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1、橋梁建設(shè)2014年第44卷第1期(總第224期)BridgeConstruction。Vo1．44，No．1，2014(TotallyNo．224)101文章編號(hào)：1003—4722(2014)01—0101—06斜交連續(xù)箱梁頂推施工中落梁仿真分析蔣田勇，安磊，田仲初，徐金華(長(zhǎng)沙理工大學(xué)土木與建筑學(xué)院，湖南長(zhǎng)沙410114)摘要：為了解斜交連續(xù)梁橋頂推落梁施工中結(jié)構(gòu)受力狀態(tài)，給施工提供技術(shù)支撐，以長(zhǎng)沙市營(yíng)盤東路瀏陽(yáng)河大橋?yàn)槔?，采用在支承處?jié)點(diǎn)施加強(qiáng)迫豎向位移的方法模擬箱梁的落梁過(guò)程，對(duì)落梁過(guò)程進(jìn)行仿真分析，計(jì)算千斤頂?shù)捻斏突炷料淞旱膽?yīng)力，與實(shí)測(cè)結(jié)果進(jìn)行比較，并分析相
2、鄰墩頂?shù)牧旱赘卟顚?duì)頂升力和箱梁應(yīng)力的影響。結(jié)果表明：箱梁頇、底板始終處于受壓狀態(tài)，且只有頇升處的梁體及其相鄰粱體的應(yīng)力變化相對(duì)較大；當(dāng)相鄰墩頂?shù)牧旱赘卟钤?5mm以內(nèi)時(shí)，其頂升墩處的項(xiàng)升力增量在5以內(nèi)，且頂升墩處箱梁截面仍處于受壓狀態(tài)；落梁過(guò)程中，頂升力和箱梁應(yīng)力的仿真計(jì)算結(jié)果與實(shí)測(cè)結(jié)果吻合較好，說(shuō)明仿真分析準(zhǔn)確、可靠。關(guān)鍵詞：連續(xù)梁橋；斜交橋；箱形梁；頂推法施工；仿真分析；落梁；梁底高差；應(yīng)力；有限元法中圖分類號(hào)：U448．21；U445．462文獻(xiàn)標(biāo)志碼：ASimulationAnalysisofJacking—downofGirderinIncrementalLaun
3、chingConstructionofObliqueContinuousBoxGirderJIANGTian—yong，ANLei，TIANZhong。chu，XUJin—hua(SchoolofCivilEngineeringandArchitecture，ChangshaUniversityofScienceandTechnology，Changsha410114，China)Abstract：Tohaveanunderstandingofthestructuralforceconditionsoftheobliqueconcretecontinuousboxgirde
4、rbridgeintheconstructionofincrementallaunchingandjacking—downofthegirderandtoprovidetechnicalsupportfortheconstruction，theYingpanEastRoadLiuyangRiv—erBridgeinChangshacitywascitedasanexample，theprocessofjacking—downoftheconcreteboxgirderofthebridgewassimulatedandanalyzedbythemethodofapplyin
5、gforcedverticaldis—placementatthesupportnodalpoint，thejackingforcesofthejacksandthestressofthegirderwerecalculated，thecalculationswerecomparedtothemeasurementsandtheinfluencesofthegirderbottomheightdifferencesoftheadjacentpiertopsonthejackingforcesandthestresswereanalyzed．Theresultsofthesi
6、mulationandanalysisrevealthatthetopandbottomslabsoftheboxgirderhavebeenincompressionallthetimewiththeexceptionthatonlythestressofthegirderatthejackingpierandadjacentpierschangesrelativelygreatly．Whentheheightdiffer—encesofthegirderbottomattheadjacentpiertopsarewithin25mm，theincrementofthej
7、ack—ingforcesofthejackingpierarewithin5andthecrosssectionofthegirderatthejackingpierremainscompressive．Inthejacking—downofthegirder，thesimulationcalculationsofthejackingforcesandthestressofthegirderarewellagreeablewiththemeasurements，showingthatthesimulationan
