2D Bridge Structure

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ME455/555IntrotoFiniteElementAnalysis Winter10 Abaqus/CAEVibrationstutorial

2010HormozZareh&JaysonMartinez 1 PortlandStateUniversity,MechanicalEngineering

Abaqus/CAE(ver.6.9)VibrationsTutorialProblemDescription

Thetwodimensionalbridgestructure,whichconsistsofsteelTsections,issimplysupportedatitslowercorners.

Determinethefirst10eigenvaluesandnaturalfrequencies.


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AnalysisSteps1. StartAbaqusandchoosetocreateanewmodeldatabase2. InthemodeltreedoubleclickonthePartsnode(orrightclickonpartsandselectCreate)

3. IntheCreatePartdialogbox(shownabove)namethepartanda. Select2DPlanarb. SelectDeformablec. SelectWired. Setapproximatesize=20e. ClickContinue

4. Createthegeometryshownbelow(notdiscussedhere)


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5. DoubleclickontheMaterialsnodeinthemodeltree

a. Namethenewmaterialandgiveitadescriptionb. ClickontheMechanicaltabElasticityElasticc. DefineYoungsModulusandPoissonsRatio(useSIunits)

i. WARNING: TherearenopredefinedsystemofunitswithinAbaqus,sotheuserisresponsibleforensuringthatthecorrectvaluesarespecified


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d. ClickontheGeneraltabDensitye. Density=7800f. ClickOK

6. DoubleclickontheProfilesnodeinthemodeltreea. NametheprofileandselectTfortheshape

i. NotethattheTshapeisoneofseveralpredefinedcrosssectionsb. ClickContinuec. Enterthevaluesfortheprofileshownbelowd. ClickOK

7. DoubleclickontheSectionsnodeinthemodeltreea. NamethesectionBeamPropertiesandselectBeamforboththecategoryandthetypeb. ClickContinuec. LeavethesectionintegrationsettoDuringAnalysisd. Selecttheprofilecreatedabove(TSection)e. Selectthematerialcreatedabove(Steel)f. ClickOK


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8. ExpandthePartsnodeinthemodeltree,expandthenodeofthepartjustcreated,anddoubleclickonSectionAssignments

a. Selecttheentiregeometryintheviewportb. Selectthesectioncreatedabove(BeamProperties)c. ClickOK

9. ExpandtheAssemblynodeinthemodeltreeandthendoubleclickonInstancesa. SelectDependentfortheinstancetypeb. ClickOK


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10.DoubleclickontheStepsnodeinthemodeltreea. Namethestep,settheproceduretoLinearperturbation,andselectFrequencyb. ClickContinuec. Givethestepadescriptiond. SelecttheradiobuttonValueunderNumberofeigenvaluesrequestedandenter 10e. ClickOK

11.DoubleclickontheBCsnodeinthemodeltreea. NametheboundaryconditionedPinnedandselectDisplacement/Rotationforthetypeb. ClickContinuec. SelectthelowerleftvertexofthegeometryandpressDoneinthepromptaread. ChecktheU1andU2displacementsandsetthemto0e. ClickOK

f. Repeatforthelowerrightvertex,butmodelarollerrestraint(onlyU2fixed)instead


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12. InthemodeltreedoubleclickonMeshfortheBridgepart,andinthetoolboxareaclickontheAssignElementTypeicon

a. SelectStandardforelementtypeb. SelectLinearforgeometricorderc. SelectBeamforfamilyd. Notethatthenameoftheelement(B21)anditsdescriptionaregivenbelowtheelementcontrolse. ClickOK

13. InthetoolboxareaclickontheSeedEdge:ByNumbericon(holddownicontobringuptheotheroptions)

a. SelecttheentiregeometryandclickDoneinthepromptareab. Definethenumberofelementsalongtheedgesas5

14. InthetoolboxareaclickontheMeshParticona. ClickYesinthepromptarea


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15. InthemenubarselectViewPartDisplayOptionsa. ChecktheRenderbeamprofilesoptionb. ClickOK

16.ChangetheModuletoPropertya. ClickontheAssignBeamOrientationiconb. Selecttheentiregeometryfromtheviewportc. ClickDoneinthepromptaread. Acceptthedefaultvalueoftheapproximaten1direction

17.Notethatthepreviewshowsthatthebeamcrosssectionsarenotallorientatedasdesired(seeProblemDescription)


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18. InthetoolboxareaclickontheAssignBeam/TrussTangenticona. Clickonthesectionsofthegeometrythatareoffby180degrees

19. InthemodeltreedoubleclickontheJobnodea. NamethejobBridgeb. ClickContinuec. Givethejobadescriptiond. ClickOK


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20. Inthemodeltreerightclickonthejobjustcreated(Bridge)andselectSubmita. WhileAbaqusissolvingtheproblemrightclickonthejobsubmitted(Bridge),andselectMonitor


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b. IntheMonitorwindowcheckthattherearenoerrorsorwarningsi. Ifthereareerrors,investigatethecause(s)beforeresolvingii. Iftherearewarnings,determineifthewarningsarerelevant,somewarningscanbesafely

ignored

21. Inthemodeltreerightclickonthesubmittedandsuccessfullycompletedjob(Bridge),andselectResults


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22. InthemenubarclickonViewportViewportAnnotationsOptionsa. UnchecktheShowcompassoptionb. ThelocationsofviewportitemscanbespecifiedonthecorrespondingtabintheViewportAnnotations

Options

c. ClickOK

23.Displaythedeformedcontouroverlaidwiththeundeformedgeometrya. Inthetoolboxareaclickonthefollowingicons

i. PlotContoursonDeformedShapeii. AllowMultiplePlotStatesiii. PlotUndeformedShape


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24. InthetoolboxareaclickontheCommonPlotOptionsicona. NotethattheDeformationScaleFactorcanbesetontheBasictabb. OntheLabelstabchecktheshownodesymbolsiconc. ClickOK


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25. InthemenubarclickonResultsStep/Framea. ChangethemodebydoubleclickingintheFrameportionofthewindowb. Observetheeigenvaluesandfrequenciesc. ClickOK


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26. InthetoolboxareaclickonAnimationOptionsa. ChangetheModetoSwingb. ClickOKc. AnimatebyclickingonAnimate: ScaleFactoriconinthetoolboxaread. Stoptheanimationbyclickingontheiconagain

27.ClickontheNextarrowonthecontextbartochangethemode

28.ExpandtheBridge.odbnodeintheresulttree,expandtheHistoryOutputnode,andrightclickonEigenfrequency:

a. SelectSaveAsb. Name=Frequencies


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c. RepeatforEigenvalued.

Observe

the

XYData

nodes

in

the

result

tree

29. InthemenubarclickonReportXY

a. Selectfrom=AllXYdatab. HighlightEigenvaluesc. ClickontheSetuptabd. ClickSelectandspecifythedesirednameandlocationofthereporte. ClickApplyf. ClickontheXYDatatabg. HighlightFrequenciesh. ClickOK


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2010 Hormoz Zareh & Jayson Martinez 17 Portland State University Mechanical Engineering

30.Openthereport(.rptfile)withanytexteditor

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2D Bridge Structure