铁路箱形混合梁斜拉桥钢混结合段有限元分析

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1、桥梁建设2015年第45卷第1期(总第230期)BridgeConstruction，Vo1．45，No．1，2015(TotallyNo．230)45文章编号：1003一i722(2015)O1—0045—06铁路箱形混合梁斜拉桥钢一混结合段有限元分析姚亚东，杨永清，刘振标。，蒲黔辉，施洲(1．西南交通大学土木工程学院，四川成都610031；2．中铁第四勘察设计院集团有限公司，湖北武汉430063)摘要：为研究铁路钢箱混合梁斜拉桥钢一混结合段的受力特征及传力机理，以宁波铁路枢纽北环线甬江特大桥为背景，采用ANSYS有限元软件建立该桥钢一混结合段的三维有限元模型，分析钢一混结合

2、段中钢壳体和混凝土的受力及轴力分配比例。结果表明：在计算荷栽作用下，结构纵向受力板件均处于受压状态，应力水平较低；除承压板处发生突变外，其他部位变化平缓；混凝土各截面应力水平较低，截面发生一定的面外变形；承压板传力作用较大，结合段54的轴力通过其传递，其余轴力通过PBL键和剪力钉传递；剪力键轴力传递比例呈两头大、中间小的马鞍形分布。关键词：铁路桥；钢箱梁；钢一混结合段；传力机理；PBL键；有限元法；应力分析中图分类号：U441．4；U448．13文献标志码：AFiniteElementAnalysisofSteelandConcreteJointSectionofRailway

3、HybridBoxGirderCable—·StayedBridgeYAOYa—dong，YANGYong—qing，LIUZhen—biao，PUQian—hui，SHIZhou(1．SchoolofCivilEngineering，SouthwestJiaotongUniversity，Chengdu610031，China；2．ChinaRailwaySiyuanSurveyandDesignGroupCo．，Ltd．，Wuhan430063，China)Abstract：Toinvestigatetheforcecharacteristicsandforcetransf

4、ermechanismofthesteelandconcretejointsectionofrailwayhybridboxgirdercable—stayedbridge，theYongjiangRiverBridgeonthe：NorthRingLinkofNingboRailwayTerminalwastakenasanexample．Thesoft—wareANSYSwasusedtoestablishthethree—dimensionalfiniteelementmodelforthesteelandconcretejointsectionofthebridge，t

5、heforceconditionsandaxialforcedistributionproportionsofthesteelshellandconcreteintheiointsectionwereanalyzed．Theresultsoftheanalysisdemon—stratethatundertheactionofthecalculatedload，thestructurallongitudinalforce—bearingplatesareallinthecompressionstateandthestructuralstress1evelsarelow．With

6、theexceptionthattheforcesinthebearingplatechangeabruptly，thechangingoftheforcesinotherpartsisgentle．Thestresslevelsofthedifferentsectionsoftheconcretearelowandcertainout—of—planedeforma—tionofthesectionsoccurs．Thefunctionofthebearingplateintheforcetransferissignificant．About54axialforceofthe

7、iointsectiontransfersviathebearingplatewhiletherestoftheaxi—alforcetransfersviathePBLconnectorsandshearstuds．Theproportionsoftheaxialforcetransferoftheconnectorspresentthesaddle—shapedistributionthatislargeatbothendsandsmallinthemiddle．Keywords：rai