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时间:2019-05-11
《大跨径自锚式悬索桥成桥状态动力特性参数分析》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、桥梁建设2013年第43卷第6期(总第223期)64BridgeConstruction,Vo1.43,No.6,2013(TotallyNo.223)文章编号:1003—4722(2013)06—0064—07大跨径自锚式悬索桥成桥状态动力特性参数分析康俊涛,袁敏,王同民(1_武汉理工大学土木工程与建筑学院,湖北武汉4300702.中铁大桥局集团第一工程有限公司,河南郑州450054)摘要:为研究大跨径自锚式悬索桥结构参数对成桥状态下桥梁动力特性的影响,以桃花峪黄河大桥主桥为工程背景,基于MIDASCivil2012平台建立全桥空间有限元模型,采用子空间迭代
2、法进行动力计算,分析了垂跨比、恒载集度和结构刚度等参数的变化对该桥成桥状态动力特性的影响。结果表明:桥梁振型较合理,频谱分布密集;垂跨比对结构竖弯振型频率影响较大;恒载集度对结构各阶振型频率影响明显;主缆抗拉刚度主要影响加劲梁的竖弯、扭转振型频率;吊索抗拉刚度对结构的各阶振型频率影响很小;加劲梁抗弯刚度对结构的竖向、侧向、扭转振型频率影响显著;桥塔的纵向抗弯刚度主要影响结构的纵飘振型。关键词:自锚式悬索桥;成桥状态;有限元法;动力分析;垂跨比;恒载集度;结构刚度中图分类号:U448.25文献标志码:AParametricAnalysisofDynamicPer
3、formanceofCompletionStateofLongSpanSelf-AnchoredSuspensionBridgeKANGJun-tao,YUANMin,WANGTong-min(1.SchoolofCivilEngineeringandArchitecture,WuhanUniversityofTechnology,Wuhan430070,China;2.The1stEngineeringCo.,Ltd.,ChianRailwayMajorBridgeEngineeringGroup,Zhengzhou450054,China)Abstract
4、:Tostudytheinfluencesofthestructuralparametersoflongspanself—anchoredSUS—pensionbridgeonthedynamicperformanceofthecompletionstateofthebridge,themainbridgeofTaohuayuHuangheRiverBridgewascitedasanexampleandaspatialfiniteelementmodelforthewholebridgeoftheexamplebridgewasestablishedonth
5、eplatformofthesoftwareMIDASCivil2012.Thesubspaceiterationmethodwasusedtocarryoutthedynamiccalculationandtheinfluencesoftheparametricchangesofthesag—to—spanratios,deadloadintensityandstructuralstiffnessonthedynamicperformanceofthecompletionstateofthebridgewereanalyzed.There—sultsofth
6、ecalculationandanalysisdemonstratethatthebridgehastherationa1vibrationmodesanddensefrequencyspectrumdistribution.Theinfluenceofthesag—to—spanratiosontheverticalbendingvibrationmodeandfrequencyofthestructureisgreat.Theinfluenceofthedeadloadin—tensityonthevibrationmodesandfrequencieso
7、fthedifferentordersofthestructureissignifi—cant.Themaincabletensilestiffnessmainlyhasinfluenceontheverticalbendingandtorsionalvibrationmodesandfrequenciesofthestiffeninggirder.Theinfluenceofthehangertensilestiff—nessonthevibrationmodesandfrequenciesofthedifferentordersofthestructure
8、isverylittle.Theinf
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