abaqus帮助文档之地震相应计算分析报告

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1、实用标准文案2.1.15 SeismicanalysisofaconcretegravitydamProducts: Abaqus/Standard  Abaqus/ExplicitInthisexampleweconsiderananalysisoftheKoynadam,whichwassubjectedtoanearthquakeofmagnitude6.5ontheRichterscaleonDecember11,1967.Theexampleillustratesatypicalapplicationoftheconcretedamage

2、dplasticitymaterialmodelfortheassessmentofthestructuralstabilityanddamageofconcretestructuressubjectedtoarbitraryloading.Thisproblemischosenbecauseithasbeenextensivelyanalyzedbyanumberofinvestigators,includingChopraandChakrabarti (1973),BhattacharjeeandLéger (1993),GhribandTin

3、awi (1995),Cerveraetal. (1996),andLeeandFenves (1998).ProblemdescriptionThegeometryofatypicalnon-overflowmonolithoftheKoynadamisillustratedin Figure2.1.15–1.Themonolithis103 mhighand71 mwideatitsbase.Theupstreamwallofthemonolithisassumedtobestraightandvertical,whichisslightlyd

4、ifferentfromtherealconfiguration.Thedepthofthereservoiratthetimeoftheearthquakeis  =91.75 m.Followingtheworkofotherinvestigators,weconsideratwo-dimensionalanalysisofthenon-overflowmonolithassumingplanestressconditions.Thefiniteelementmeshusedfortheanalysisisshownin Figure2.1.1

5、5–2.Itconsistsof760first-order,reduced-integration,planestresselements(CPS4R).Nodaldefinitionsarereferredtoaglobalrectangularcoordinatesystemcenteredatthelowerleftcornerofthedam,withthevertical y-axispointingintheupwarddirectionandthehorizontal x-axispointinginthedownstreamdir

6、ection.ThetransverseandverticalcomponentsofthegroundaccelerationsrecordedduringtheKoynaearthquakeareshownin Figure2.1.15–3 (unitsof g =9.81 m sec–2).Priortotheearthquakeexcitation,thedamissubjectedtogravityloadingduetoitsself-weightandtothehydrostaticpressureofthereservoironth

7、eupstreamwall.Forthepurposeofthisexampleweneglectthedam–foundationinteractionsbyassumingthatthefoundationisrigid.Thedam–reservoirdynamicinteractionsresultingfromthetransversecomponentofgroundmotioncanbemodeledinasimpleformusingtheWestergaardaddedmasstechnique.AccordingtoWester

8、gaard(1933),thehydrodynamicpressuresthatthewaterexertsontheda