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1、TransactionsofTianjinUniversityVol.6No.1May2000SIMPLIFIEDANALYSISMETHODFORULTIMATELOAD*CAPACITYOFWEBPLATESOFBOXGIRDERSHANQing-hua,CHENGWan-hai,YINYue,LIUXi-liang(SchoolofConstructionalEngineering,TianjinUniversity,Tianjin300072,China)Abstract:Theprosperouspost-b
2、ucklingloadcapacityofwebplatesofboxgirderscanbeused.Inthisarticle,thepost-bucklingbehaviourofwebplatesofboxgirdersunderdifferentloadingconditionsistheoreticallyanalyzedandonthebasisofdomesticandoverseasdesigncodesofsteelstructures,thecorrespondingsimplifiedanaly
3、sismethodsareputforwardfortheengineeringdesignorcoderevision.Itisprovedthatthesimplifiedmethodsaresafe,efficientandpracticablethroughthecomparisonbetweenseveralresults.Keywords:post-bucklingbehaviour;ultimateloadcapacity;simplifiedanalysismethod;webplatesofboxgi
4、rders[2]Therearedefiniteregulationsaboutthestiffen-peanCodeofSteelStructures(EC3-ENV-1993)areersofweldedplategirdersintheChineseCodeofSteelreasonableandtheyareillustratedinFig.1.Itconsid-[1]Structures(GBJ17-88),butnospecificillustrationersthatthetensionfielddis
5、tributesbetweenthetrans-aboutthoseofboxgirders.Now,theNationalCodeversestiffenersandup-downflanges,andtheflangesRevisingGroupismodifyingthesteelcode.Themainmaycontributetotheresistanceofshearstressesuntilspiritistotakeadvantageofthepost-bucklingtheplasticityhing
6、ehasbeenformed.strengthofplategirdersunderstaticloadbutnore-Usingthetensionfieldmethod,theultimateshearquirementisraisedaboutboxgirders.Infact,generallycapacityofwebplateswithinner-outerstiffenerscantheprosperouspost-bucklingloadcapacityofwebbeobtainedasplatesof
7、boxgirderscanbeusedandthereareobviousVbb=2[h0twbb+0.9(gtwbbsin)]/!R(1)differencesbetweenboxgirdersandplategirdersbe-where!Ristheresistantcoefficient,bbisthetensioncauseoftheexistenceofdoublewebplates.stressinthetensionfieldTherearethreemainloadconditionssucha
8、s222bb=fy-3bb+∀-∀(2)shearstresses,longitudinalstressesandinteractionof∀=1.5bbsin2(3)thosetwostresses.Thepost-bucklingbehaviourisdif-bbistheelasticcriticalshearstr
