钢-混凝土连续组合箱梁负弯矩区极限抗弯承载力研究

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1、第11卷第2期铁道科学与工程学报Volume11Number22014年4月JournalofRailwayScienceandEngineeringApril2014钢一混凝土连续组合箱梁负弯矩区极限抗弯承载力研究余志武，张大付，焦姣。(1．中南大学土木工程学院，湖南长沙4100752．中南大学高速铁路建造技术国家实验室，湖南长沙410075)摘要：基于塑性分析理论，分别利用规范法和截面转换法计算连续组合箱梁负弯矩区的极限抗弯承载力。规范法中先将钢箱梁截面转化为工字型钢梁截面，然后按照规范中已有的方法进行计算。截面转换法中先将钢箱梁截面转换为矩形截面，进一步推导出统一

2、的计算公式。研究结果表明：将2种计算结果与试验结果进行对比，三者吻合很好，说明2种方法均准确适用。2种方法间进行比较，计算结果误差很小，但截面转换法避免了规范法中判断截面类型的步骤，相对简化了计算过程。研究结果为钢一混连续组合箱梁的设计提供了一定的参考。关键词：连续组合箱梁；负弯矩区；规范法；截面转换法中图分类号：U441．2文献标志码：A文章编号：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钢一混连续组合箱梁常应用