中承式钢管混凝土拱桥稳定性能的研究

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1、中承式钢管混凝土拱桥稳定性能研究摘要近十几年来，钢管混凝土拱桥得到了飞速发展，但是与工程实践相比，钢管混凝土拱桥的理论研究相对滞后。随着跨径的增大和宽跨比的减小，钢管混凝土拱桥的稳定问题尤为突出。因此，对钢管混凝土拱桥稳定性能的研究具有重要的理论意义和工程价值。稳定问题通常分为两类：第一类为分支点失稳，可归结为求特征值的问题，第二类为考虑非线性的极值点失稳。工程上的稳定问题一般属于极值点失稳。本文首先介绍了线性及非线性稳定分析的相关理论及其解法。在此基础上，采用大型通用有限元软件ANSYS对一座跨径为204m的中承式钢管混凝土拱桥的施

2、工阶段进行了线弹性、几何非线性及双重非线性稳定分析。分析结果表明：以线弹性分析的结果作为设计施工的依据是不安全的，对施工阶段的钢管混凝土拱桥的稳定分析必须要考虑几何和材料的双重非线性的影响。最后探讨了风缆的设置、混凝土的灌注顺序、横撑的布置数量及形式和初始几何缺陷对稳定性的影响，并对各影响因素提出了合理可行的建议。本文的计算成果及结论可供钢管混凝土拱桥的设计和施工参考。关键词：稳定系数；线弹性分析；非线性分析；风缆；灌注顺序；初始几何缺陷．T．STUDY0FTHESTABILITYOFHALF—THROUGHCFSTARCHBRIDG

3、EABSTRACTMorethantenyears，concrete—filledsteeltubulararchbridgehavedevelopedrapidly,butcomparedwiththeengineeringpractice，thetheoreticalresearchoftheCFSTarchbridgeisrelativelybackward．Alongwiththeincreaseofthespanandthedecreaseofthewidth—spanratio，thestabilityofCFSTarch

4、bridgeisincreasinglyimportant．Therefore，researchonithasimportanttheoreticalsignificanceandengineeringvalue．Stabilityproblemsareusuallydividedintotwokinds：thefirstoneisbranchpointinstabilitywhichcomesdowntotheeigenvalueproblem，thesecondoneisextremepointinstabilityconside

5、ringnonlinearity．Generally,thestabilityofengineeringproblemsbelongtoextremepointinstability．Firstly,thepaperintroducedthetheoriesofthelinearandnonlinearstabilityanalysisanditssolution．Onthebasis，usingtheFEAsoftwareANSYS，thepaperanalyzesthelinearelasticity,geometricnonli

6、nearityanddoublenonlinearityofaCFSTarchbridgewithaspanfor204mduringtheconstructionphase．Theanalysisresultsshowthat：theresultof．II．thelinearelasticanalysisisnotsafefordesignandconstruction．ThestabilityanalysisinconstructionstageofaCFSTarchbridgemustconsiderdoublenonlinea

7、reffect．Finally,thepaperdiscussesinfluencescausedbysettingofwindcable，poutingsequencesofcoreconcrete，thenumberandlayoutofcrossbracesandinitialgeometricimperfection，andputforwardreasonableandfeasibleadvice．Thiscalculatedresultsandconclusionshavesomereferencevaluefordesig

8、nandconstructionofCFSTarchbridges．KEYWORDS：coefficientofstability；linearelasticanalysis；nonlinearityanalysis；w