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1、長(zhǎng)沙理工大學(xué)碩士學(xué)位論文大跨長(zhǎng)聯(lián)PC連續(xù)梁橋地震反應(yīng)分析姓名:夏培華申請(qǐng)學(xué)位級(jí)別:碩士專(zhuān)業(yè):橋梁與隧道工程指導(dǎo)教師:余錢(qián)華20090401摘要隨著國(guó)家經(jīng)濟(jì)的發(fā)展,大跨度橋梁在我國(guó)得到了很快的發(fā)展,其中大跨度連續(xù)梁橋是應(yīng)用最廣泛的橋型之一。我國(guó)是一個(gè)多地震的國(guó)家,因此,對(duì)作為生命線(xiàn)工程的橋梁結(jié)構(gòu)特別是大跨度橋梁結(jié)構(gòu)在地震作用下的反應(yīng)作深入細(xì)致的分析是必需也是非常必要的。本文以常德漢壽沅水大橋?yàn)楣こ瘫尘?,在?jiǎn)述地震反應(yīng)分析基本理論的基礎(chǔ)上,對(duì)八跨一聯(lián)預(yù)應(yīng)力混凝土連續(xù)梁橋進(jìn)行了地震反應(yīng)譜分析和動(dòng)態(tài)時(shí)程分析。主要研究?jī)?nèi)容包括以下幾個(gè)方面:1.通過(guò)建立三維空間有限元分析模型,對(duì)常德漢壽沅水
2、大橋主橋進(jìn)行了自振特性分析。2.根據(jù)橋址處的場(chǎng)地特點(diǎn),研究探討了樁.土結(jié)構(gòu)相互作用對(duì)橋梁結(jié)構(gòu)地震反應(yīng)的影響。3.應(yīng)用反應(yīng)譜法對(duì)大跨長(zhǎng)聯(lián)連續(xù)梁橋進(jìn)行了地震反應(yīng)分析并討論了幾種設(shè)計(jì)參數(shù)對(duì)橋梁地震響應(yīng)的影響。4.應(yīng)用動(dòng)態(tài)時(shí)程分析法對(duì)大跨長(zhǎng)聯(lián)連續(xù)梁橋進(jìn)行了一致激勵(lì)地震響應(yīng)分析并與反應(yīng)譜結(jié)果進(jìn)行了對(duì)比。5.通過(guò)輸入不同波速的地震波,計(jì)算行波激勵(lì)下橋梁的地震反應(yīng),并和一致激勵(lì)下的結(jié)果進(jìn)行對(duì)比,分析行波效應(yīng)對(duì)橋梁地震反應(yīng)的影響。6.根據(jù)漢壽沅水的特點(diǎn),確定連續(xù)梁橋減隔震裝置的布置方案,討論了不同的減隔震方案對(duì)橋梁地震反應(yīng)的影響,提出了連續(xù)梁橋較優(yōu)的減隔震設(shè)計(jì)方案。同時(shí)對(duì)粘滯阻尼器主要設(shè)計(jì)參數(shù)進(jìn)
3、行了探討,分析了主要設(shè)計(jì)參數(shù)對(duì)結(jié)構(gòu)地震響應(yīng)的影響。關(guān)鍵詞:連續(xù)梁橋;地震反應(yīng)分析;樁一土相互作用;行波效應(yīng);減隔震ABSTRACTAlongwiththenationaleconomy’sdevelopment,thelongspanbridgeisdevelopingquicklyinourcountry,andthelongspancontinuousbeambridgeisoneofthemostwidelyapplicationbridgetypes·ourcountrylsmuti.seismal,therefore,thebridgeconstructasthelif
4、clineproject,especiallythelongspanbridgeconstruct,itisnecessaryandessentialtomakeadetailedanddeeplyanalyzethereactionofearthquakeeffect.Inthispaper,tkaingChangdeHanshouYhanshuiBridgeasanexample,basedonthebasictheorcoftheseismicresponseanaIysis,twomethodsincludingspectrumresponseanalysisandtim
5、e-historyanalysisofearthquakeareappliedtoaPCcontinuousbeambridgeofoneunitwith8spans.Themainresearchcontentsincludethefbllowing:1.Establish3.dimensionalf_initeelementmodelsandcalculatethesel.vibrationcharacteristicofthebridge.2.Consideringintotheinfluenceofthepile—so訂interactiontotheseismicres
6、ponseofthebridgebasedonthecharacteristicofthesitesoilofthebridge.3.Carryouttheseismicresponseanalysistothelongspancontinuousbeambridgeusingresponsespectrummethodanddiscusstheinfluencesofseveralkindsofdesignparameterstoseismic.responseofthebridge·4.Carryoutthecoincidentearthquakeexcitationanal
7、ysistothelongspancontinuousbeambridgeusingdynamictimehistorymethodandcompareitwithresponsespectrumresult.5.CalculatetheseismicresponseofthebridgewithtraVellingwaVeeffectbyinputingdifferentVelocitiesofseismicwaVe,comparewiththeresultsunderthec