資源描述：
《非一致激勵(lì)下大跨斜拉橋的隨機(jī)地震響應(yīng)分析》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫(kù)。
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(lì)下大跨斜拉橋的隨機(jī)地震響應(yīng)分析吳玉華，郭劍飛，蔡若紅(1．浙江工業(yè)大學(xué)之江學(xué)院，浙江杭州310024；2．杭州市城建設(shè)計(jì)研究院有限公司，浙江杭州310001)[摘要]基于平穩(wěn)隨機(jī)地震動(dòng)場(chǎng)理論，對(duì)大跨度斜拉橋進(jìn)行非一致激勵(lì)下的平穩(wěn)隨機(jī)地震響應(yīng)分析。以金塘大橋主通航孔橋?yàn)檠芯繉?duì)象建立有限元模型，采用多點(diǎn)平穩(wěn)隨機(jī)地震響應(yīng)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(diǎn)激勵(lì)下的地震響應(yīng)．研究了地震動(dòng)的空間變化，包括部分相干效應(yīng)和行波效應(yīng)以及視波速變化對(duì)大跨度斜拉橋地震
2、響應(yīng)的影響。數(shù)值分析結(jié)果表明：非一致激勵(lì)下斜拉橋的內(nèi)力和位移有較大改變，地震動(dòng)的行波效應(yīng)影響比部分相干效應(yīng)的影響更大，地震動(dòng)的空間變化對(duì)縱橋向激勵(lì)有利，對(duì)橫橋向激勵(lì)影響較小，對(duì)豎向激勵(lì)影響很大且不利。對(duì)大跨度斜拉橋，必須進(jìn)行多點(diǎn)地震激勵(lì)的響應(yīng)分析。[關(guān)鍵詞]斜拉橋；地震響應(yīng)；隨機(jī)振動(dòng)；非一致激勵(lì)[中圖分類號(hào)]u442．55[文獻(xiàn)標(biāo)識(shí)碼]A[文章編號(hào)]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(huì)帶來(lái)許多復(fù)雜的問(wèn)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(jì)的控制因素
