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时间:2019-05-13
《非一致激励下大跨斜拉桥的随机地震响应分析》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、第38卷,第3期公路工程Vo1.38.No.32013年6月HighwayEngineeringJun.,2013非一致激励下大跨斜拉桥的随机地震响应分析吴玉华,郭剑飞,蔡若红(1.浙江工业大学之江学院,浙江杭州310024;2.杭州市城建设计研究院有限公司,浙江杭州310001)[摘要]基于平稳随机地震动场理论,对大跨度斜拉桥进行非一致激励下的平稳随机地震响应分析。以金塘大桥主通航孔桥为研究对象建立有限元模型,采用多点平稳随机地震响应分析方法,数值仿真了该斜拉桥在纵桥向、横桥向和竖向多点激励下的地震响应.研究了地震动的空间变化,包括部分相干效应和行波效应以及视波速变化对大跨度斜拉桥地震
2、响应的影响。数值分析结果表明:非一致激励下斜拉桥的内力和位移有较大改变,地震动的行波效应影响比部分相干效应的影响更大,地震动的空间变化对纵桥向激励有利,对横桥向激励影响较小,对竖向激励影响很大且不利。对大跨度斜拉桥,必须进行多点地震激励的响应分析。[关键词]斜拉桥;地震响应;随机振动;非一致激励[中图分类号]u442.55[文献标识码]A[文章编号]1674—0610(2013)03—0048—05RandomSeismicResponseAnalysisofLong--spanCable·-stayedBridgesunderNon-uniformExcitationWUYuhua.G
3、UOJianfei.CAIRuohong!(1.ZhijiangCollegeofZhejiangUniversityofTechnology,Hangzhou,Zhejiang310024,China;2.HangzhouUrbanConstructionDesignandResearchInstituteLtd.,Hangzhou,Zhejiang310001,China)[Abstract]Thestochasticvibrationanalysisoflong—spancable—stayedbridgeundernon—uniformex—citationwasperforme
4、dbasedonthestationaryrandomgroundmotiontheory.Thefiniteelementmodelofmainnavigablespanofjintangbridgewasestablished.TheseismicresponseOfthecable—stayedbridgeunderlongitudinal,transverseandverticalexcitationwerenumericallysimulatedbythemethodofthemulti—suppoftstationaryrandomseismicresponse,andthe
5、influenceofspatialvariationofseismicgroundmotion,includingtraveling—waveeffect,partialcoherenceeffectandthevarietyofapparentwaveveloci—tywerestudied.Theresultsshowthattheinternalforcesanddisplacementofcable—stayedbridgemaybegreatlychangedundernon—uniformexcitation.Theinfluenceofthetraveling·wavee
6、ffectoftheearthquakemotionisgreaterthanthepartialcoherenceeffect.Thespatialvariationofseismicgroundmotionisbene—ficialtocable—stayedbridgeunderlongitudinalexcitation,hasalittleinfluenceundertransverseexcita—tionandhasgreatanddisadVantageousinfluenceunderverticalexcitation.Therandomseismicanalysis
7、undermulti—supportearthquakeexcitationsmustbeperformedforthelong—spancable—stayedbridge.[Keywords]cable—stayedbridge;seismicresponse;stochasticvibration;non—uniformexcitation大,必然会带来许多复杂的问题。地震荷载作为0前言大跨结构的主要荷载,是结构设计的控制因素
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