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ID:36556608
大小:3.49 MB
页数:72页
时间:2019-05-12
《大跨度钢管混凝土拱桥稳定性研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、西南交通大学硕士学位论文大跨度钢管混凝土拱桥稳定性研究姓名:黄玮申请学位级别:硕士专业:桥梁与隧道工程指导教师:刘元久20080601西南交通大学硕士研究生学位论文第1I页AbstractWiththerapideconomicdevelopment,.TheCFSTisconsideredasthepreferentialstructurematerialformanyadvantagessueh嬲reducingthematerialsandstructureweight,easyconstructionandlargebearingcapacityere.W1
2、lile,theCFSTarchbridgeiseharacterizedascontinousconstructionsystemchanging,seriously110n-linearinflueneing,highlycouplingoftheconstructionprocessandthebridgestatusincompletedstage.So.itismostvaluabletocarryOllthestabilityaiialysis.BasedOntheNanningbridge,thestabilityanalysisineachstage
3、oftheconstructionwascarried011..(1)Thebasicstabilitytheoryandthecomputingtheoryofthearchbridgewereintroduced,consideringthecharacteristicsofthesteelconcretearchbridge,theevaluatofiindexandfailurecriteriawerepresentedaswellasthefailuremodesofthebridge.theSincrementalfiniteelementmethods
4、werealsodieussed.(2)Adoptingtheunifiedstrain-stressmodel,theCFSTwereconsideredaSonecombinedmaterial.WiththehelpoftheANSYSprogram,thesteelconcretearchbridgewasconstructedwiththebeaml88elementtype.0(3)Theconstructionprocessofthesteelconcretewascomplicated.Eccentricloadinducedbythepumpedc
5、oncreteinthesteelpipeandthechangeofthestiffnessinfluencingOilthestabilityofthestructureWaSlarge.,nlestabilityofthestructureineachstageofthesixpumpplanswereanalyzed.砀eoptimalsequenceoftheCFSTwasgained.··(4)Basedonthebucklinganalysisandthearc,lengthcontrolledincrementalfiniteelmentmethod
6、s,tlleIinearelasticandelato-plasticstabilityofthebridgeintheconstructionandfinishedstageswerecomputedandanalyzed.ThefirstandSecondstabilityfactorsandfailuemodeswereobtained.The110n—linearfeaturesinfluencingOilthestability.ofthebridgewereanalyzed.ItWaScomideredthatinitialgeometrydefects
7、andnon-liearmaterialweremajorinfluencingfactors.While,thenon-linear●geometrym.flueneingOnttie.stabili哆factorswascomparativelylittle.Consideringthewindloadinfluencingonthestabili够ofthestructure,the.1ateralstabilityofthestructurewasanalyzed..砌e,the.ratioofthewideandspaninfluencingOnthe
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