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页数:8页
时间:2020-03-25
《无背索曲塔曲梁斜拉桥施工优化.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
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无背索曲塔曲梁斜拉桥施工优化刘世华北水利水电大学土木与交通学院,河南明1’2,刘永健2,琚明杰3郑州450045;2.长安大学旧桥检测与加固技术交通行业重点实验室,陕西西安710064;3.东莞市交通投资集团有限公司,广东东莞523120)摘要:为优化无
2、背索曲塔曲梁斜拉桥施工顺序,对桥梁施工进行全过程模拟,确保桥梁在施工过程中的安全及正常使用状态下受力合理,以无背索曲塔曲梁斜拉桥——东莞水道桥为工程背景,采用MIDAS/CIVIL空间有限元分析软件,分析在钢主梁悬臂施工前拆除支架,同时,钢主梁节段与对应主塔节段同步悬臂施工的情况下,对施工工期、造价、主塔应力及变形、主梁的应力及变形、拉索初拉力的影响。结果表明:(1)优化施工顺序后,结构传力更明确,能有效缩短工期,节省工程投资。(2)优化前后主塔应力分布规律一致,应力影响小;优化后内、外弧侧主塔位移不对称性明显,对主塔x
3、方向位移影响较大:(3)优化后对钢主梁受力有所改善,对混凝土主梁受力影响小;主梁。方向位移影响较大,发生在主跨3/4跨径处,需要调整施工预拱度。(4)优化施工顺序后,24—5”拉索初拉力均有所增大,拉索安全系数均满足设计规范要求。关键词:桥梁工程;无背索斜拉桥;有限元分析;施工优化;曲塔;钢一混组合梁中图分类号:U448.27文献标识码:A文章编号: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
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