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1、橋梁建設(shè)2016年第46卷第6期(總第241期)106BridgeConstruction，V01．46．No．6．2016(TotallyNo．241)文章編號：1003—4722(2016)06—0106—06短線法簡支轉(zhuǎn)連續(xù)剛構(gòu)橋合龍方案比選方淑君，余豪(中南大學(xué)，湖南長沙410075)摘要：廣州市軌道交通二十一號線某高架橋為四跨一聯(lián)簡支轉(zhuǎn)連續(xù)剛構(gòu)橋[跨徑(38+40+40+38)m3，主粱采用短線法預(yù)制節(jié)段箱梁，采用架橋機先逐跨拼裝成簡支梁段，再各跨合龍形成連續(xù)剛構(gòu)體系。針對實際施工中可能出現(xiàn)的3種合龍方案：簡支轉(zhuǎn)中墩n型
2、連續(xù)剛構(gòu)，再轉(zhuǎn)全橋剛構(gòu)的2次體系轉(zhuǎn)換施工(方案1)；簡支轉(zhuǎn)T構(gòu)，再轉(zhuǎn)兀型連續(xù)剛構(gòu)，最后轉(zhuǎn)全橋剛構(gòu)的3次體系轉(zhuǎn)換施工(方案2)；簡支梁轉(zhuǎn)全橋剛構(gòu)的1次體系轉(zhuǎn)換施工(方案3)，采用MIDASCivil軟件建立全橋有限元模型，分析3種方案的結(jié)構(gòu)內(nèi)力及變形，并從適用性、施工周期等方面進行綜合比選，該橋選擇方案2施工。采用方案2施工成橋后，墩身位移及主梁撓度均控制較好，全橋結(jié)構(gòu)滿足城市軌道交通的運營設(shè)計要求。關(guān)鍵詞：剛構(gòu)橋；短線法；合龍方案；有限元法；施工分析；方案比選；橋梁施工中圖分類號：U448．23；U445．4文獻標志碼：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
