斜交连续箱梁顶推施工中落梁仿真分析

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1、桥梁建设2014年第44卷第1期(总第224期)BridgeConstruction。Vo1．44，No．1，2014(TotallyNo．224)101文章编号：1003—4722(2014)01—0101—06斜交连续箱梁顶推施工中落梁仿真分析蒋田勇，安磊，田仲初，徐金华(长沙理工大学土木与建筑学院，湖南长沙410114)摘要：为了解斜交连续梁桥顶推落梁施工中结构受力状态，给施工提供技术支撑，以长沙市营盘东路浏阳河大桥为例，采用在支承处节点施加强迫竖向位移的方法模拟箱梁的落梁过程，对落梁过程进行仿真分析，计算千斤顶的顶升力和混凝土箱梁的应力，与实测结果进行比较，并分析相

2、邻墩顶的梁底高差对顶升力和箱梁应力的影响。结果表明：箱梁顸、底板始终处于受压状态，且只有顸升处的梁体及其相邻粱体的应力变化相对较大；当相邻墩顶的梁底高差在25mm以内时，其顶升墩处的项升力增量在5以内，且顶升墩处箱梁截面仍处于受压状态；落梁过程中，顶升力和箱梁应力的仿真计算结果与实测结果吻合较好，说明仿真分析准确、可靠。关键词：连续梁桥；斜交桥；箱形梁；顶推法施工；仿真分析；落梁；梁底高差；应力；有限元法中图分类号：U448．21；U445．462文献标志码：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