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1、ARTICLEINPRESSEngineeringStructures()ContentslistsavailableatScienceDirectEngineeringStructuresjournalhomepage:www.elsevier.com/locate/engstructUltimatestrainofstiffenedsteelboxsectionsunderbendingmomentandaxialforcefluctuationsOsmanTuncCetinkayaa,ShozoNakamurab,,KazuoTakahash
2、ibaNagasakiUniversityGraduateSchoolofScienceandTechnology,1-14,Bunkyo-machi,Nagasaki852-8521,JapanbNagasakiUniversity,DepartmentofCivilEngineering,1-14,Bunkyo-machi,Nagasaki852-8521,JapanarticleinfoabstractArticlehistory:Theinfluenceofaxialforcefluctuationsontheductilityofshorts
3、teelcylindershasbeenpreviouslyReceived13February2008reportedbytheauthors,togetherwithaproposalforadesignformulathattakesthisinfluenceintoReceivedinrevisedformaccount.Thepresentpaperdescribesasimilarinvestigationforstiffenedshortsteelboxcolumns.10November2008Elastoplasticlarge-di
4、splacementanalysisofparametricshortsteelboxcolumnsiscarriedoutandtheAccepted11November2008bendingbehaviorunderconstantandfluctuatingaxialforcesiscompared.ThemaximumvalueofaxialAvailableonlinexxxxforcefluctuationistakentobethesameastheaxialforcemagnitudeintheconstantaxialforcecas
5、e.Itisfoundthatductilecapacitycorrespondingtothepost-peakregionofthebendingbehaviorisimprovedtoKeywords:Stiffenedsteelboxcolumnsdifferentdegreesdependingonthemagnitudeandamountoffluctuationoftheaxialforce,afindingthatAxialforcefluctuationissimilartothatforshortsteelcylinders.Des
6、ignformulaeforfailurestraintakingthisimprovementintoElastoplasticlargedisplacementanalysisaccountareproposedfortwodifferentlimitstatesandtheirvalidityisdemonstratedthroughnumericalSeismicdesignanalysis.Steelbridges'2008ElsevierLtd.Allrightsreserved.1.Introductionthevalidityofthe
7、seformulaethroughacomparisonwithcyclicloadingtests.TheequationshavebeenslightlymodifiedbyGeThin-walledsteelboxsectionswithstiffenerplatesarewidelyetal.[18]toextendtheirapplicabilitytoawiderrangeofaxialforceusedinthebridgesofJapan'sroadnetwork,suchasinthemagnitudes.Theductilecapa
8、cityofstructuralcomponentscancantileverbridgepi
