpectrum ExcitationDirection MissingMass
ExpandModes ExpandmodeswithsignificantModeParticipationFactors
CombineModes Modescombinedbasedonthemodalcoefficientstogettotalresponse SRSS/Groupingetc.,methods
0
0.5
1
0.1 1 10 100ResponseSpectrum
2011ANSYS,Inc. September6,201111
TotalResponse
Resultstobecombined ResponseofthestructureduetoStaticLoad ResponseofthestructureduetoEWExcitation ResponseofthestructureduetoNSExcitation ResponseofthestructureduetoVerticalExcitation
TotalResponse
isthestaticstress j istheseismicstressobtainedduetoexcitationindirectionj
whe
2011ANSYS,Inc. September6,201112
TotalResponse Contd.whe
2011ANSYS,Inc. September6,201113
BatchExecution
Numberofanalysisismore 5BridgePositions,5TrolleyPositions,3HookPositions,3Directionsand2Excitations
450analyses.Nottoforgetthetotalresponsecomputation.
ANSYSsupportsTcl/Tk scripting Setupthedbfiles Setupthespectrummacros Identifytheoutputlocation
whe
2011ANSYS,Inc. September6,201114
BatchExecution Contd.whe
2011ANSYS,Inc. September6,201115
PostProcessing StressPlotswhe
StressPlot TrolleyStressPlot Bridge
2011ANSYS,Inc. September6,201116
PostProcessing MassParticipationFactorswhe
2011ANSYS,Inc. September6,201117
PostProcessing WheelLoadswhe
...
2011ANSYS,Inc. September6,201118
PostProcessing Accelerations
EvaluationofTrolleyandBridgeMountedComponents
Accelerations(intermsofG)
AccelerationPlot
2011ANSYS,Inc. September6,201119
TimeHistoryAnalysis
CreatelargemassattheBC Typically(M=MassX1E6)
PerformModalAnalysis Comparethefrequencies(1,2)
Timehistoryanalysis Modesuperposition Damping Integrationtimestep Transienteffects ApplyForceatthebase(GXM) Iftheexcitationsarenotstatisticallyindependent,cannotcombinetheinputacceleration
Expandresults
2011ANSYS,Inc. September6,201120
Animations ComparingFrequencies
2011ANSYS,Inc. September6,201121
PostProcessing
Scanthrougheachtimestep
Identifythemaximumstressinaparticularnodeforaparticularexcitation
Performstep2forallnodesand3excitations
Combinethemaximumvalueidentifiedforeachnode.
Addtheseismicresultswiththestaticsolution.
2011ANSYS,Inc. September6,201122
PostProcessing Comparison
ComparisononTimeHistory(TH)andResponseSpectrum(RS)stressresults
2011ANSYS,Inc. September6,201123
Summary
Boththeresponsespectrumandtimehistoryanalysisresultsarecomparable
Largemodelsforseveralloadcasesaresuccessfullyanalyzedforseismicconditions
Tcl/Tk interactionwithANSYShelpsinmanagingtheloadcasesefficiently
Loadcombinationhelpsinmanagingtheresultsfilesize
