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1、第38卷,第3期公路工程Vo1.38.No.32013年6月HighwayEngineeringJun.,2013非一致激勵下大跨斜拉橋的隨機地震響應分析吳玉華,郭劍飛,蔡若紅(1.浙江工業(yè)大學之江學院,浙江杭州310024;2.杭州市城建設(shè)計研究院有限公司,浙江杭州310001)[摘要]基于平穩(wěn)隨機地震動場理論,對大跨度斜拉橋進行非一致激勵下的平穩(wěn)隨機地震響應分析。以金塘大橋主通航孔橋為研究對象建立有限元模型,采用多點平穩(wěn)隨機地震響應分析方法,數(shù)值仿真了該斜拉橋在縱橋向、橫橋向和豎向多點激勵下的地震響應.研究了地震動的空間變化,包括部分相干效應和行波效應以及視波速變化對大跨度斜拉橋地震
2、響應的影響。數(shù)值分析結(jié)果表明:非一致激勵下斜拉橋的內(nèi)力和位移有較大改變,地震動的行波效應影響比部分相干效應的影響更大,地震動的空間變化對縱橋向激勵有利,對橫橋向激勵影響較小,對豎向激勵影響很大且不利。對大跨度斜拉橋,必須進行多點地震激勵的響應分析。[關(guān)鍵詞]斜拉橋;地震響應;隨機振動;非一致激勵[中圖分類號]u442.55[文獻標識碼]A[文章編號]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,必然會帶來許多復雜的問題。地震荷載作為0前言大跨結(jié)構(gòu)的主要荷載,是結(jié)構(gòu)設(shè)計的控制因素