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1、TransactionsofTianjinUniversityVol.7No.4Dec.2001THEORETICALANALYSISANDEXPERIMENTALRESEARCHFORULTIMATELOAD2CARRYINGCAPACITYOFWEBPLATESOFÉ2SECTIONPLATEGIRDERSDINGYang,HANQing2hua,CHENGWan2hai(SchoolofConstructionalEngineering,TianjinUniversity,Tianjin300072,China)Abstract:Thepost2buckling
2、strengthofwebplateofI2sectionplategirdersisconsideredtoresisttheshearforceinmanyothercountries’codefordesignofsteelstructures,whileithasnotbeenconsid2eredintheChinesecodeGBJ17-88.Forthecoderevising,someimportantconclusionshavebeendrawnthroughthetheoreticalanalysisandexperimentalresearch
3、ofthepost2bucklingstrengthofwebplateofI2sectionplategirders.Keywords:I2sectionplategirders;webplate;post2bucklingstrengthXWherebucklingistakenasthebasisfordesignAccordingtothefundamentalsofthefiniteele2ofI2sectionplategirderwebplatesthemaximummentmethodofthenonlinearcurvedshell,finiteel
4、e2stressinthewebplates,computedbyconventionalmentequationshavebeensetuptoanalyzethelargebeamtheory,shouldnotexceedthebucklingstressdi2defection,largerotationandsmall2strainofthepost2videdbyafactorofsafety.ThewebplatesareoftenbucklingstrengthofwebplatesofI2sectionplategird2reinforcedwith
5、transversestiffeners,andoccasionallyerswithregardtothegeometryandmaterialnonlinearwithlongitudinalstiffeners,toincreaseitsresistanceandusingtheUpdatedLagrangianDescription(ULtobuckling,anddesigninvolvesfindingacombinationmethod).Thenthefiniteprogramhasbeenmadeusingofplatethicknesswithst
6、iffenerspacing,whichwillbethemodifiedNewton2RaphsonMethodandarclengtheconomicalinmaterialandfabrication.Tomaximizemethodanditsaccuracyhasbeenverifiedthroughthethestrengthöweightratioofaplategirder,thewebpresenttypicalexamples.platesareusuallydesignedthin2walled,advantageConsideringthere
7、alandpracticalprojectofI2sec2mustbetakenofthepost2bucklingcapacity.tionplategirdersandthroughtheoreticalcalculation,theinitialgeometricdefects,theresidualstress,thewebplateslendernessratio,therigidityofflange,the1TheoryAnalysisdesignofthelongitudinalandtransversestiffenersandth
