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1、公路交通科技第卷上承式大跨度鋼管混凝土拱橋地震反應(yīng)分析張波1,李術(shù)才1,楊學(xué)英2,孫國富1,葛顏慧1,魏建軍3,李傳夫1(山東大學(xué)巖土與結(jié)構(gòu)工程研究中心,山東濟南250061)(山東城市建設(shè)職業(yè)學(xué)院,山東濟南250014)(中國礦業(yè)大學(xué),江蘇徐州221008)摘要:為研究上承式大跨度鋼管混凝土拱橋的地震反應(yīng)性能,以大型有限元計算軟件ANSYS為平臺,分別以縱向+豎向和橫向+豎向遷安波與EICentro波作為輸入地震波,對跨徑為430m的上承式鋼管混凝土拱橋——支井河特大橋進行了地震反應(yīng)分析。研究結(jié)果表明:前10階振動以
2、側(cè)向振動為主,表明橋縱向剛度遠(yuǎn)大于側(cè)向剛度;拱肋抗震設(shè)計最危險截面是拱腳截面,地震反應(yīng)內(nèi)力最大;橫向+豎向地震動輸入時拱肋軸力及彎矩Mz略大于縱向+豎向地震動輸入時,相差幅度不大,但橫向+豎向地震動輸入時彎矩My遠(yuǎn)大于縱向+豎向地震動輸入;在橫向+豎向地震動輸入下最危險截面――拱腳處的地震反應(yīng)軸力內(nèi)側(cè)拱肋大于外側(cè)拱肋。關(guān)鍵詞:橋梁工程;地震反應(yīng)分析;ANSYS;上承式鋼管混凝土拱橋;支井河特大橋中圖分類號:U448.22文獻標(biāo)識碼:ATheSeismicResponseAnalysisofDeck-typeLong-S
3、panCFSTArchBridgeZHANGBo1,LiShu-cai1,YANGXue-ying2,SUNGuo-fu1,GEYan-hui1,WEIJian-jun3,LIChuan-fu1(GeotechnicalandStructuralEngineeringResearchCenter,ShandongUniversity,Jinan250061,China)(ShandongUrbanConstructionVocationalCollege,Jinan250014,China)(ChinaUniversi
4、tyofMiningandTechnology,Xuzhou,221008,China)Abstract:Inordertostudytheseismicresponseofdeck-typelongspanCFST(concretefilledsteeltube)archbridge,thedeck-typeCFSTarchbridge—ZhijingheGreatBridgewith430mspanwasanalyzedwithcomputationprogramANSYS,whichtheQiananseismi
5、cwaveandEICentrowaveweretakenastheinputwaves.Theresultsshowthatmostvibrationsinthefirst10stepsareinthecrossdirectionofbridgewhichindicatesthatstiffnessinlengthwisedirectionofbridgeislargerthanthatincrossdirectionofbridge.Thesectionatarchspringingisthemostdangero
6、ussectioninseismicresponsewhichhasthelargestseismicresponsememberforces.Althoughtheaxial-forceandmomentMzofarchribwithcross+verticaldirectionsinputseismicwavesarealittlelargerthanthosewithlengthwise+verticaldirectionsinputseismicwaves,themomentMywithcross+vertic
7、aldirectionsinputseismicwavesaremorelargerthanthosewithlengthwise+verticaldirectionsinputseismicwaves.Theaxial-forcesofinnerarchribatthemostdangeroussection—archspringingwithcross+verticaldirectionsinputseismicwavesarelargerthanthoseofoutarchrib.Keywords:bridgee
8、ngineering;seismicresponseanalysis;ANSYS;deck-typeCFSTarchbridge;zhijingrivergreatbridge公路交通科技第卷0引言鋼管混凝土拱橋的首次應(yīng)用是1937年前蘇聯(lián)在列寧格勒用集束小直徑鋼管混凝土做拱肋建造了跨經(jīng)為110m的拱梁組合橋,自從1990年我國建