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时间:2020-03-27
《大跨度斜拉钢管混凝土拱桥屈曲分析.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4O卷第5期河南大学学报(自然科学版)Vo1.40NO.52010年9月JournalofHenanUniversity(NaturalScience)Sep.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
2、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—05Buckling
3、AnalysisofLong-SpanCable—StayedConcreteFilledSteel—TubularArchBridgeCHENGuan—hua,ZHENYu—hui,JIAHong—yu,IIUHong—wei。,WANGDeng—ke(1.GuizhouCommunicationPlanningandProspectingDesignAcademy,Guiyang550001,China2.SchoolofCivilEngineering,SouthwestJiaotongUniversity,Chengdu610031,China3.GuangdongInst
4、ituteofSafetyScienceandTechnology,Guangzhou510060,China4.InstituteofRockandSoilMechanics,ChineseAcademyofSciences,Wuhan430071,China)Abstract:Takingacertainlong—spancable:stayedconcretefilledsteel—tubulararchbridgeasresearchobject.thespacefiniteelementmodelofthebridgeisestablishedthroughtheappl
5、icationofthefiniteelementanalysissoftwareANSYS.Thelinearelasticity,geometricalnonlinearbucklingstabilitycoefficientandbucklingmodeofthestructurearecalculated.Additionallythecharacteristicsofthestabilityperformanceisanalyzed.Thestabilityperformanceofthebridgeisfurthermoreundercomparativeanalysi
6、swithanothercoequalspantiedarchbridge.Theresultsshowthatlateralstiffnesshaveamaincontroloverthestructuralstability.Thebucklingmodeismanifestedasoutofplanerollinstability.Thelinear—elasticbucklingstabilitycoefficientislargerthanfour,thestabilityofthestructuremeetstheuserequirement;thestayed—cab
7、lehasagreatcontributiontOthestabilityinplaneoftiedarchstructurewhileaverysmallcontributiontOthestabilityoutofplane;thestabilitycoefficientsofinplaneandoUtofplanearehigherthanacoequalspantiedarchbridge;thegeometricalnonlinearitiesofthedi
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