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时间:2020-03-25
《多跨连续梁拱组合体系桥梁施工关键问题研究.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、桥梁建设2017年第47卷第4期(总第245期)48BridgeConstruction,Vol.47,No.4,2017(TotallyNo.245)文章编号:1003-4722(2017)04-0048-06多跨连续梁拱组合体系桥梁施工关键问题研究梅葵花,王贤良,赵育(长安大学公路学院,陕西西安710064)摘要:安康市城东汉江大桥主桥为(75+2×125+160+2×125+75)m多跨连续梁拱组合体系桥梁,全桥采用先梁后拱法施工,系梁采用平衡悬臂浇筑法施工,中跨跨中33m梁段采用支架现浇法施工。为选择合理的现浇
2、段支架拆除时机、边跨配重卸载时机、临时固结拆除顺序以及吊杆张拉顺序和次数等,采用MIDASCivil建立全桥有限元模型,针对各种方案下的结构进行模拟分析。结果表明:跨中现浇段的支架应在张拉完全部吊杆后再拆除;边跨配重应在中跨或次边跨合龙后再卸载;应待相邻孔合龙后再拆除前一合龙孔的临时固结;应对称交替地张拉吊杆,设计张拉力较小时可一次张拉到位,设计张拉力较大时应分批张拉到位。该桥采取以上方案施工后,结构受力状态良好。关键词:梁拱组合体系桥;悬臂浇筑法;有限元法;现浇支架;配重;临时固结;吊杆张拉顺序;桥梁施工中图分类号:
3、U448.22;U445.4文献标志码:AStudyofCriticalIssuesonConstructionofaHybridSystemBridgeofMulti‐SpanContinuousGirderandArchesMEIKuihua,WANGXianliang,ZHAO‐Yu‐(SchoolofHighway,Chang′anUniversity,Xi′an710064,China)Abstract:ThemainbridgeoftheChengdongHanjiangRiverBridgeinAnkan
4、gCityisahybridsystembridgeofmulti‐spancontinuousgirderandarcheswithspanarrangement(75+2×125+160+2×125+75)m.Thewholebridgeofthebridgeisconstructed,usingthemethodofcon‐structingthegirderbeforeconstructingthearches,ofwhichthetiegirderiscastinsitu,usingthefreecantil
5、evermethodandthe33mlonggirdersegmentsatthemidspanofthecentralspanarecastinsitu,usingthescaffoldingmethod.Intheconstructionofthebridge,tochoosethereasona‐bletimeforremovalofthescaffoldingforthecast‐in‐situsegments,thetimeforunloadingofthecounterweightonthesidespa
6、ns,thesequencesforremovalofthetemporaryrigidfixityandthesequencesandtimesfortensioningofthehangers,theMIDASCivilwasusedtoestablishthefiniteelementmodelforthewholebridgeandthestructureunderthedifferentschemeswassimulatedandanalyzed.Theresultssuggestthatthescaffol
7、dingforthecast‐in‐situsegmentsatthemidspanofthecentralspanshouldberemovedafterthewholehangersarewelltensioned.Thecounter‐weightonthesidespansshouldbeunloadedafterthecentralspanorthesecondarysidespansareclosed.Thetemporaryrigidfixityforthepreviousclosedspanshould
8、beremovedaftertheadja‐centspansareclosed.Thehangersshouldbetensionedsymmetricallyandalternatively.Forthehangerswithlittledesignedtension,thehangersshouldbetensionedin
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