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《梁柱效應(yīng)對(duì)大跨度斜拉橋地震響應(yīng)的影響研究》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。
1、公路交通技術(shù)2014年8月第4期TechnologyofHighwayandTransportAug.2014No.4梁柱效應(yīng)對(duì)大跨度斜拉橋地震響應(yīng)的影響研究馮俊杰,尹冠生(長安大學(xué)理學(xué)院,西安710064)摘要:斜拉橋是高柔度超靜定結(jié)構(gòu),具有強(qiáng)烈的幾何非線性行為。以一大跨度斜拉橋?yàn)槔?,使用MIDAS/civil2012有限元軟件建立三維有限元?jiǎng)恿τ?jì)算模型,并對(duì)其動(dòng)力特性進(jìn)行分析。在此基礎(chǔ)上,建立模型A(不考慮梁柱效應(yīng))和模型B(考慮梁柱效應(yīng)),其均考慮斜拉索的垂度效應(yīng)和結(jié)構(gòu)的大變形效應(yīng)。參考JTG/TB02—01.2伽8《公路橋梁抗震設(shè)計(jì)細(xì)則》提供的反應(yīng)譜數(shù)據(jù),采用C
2、QC振型組合方法對(duì)上述2組模型進(jìn)行地震仿真分析并對(duì)其位移和內(nèi)力進(jìn)行比較。結(jié)果表明:梁柱效應(yīng)對(duì)大跨度斜拉橋的動(dòng)力特性有較大影響;由于梁柱效應(yīng),在地震作用下結(jié)構(gòu)的位移和內(nèi)力都有所增大,且縱橋向+豎向的地震作用比橫橋向+豎向地震作用結(jié)構(gòu)的梁柱效應(yīng)明顯。研究結(jié)論可為以后大跨度斜拉橋動(dòng)力分析提供理論依據(jù)。關(guān)鍵詞:斜拉橋;梁柱效應(yīng);動(dòng)力特性;反應(yīng)譜文章編號(hào):1009—6477(2014)04—0049—05中圖分類號(hào):U448.27文獻(xiàn)標(biāo)識(shí)碼:AResearchonInfluencesOfBeam—columnEfectOnSeismicResponseOfLarge-spanCa
3、ble-stayedBridgesFENGJunjie.YINGuanshengAbstract:Thecable—stayedbridgesarehigh—flexibilityandhyperstaticstructuresandhavestronggeometricalnon—linearbehavior.Withalarge—spancable—stayedbridgeasanexample,thispaperestablishesadefiniteelementdynamiccalculationmodelwithMIDAS/civil2012definite
4、elementsoftwareandanalyzesitsdynamicproperties.OnthisbasisthepaperconstructsmodelA(notconsideringthebeam—columneffect)andmodelB(consideringthebeam-columneffect),bothofwhichconsiderthesageffectofstayedcablesandthelargedeformationeffectofstructures.Byreferencetotheresponsespectrumdataprovi
5、dedinJTG/TB02-01-2008“RulesforSeismicDesignofHighwayBridges”,thepaperconductsseismicsimulationanalysisfortheabovetwomodelsbymeansofCQCvibrationtypecombinationmethodandcomparestheirdisplacementsandinternalstresses.Theresultsshowthatthebeam-columneffecthasbiginfluencesondynamicpropertiesof
6、large-spancable-stayedbridges;bothdisplacementandinternalforceofstructuresincreaseduetothebeam-columneffect,andthebeam-columneffectonearthquakeaffectedstructuresinlongitudinaldirection+verticaldirectionismoreobviousthanthatintransversedirection+verticaldirection.Theresearchconclusioncanp
7、rovidetheoreticalbasisfordynamicanalysisoflarge—spancable-stayedbridgesinthefuture.Keywords:cable-stayedbridge;beam-columneffect;dynamicproperty;responsespectrum近年來,大跨度斜拉橋的建設(shè)越來越多。然而,反應(yīng)特性,故對(duì)斜拉橋自振特性進(jìn)行分析意義重隨著斜拉橋向長、輕、柔方向發(fā)展,其對(duì)行車荷載、風(fēng)大。荷載、地震荷載等動(dòng)力荷載更加敏感,因此,需要進(jìn)斜拉橋是由橋塔、主梁、斜拉索構(gòu)成的組合結(jié)