短线法简支转连续刚构桥合龙方案比选.pdf

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1、桥梁建设2016年第46卷第6期(总第241期)106BridgeConstruction，V01．46．No．6．2016(TotallyNo．241)文章编号：1003—4722(2016)06—0106—06短线法简支转连续刚构桥合龙方案比选方淑君，余豪(中南大学，湖南长沙410075)摘要：广州市轨道交通二十一号线某高架桥为四跨一联简支转连续刚构桥[跨径(38+40+40+38)m3，主粱采用短线法预制节段箱梁，采用架桥机先逐跨拼装成简支梁段，再各跨合龙形成连续刚构体系。针对实际施工中可能出现的3种合龙方案：简支转中墩n型

2、连续刚构，再转全桥刚构的2次体系转换施工(方案1)；简支转T构，再转兀型连续刚构，最后转全桥刚构的3次体系转换施工(方案2)；简支梁转全桥刚构的1次体系转换施工(方案3)，采用MIDASCivil软件建立全桥有限元模型，分析3种方案的结构内力及变形，并从适用性、施工周期等方面进行综合比选，该桥选择方案2施工。采用方案2施工成桥后，墩身位移及主梁挠度均控制较好，全桥结构满足城市轨道交通的运营设计要求。关键词：刚构桥；短线法；合龙方案；有限元法；施工分析；方案比选；桥梁施工中图分类号：U448．23；U445．4文献标志码：AComp

3、arisonandSelectionofClosureSchemeforaSimply。-SupportedtoContinuousRigid·-FrameBridgePrecastbyShortLineMatchMethodFANGShu-jun．y【，Hao(CentralSouthUniversity，Changsha410075，China)Abstract：AviaductontheRailTransitLineTwenty一0neinGuangzhouCityisthecontinuousrigid—framebrid

4、gewithitsfourspansof(38+40+40+38)marrangedinonecontinuousunitandwithitsstructuralsystemtransformedfromthesimply—supportedbeambridge．Themainbeamofthebridgeisthesegmentalboxbeamthatwasprecastbytheshortlinematchmethod．theseg—mentsofthebeamwerefirstlyassembledintothesimpl

5、y—supportedbeamsegmentsspanbyspanbytheoverheadgantryandthenthebeamsegmentsofthedifferentspanswereclosedtofinallyformacontinuousrigid—framesystem．Consideringthatthe3closureschemesmightbeinvolvedintheactualconstructionofthebridge．suchastheschemeofthe2一timesystemtransfor

6、mationoffirstlytransformingthesimply—supportedbeamsegmentstothe兀一shapecontinuousrigidframesontheintermediatepiersandthentransformingtherigidframesofthewholebridge(scheme1)；theschemeofthe3一timesystemtransformationoffirstlytransformingthesimply—supportedbeamsegmentstoth

7、eT—shapeframes，thentransformingtheT—shapeframestothen—shapecontinuousrigidframesandfinallytransformingtherigidframesofthewholebridge(scheme2)andtheschemeofthe1—。timesystemtransformationoftransformingthesimply--supportedbeamsegmentstotherigidframeofthewholebridge(schem

8、e3)，thesoftwareMIDASCivilwasusedtosetupthefiniteelementmodelforthewholebridge，thestructuralinternalforcesanddeformationofthe