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1、第32卷第ll期公路交通科技V01.32No.112015年11月JournalofHighwayandTransportationResearchandDevelopmentNov.2015doi:i0.3969/j.issn.1002—0268.2015.11.011無背索曲塔曲梁斜拉橋施工優(yōu)化劉世華北水利水電大學(xué)土木與交通學(xué)院,河南明1’2,劉永健2,琚明杰3鄭州450045;2.長(zhǎng)安大學(xué)舊橋檢測(cè)與加固技術(shù)交通行業(yè)重點(diǎn)實(shí)驗(yàn)室,陜西西安710064;3.東莞市交通投資集團(tuán)有限公司,廣東東莞523120)摘要:為優(yōu)化無
2、背索曲塔曲梁斜拉橋施工順序,對(duì)橋梁施工進(jìn)行全過程模擬,確保橋梁在施工過程中的安全及正常使用狀態(tài)下受力合理,以無背索曲塔曲梁斜拉橋——東莞水道橋?yàn)楣こ瘫尘?,采用MIDAS/CIVIL空間有限元分析軟件,分析在鋼主梁懸臂施工前拆除支架,同時(shí),鋼主梁節(jié)段與對(duì)應(yīng)主塔節(jié)段同步懸臂施工的情況下,對(duì)施工工期、造價(jià)、主塔應(yīng)力及變形、主梁的應(yīng)力及變形、拉索初拉力的影響。結(jié)果表明:(1)優(yōu)化施工順序后,結(jié)構(gòu)傳力更明確,能有效縮短工期,節(jié)省工程投資。(2)優(yōu)化前后主塔應(yīng)力分布規(guī)律一致,應(yīng)力影響小;優(yōu)化后內(nèi)、外弧側(cè)主塔位移不對(duì)稱性明顯,對(duì)主塔x
3、方向位移影響較大:(3)優(yōu)化后對(duì)鋼主梁受力有所改善,對(duì)混凝土主梁受力影響?。恢髁?。方向位移影響較大,發(fā)生在主跨3/4跨徑處,需要調(diào)整施工預(yù)拱度。(4)優(yōu)化施工順序后,24—5”拉索初拉力均有所增大,拉索安全系數(shù)均滿足設(shè)計(jì)規(guī)范要求。關(guān)鍵詞:橋梁工程;無背索斜拉橋;有限元分析;施工優(yōu)化;曲塔;鋼一混組合梁中圖分類號(hào):U448.27文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1002—0268(2015)11—0068—07ConstructionOptimizationofCurved—·pylonandCurved··girderCable·
4、-stayedBridgewithoutBackStayLIUShi—min91一,LIUYong-jian2,JUMing-jie3(1.SchoolofCivilEngineeringandCommunications,NorthChinaUniversityofWaterResourcesandElectricPower,ZhengzhouHenan450045,China;2.KeyLaboratoryforBridgeDetectionandReinforcementTechnologyofMinistryof
5、Transport,Chang’anUniversity,Xi’anShaanxi710064,China;3.DongguanCommunicationsInvestmentGroupCo.,Ltd.,DongguanGuangdong523120,China)Abstract:Inordertooptimizetheconstructionsequenceofcurved-pylonandcurved-girdercable—stayedbridgewithoutbackstay,tosimulatetheovera
6、llconstructionprocessofthebridgeissimulatedtoensuresafetyduringconstructionprocessandreasonableforcestateofstructureduringnormalservice.OntheprojectbackgroundofDongguanwaterwaybridge,whichisacurved-pylonandcurved-girdercable—stayedbridgewithoutbackstay,byusingthe
7、spatialfiniteelementanalysissoftwareMIDAS/CIVIL,undertheconditionofremovebracketbeforesteelgirdercantileverconstructionandcantileverconstructionbetweengirdersegmentandthecorrespondingpylonsegmentatthesametime,theinfluencesofconstructionperiod,constructioncost,str
8、essanddeformationofthegirderandpylon,andinitialforceofthecableareanalyzed.Theresultshowsthat(1)Afteroptimizationofconstructionsequence,forcetransmissionisclear