钢管混凝土拱桥吊杆张拉方案优化研究.pdf

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1、桥梁建设2016年第46卷第4期(总第239期)BridgeConstruction。V01．46，No．4，2016(TotallyNo．239)O，文章编号：1003—4722(2016)04—0067—06钢管混凝土拱桥吊杆张拉方案优化研究傅金龙，黄天立(中南大学土木工程学院，湖南长沙410075)摘要：为得到钢管混凝土拱桥的合理吊杆张拉方案，基于常用的张拉方式，提出了5种基本张拉顺序，给出了吊杆张拉方案的合理性准则，结合某钢管混凝土拱桥工程实例，采用MIDASCivil建立全桥有限元模型，对比分析了11种吊杆张拉方案，探讨了

2、各方案对应的结构受力状况。结果表明：对称依次张拉吊杆施工方便，但易造成构件局部应力过大，影响结构安全，宜从拱脚区向拱顶区对称依次张拉吊杆；对称交替张拉吊杆可使构件应力分布更均匀，利于保证结构安全，宜从四分区或拱脚区开始对称交替张拉吊杆；与单批次吊杆张拉相比，采用多批次吊杆张拉可显著降低构件应力和吊杆张拉控制力，可考虑将对称依次张拉和对称交替张拉相组合的多批次吊杆张拉方案。关键词：钢管混凝土拱桥；吊杆；合理性准则；有限元法；张拉方案；优化中图分类号：U448．22；U443．38文献标志码：AOptimizationofTension

3、ingSchemeforHangersofConcrete-FilledSteelTubeArchBridgeFUJin—long(SchoolofCivilEngineering．Central．H以NGTian-liSouthUniversity，Changsha410075，China)Abstract：Toacquiretherationaltensioningschemeforthehangersofconcrete—filledsteeltubearchbridge，5basictensioningsequenceswe

4、reproposedandtherationalitynormoftheten—sioningschemewasgivenonthebasisofthecommonlyusedtensioningwaysforthehangers．WithreferencetOtheexampleofapracticalconcrete—filledsteeltubearchbridge，thefiniteelementmodelforthewholebridgeofthebridgewasestablished，usingtheMIDASCivi

5、l，11tensioningschemesforthehangerswerecomparativelyanalyzedandthestructuralforceconditionscorre—spondingtOeachschemewerestudied．Theresultsshowthatthesymmetricallyandsuccessivelytensioningofthehangersisconvenientforconstruction，butwilleasilycausetoogreatlocalstressinthe

6、componentsandwilladverselyinfluencethesafetyofthestructure．Thetensioningofthehangersshouldpreferablyproceedsymmetricallyandsuccessivelyfromtheareasofthearchspringstothatofthearchcrown．Thesymmetricallyandalternatelytensioningofthehangerscanmakethestressdistributioninthe

7、componentsmoreuniformandiSconducivetOthesafetyofthestructure．Thetensioningofthehangersshouldpreferablystartsymmetricallyandalternatelyformtheareasofthe1／4spanofthearchorfromtheareasofthearchsprings．Comparedtothetensioningofthehangersinasinglebatch，thetensioningofthehan

8、gersinthemultiplebatchescansignificantlydecreasethestressinthecomponentsandthecontrolledtensioningforcesofthehangersa