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英语翻译 第一篇：英语翻译378STSRUCTURALWALLS（b）geometricmodelingforcantileverwallsitwillbesufficienttoassumethatthesectionalpropertiesareconcentratedintheverticalcenterlineofthewall.Thisshouldbetakentopassthroughthecentroidalaxisofthewallsection,consistingofthegrossconcreteareaonly.Whencantileverwallsareinterconnectedateachfloorbyaslab,itisnormallysufficienttoassumethatthefloorwillactasarigiddiaphragm.Effectsofhorizontaldiaphragmflexibilityarediscussedbrieflyinsection6.5.3.Byneglectingwallsheardeformationsandthoseduetotorsionandtheeffectsofrestrainedwarpingofanopenwallsectiononstiffness,thelateralforceanalysiscanbereducedtothatofasetofcantileversinwhichflexuraldistortionsonlywillcontrolthecompatibilityofdeformations.Suchanalysis,basedonfirstprinciples,canallowfortheapproximatecontributionofeachwallwhenitissubjectedtodeformationsduetofloortranslationsandtorsion,asshowninsection.itmightbe,willsatisfytherequirementsofstaticequilibrium,andhenceitshouldleadtoasatisfactorydistributionalsoofinternalactionsamongthewallsofaninelasticstructure.Whentwoormorewallsinthesameplaneareinterconnectedbybeams,asisthecaseincoupledwallsshowninfigs.5.11and5.12,intheestimationofstiffnesses,itwillbenecessarytoaccountformorerigidendzoneswherebeamsframeintowalls.Suchstructuresareusuallymodeledasshowninfig.5.14.standardprogramswrittenforframeanalysesmaythenbeused.Itisemphasizedagainthattheaccuracyofgeometricstiffnessmodelingmayvaryconsiderably.Thisisparticularlytruefordeepmemberedstructures,suchasshowninfig.5.14.incoupledwalls,forexample,axialdeformationsmaybesignificant,andtheseaffecttheefficiencyofsheartransferacrossthecouplingsystem.Itisdifficulttomodelaccuratelyaxialdeformationsindeepmembersaftertheonsetofflexuralcracking.Figure5.15illustratesthedifficultiesthatarise.Structuralpropertiesareconventionallyconcentratedatthereferenceaxisofthewall,andhencewallframes.Undertheactionofflexureonly,rotationaboutthecentroidofthegrossconcretesectionispredicted,asshowninFig.5.15,byline1.Afterflexuralcracking,thes
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