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1、StabilityandDuctilityofSteelStructures(SDSS'99)D.Dubina&M.Ivany(editors)ElsevierSciencePub.Pages317-324Influenceofresidualstressonthecarrying-capacityofsteelframedstructures.NumericalinvestigationG.M.BarsanandC.G.ChioreanFacultyofCivilEngineering,TechnicalUniversityofCluj,340
2、0Cluj-Napoca,RomaniaABSTRACTInordertoassessexplicitlytheinfluenceofresidualstressesontheinelasticbehaviorofthesteelframesanewcomputerprogramNILDFA(Non-linearInelasticLargeDeflectionFrameAnalysis)waselaboratedbytheauthors.Thestatesofstrain,stressandyieldstressaremonitoredexpli
3、citlyduringeachstepoftheanalysisandtheeffectsofresidualstressesareaccuratelyincludedintheanalysis.Threeresidualstresspatterns,constant,linearandparabolicdistributionhasbeenconsideredforthreetypesofcalibrationframes:aportalframe,asix-storytwo-bayframeandatwo-storyframe.Thenume
4、ricaltestsandthecomparisonsmadeprovedtheeffectivenessoftheproposedanalysismethod.KEYWORDSResidualstress,materialimperfection,advancedanalysis,steelframes,inelasticanalysis,semi-rigidframes,large-deflectionanalysis.INTRODUCTIONAnupcomingtechnologyforlimit-statesdesign,termedad
5、vancedanalysis,isdefinedasanymethodofanalysisthatsufficientlyrepresentsthestrengthandstabilitybehavior,suchthatspecificationmembercapacityisnotrequired(Chen&Toma,1994).Thereasonforthisisthat,sinceadvancedanalysiscandirectlyassessthestrengthandstabilityoftheoverallstructuralsy
6、stemaswellasinterdependenceofmemberandsystemstrengthandstability,separatemembercapacitychecksarenotrequired.Aplastic-zoneanalysisthatincludesthespreadofplasticity,residualstresses,initialgeometricimperfections,andanyothersecond-orderbehavioraleffects,wouldcertainlybesuitablet
7、obeclassifiedasadvancedinelasticanalysisinwhichthecheckingofbeam-columninteractionisnotrequired.Anefficientobject-orientedTurbo-PascalcomputerprogramNEFCADforlargedeflectionelasto-plasticanalysisofsemi-rigidsteelframes,intheplastic-zoneapproachhasbeendevelopedrecently,bytheau
8、thors(Barsan&Chiorean,1999).Inthisapproach,thegradualplastificationo
