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1、第36卷第3期铁道学报Vol.36No.32014年3月JOURNALOFTHECHINARAILWAYSOCIETYMarch2014文章编号:1001-8361(2014)03-0106-07混凝土板分段浇筑的曲线结合梁施工阶段受力性能研究李运生1,马瑞泽1,侯忠明2,张彦玲1(1.石家庄铁道大学土木工程学院,河北石家庄050043;2.清华大学土木工程系,北京100084)摘要:为了对钢-混凝土曲线结合梁施工阶段的受力性能进行准确分析,进行了混凝土浇筑过程中简支曲线结合梁的模型试验,采用AN
2、SYS有限元计算软件分析了栓钉连接件时变抗剪强度对模型梁施工阶段受力性能的影响。分析结果表明:从一端向另一端分段浇筑混凝土板时结合梁的应力和变形均比一次性整体浇筑时小,且沿梁轴不对称;自各节段之间的浇筑时间间隔为6h起至7d之内,均应计入钢梁与混凝土板之间的早期组合作用,且需考虑这种组合作用随混凝土龄期而增长的时变特性。在对混凝土板浇筑过程中的结合梁进行受力分析时,必须考虑已浇好硬化的梁段中钢梁与混凝土板结合面上的相对滑移,否则会使计算结果偏于不安全,出现工程安全隐患。关键词:曲线结合梁;组合作用
3、;栓钉连接件;时变抗剪强度;施工阶段中图分类号:U448.21文献标志码:Adoi:10.3969/j.issn.1001-8361.2014.03.017ResearchonStressBehaviorsofCurvedCompositeBeamswithConcreteSlabCastedinSegmentsinConstructionStage1,MARui-ze1,HOUZhong-ming2,ZHANGYan-ling1LIYun-sheng(1.SchoolofCivilEnginee
4、ring,ShijiazhuangTiedaoUniversity,Shijiazhuang050043,China;2.DepartmentofCivilEngineering,TsinghuaUniversity,Beijing100084,China)Abstract:Inordertoanalyzethestressedbehaviorsofthesteel-concretecurvedcompositebeamsinthecon-structionstageaccurately,them
5、odeltestswereconductedontwosimplecurvedcompositebeamsduringthecastingprocessofconcreteslabs.Theeffectofthetime-dependedshearstrengthofstudconnectorsonthestressedbehaviorsofcompositebeamsintheconstructionstagewasstudiedusingSoftwareANSYSFE.Thea-nalysis
6、resultsindicateasfollows:Ifaconcreteslabiscastedsegmentallyfromonebeamendtotheother,thestressanddeformationofthecompositebeamaresmallerthanthoseiftheconcreteslabiscastedonce-timea-longthewholesteelgirder,andtheyaredistributedasymmetricallyalongthebeam
7、axis;duringthesegmentalcastingprocessofaconcreteslabofacompositebeam,iftheconcretecastingtimeintervalisbetween6hand7d,thetime-dependentearlycompositeactionshouldbeconsideredinanalysisonthestressbehaviorsofthecompositebeamintheconstructionstage;forthes
8、egmentwheretheconcreteslabhasbeenhardened,therela-tiveslipbetweenthesteelgirderandconcreteslabmustbeconsidered,orthecalculatedresultswillbeunsafeandcausehiddendangers.Keywords:curvedcompositebeam;compositeaction;studconnector;time-dependentshe
