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1、第11卷第2期鐵道科學與工程學報Volume11Number22014年4月JournalofRailwayScienceandEngineeringApril2014鋼一混凝土連續(xù)組合箱梁負彎矩區(qū)極限抗彎承載力研究余志武，張大付，焦姣。(1．中南大學土木工程學院，湖南長沙4100752．中南大學高速鐵路建造技術(shù)國家實驗室，湖南長沙410075)摘要：基于塑性分析理論，分別利用規(guī)范法和截面轉(zhuǎn)換法計算連續(xù)組合箱梁負彎矩區(qū)的極限抗彎承載力。規(guī)范法中先將鋼箱梁截面轉(zhuǎn)化為工字型鋼梁截面，然后按照規(guī)范中已有的方法進行計算。截面轉(zhuǎn)換法中先將鋼箱梁截面轉(zhuǎn)換為矩形截面，進一步推導出統(tǒng)一
2、的計算公式。研究結(jié)果表明：將2種計算結(jié)果與試驗結(jié)果進行對比，三者吻合很好，說明2種方法均準確適用。2種方法間進行比較，計算結(jié)果誤差很小，但截面轉(zhuǎn)換法避免了規(guī)范法中判斷截面類型的步驟，相對簡化了計算過程。研究結(jié)果為鋼一混連續(xù)組合箱梁的設(shè)計提供了一定的參考。關(guān)鍵詞：連續(xù)組合箱梁；負彎矩區(qū)；規(guī)范法；截面轉(zhuǎn)換法中圖分類號：U441．2文獻標志碼：A文章編號：1672—7029(2014)02—0001—06ResearchonultimateflexuralbearingcapacityofnegativemOmentareaforsteel——concretecomposit
3、econtinuousboxgirderYUZhiwu，ZHANGDafu，JIAOJiao'(1．SchoolofCivilEngineering，CentralSouthUniversity，Changsha410075，China；2．NationalEngineeringLaboratoryforHighSpeedRailwayConstruction，CentralSouthUniversity，Changsha410075，China)Abstract：Basedonplasticanalysistheory，theultimateflexuralbeari
4、ngcapacityofnegativemomentareaforsteel——concretecompositecontinuousboxgirderwascalculatedwiththestandardmethodandcrosssectionalconvemionapproach，respectively．Astothespecification—basedapproach，thecross—sectionofsteelboxgirderwasfirstlyconvertedintoI—shapedform，andthenthecorrespondingcalc
5、ulationwasconductedaccordingtotheexistingmethodinthecriterion．Bycontrast，thecrosssectionalconversionapproachwasutilizedtoderivetheuniformfor-mulasthroughshiftingthepracticalcross—sectionofsteelboxgirderintorectangularone．Theresultsrevealthatthecalculatedresultswithabovetwomethodsareconsi
6、stentwiththatgainedfromexperimentalresults，whichmeansthatthetwoapproachesarevalidandapplicable．Thereexistslittledifferencewhencomparingtheresultscalculatedwithabovetwomethods，whileitrelativelysimplifiesthecalculationprocesswithcrosssectionalconver-sionapproachsinceitavoidstheprocedureofj
7、udgingthesectiontypeinthestandardmethod．Theresearchfind—ingscanprovidecertainreferenceforthedesignofsteel—concretecompositecontinuousboxgirders．Keywords：steel—concretecompositecontinuousboxgirder；negativemomentarea；standardmethod；crosssectionalconversi0nmethod鋼一混連續(xù)組合箱梁常應用
