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1、大跨度斜拉钢管混凝土拱桥屈曲分析第4O卷第5期2010年9月河南大学(自然科学版)JournalofHenanUniversity(NaturalScience)Vo1.40NO.5Sep.20l0大跨度斜拉钢管混凝土拱桥屈曲分析陈冠桦,甄喻惠,贾宏宇,柳红卫.,王登科(1.贵州省交通规划勘察设计研究院,贵阳550001;2.西南交通大学土木工程学院,成都610031;3.广东省安全科学技术研究所,广州510060;4.中国科学院武汉岩土力学研究所,武汉430071)摘要:以某大跨度斜拉钢管混凝土拱桥为研究对象,利用有限
2、元软件ANSYS建立该桥的空间有限元模型,计算该结构的线弹性和几何非线性屈曲稳定系数,屈曲模态,分析结构稳定性能的特点,并与同等跨度的系杆拱桥稳定性能进行了对比分析.结果表明:横向刚度对结构稳定性起控制作用,屈曲模态表现为面外对称侧倾失稳,线弹性屈曲稳定系数大于4.0,结构的稳定性满足使用要求;拉索对系杆拱结构面内稳定贡献较大,对结构面外稳定贡献非常小;结构面外和面内稳定系数均比同等跨度系杆拱桥高;关键位置的位移,应力时程曲线图中几何非线性现象不明显,几何非线性对结构屈曲的影响程度较小.关键词:斜拉钢管混凝土拱桥;屈曲分
3、析;屈曲模态;有限元;系杆拱桥中图分类号:U448.141.5文献标志码:A文章编号:1003—4978(2010)05—0537—05BucklingAnalysisofLong-SpanCable—StayedConcreteFilledSteel—TubularArchBridgeCHENGuan—hua,ZHENYu—hui,JIAHong—yu,IIUHong—wei.,WANGDeng—ke(1.GuizhouCommunicationPlanningandProspectingDesignAcademy,G
4、uiyang550001,China2.SchoolofCivilEngineering,SouthwestJiaotongUniversity,Chengdu610031,China3.GuangdongInstituteofSafetyScienceandTechnology,Guangzhou510060,China4.InstituteofRockandSoilMechanics,ChineseAcademyofSciences,Wuhan430071,China)Abstract:Takingacertainl
5、ong—spancable:stayedconcretefilledsteel—tubulararchbridgeasresearchobject.thespacefiniteelementmodelofthebridgeisestablishedthroughtheapplicationofthefiniteelementanalysissoftwareANSYS.Thelinearelasticity,geometricalnonlinearbucklingstabilitycoefficientandbucklin
6、gmodeofthestructurearecalculated.Additionallythecharacteristicsofthestabilityperformanceisanalyzed.Thestabilityperformanceofthebridgeisfurthermoreundercomparativeanalysiswithanothercoequalspantiedarchbridge.Theresultsshowthatlateralstiffnesshaveamaincontroloverth
7、estructuralstability.Thebucklingmodeismanifestedasoutofplanerollinstability.Thelinear—elasticbucklingstabilitycoefficientislargerthanfour,thestabilityofthestructuremeetstheuserequirement;thestayed—cablehasagreatcontributiontOthestabilityinplaneoftiedarchstructure
8、whileaverysmallcontributiontOthestabilityoutofplane;thestabilitycoefficientsofinplaneandoUtofplanearehigherthanacoequalspantiedarchbridge;thegeometricalnonline
