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1、橋梁建設(shè)2014年第44卷第3期(總第226期)BridgeConstruction,Vo1.44,No.3,2014(TotallyNo.226)25文章編號(hào):1003—4722(2014)03—0025—07地震作用下高墩橋梁橫向碰撞效應(yīng)研究鄧育林,雷凡,何雄君(武漢理工大學(xué)交通學(xué)院,湖北武漢430063)摘要:為提升高墩大跨連續(xù)剛構(gòu)橋的防震減災(zāi)能力,對(duì)其合理的減震措施進(jìn)行研究。以我國西部山區(qū)強(qiáng)地震帶一座高墩大跨橋梁為例,利用SAP2000Nonlinear有限元程序建立橋梁結(jié)構(gòu)空間非線性計(jì)算模型,分析其橫向地震響應(yīng)規(guī)律
2、及其碰撞效應(yīng)。分析結(jié)果表明:對(duì)于高墩大跨連續(xù)剛構(gòu)橋,在過渡墩墩頂設(shè)置彈性擋塊時(shí),很難實(shí)現(xiàn)對(duì)過渡墩與剛構(gòu)墩地震響應(yīng)的有效控制,且碰撞產(chǎn)生的撞擊力極易使彈性擋塊破壞,從而失去限位功能;在過渡墩墩頂設(shè)置彈塑性擋塊,并選取適當(dāng)?shù)膿鯄K屈服強(qiáng)度,可有效地控制過渡墩、剛構(gòu)墩地震響應(yīng)以及上部結(jié)構(gòu)位移。關(guān)鍵詞:連續(xù)剛構(gòu)橋;高橋墩;橫向剛度;地震響應(yīng);橫向碰撞效應(yīng);擋塊;有限元法中圖分類號(hào):U442.55文獻(xiàn)標(biāo)志碼:AStudyofTransversePoundingEffectofHigh--RisePierRigid—-FrameBridg
3、esUnderActionofEarthquakeDENGYu-lin,LEIFan,HEXiong—jun(SchoolofTransportati0n,WuhanUniversityofTechnology,Wuhan430063,China)Abstract:Toenhancetheabilityoflongspanandhigh—risepiercontinuousrigid—framebridg—asforprotectingagainstearthquakeandmitigatingtheearthquakedi
4、saster,theproperseismicmitigationmeasuresforthebridgeswerestudied.BywayofexampleofabridgeofthesamekindlocatedinthestrongearthquakebeltinthemountainousregioninthewestofChina,thefiniteel—ementprogramSAP2000Nonlinearwasusedtoestablishthespatialnonlineardynamiccalculat
5、ionmodelforthebridge,thetransverseseismicresponselawandthetransversepoundingeffectofthebridgewereanalyzed.Theresultsoftheanalysisrevealthatforthelongspanandhigh—risepiercontinuousrigid—framebridges,itwillbedifficulttoachievetheeffectivecontroloftheseis—micresponses
6、ofthetransitionpiersandrigid—framepiersjustbyarrangingtheelasticretainersontopsofthetransitionpiers,theforcesproducedbythepoundingcanveryeasilydestroythere—tainersandhencecausetheretainerstolosetheirfunctionsofrestraining.Ontopsofthetransi—tionpiers,iftheelastic—pl
7、asticretainersareprovidedandtheproperyieldstrengthoftheretain—ersischosen,theseismicresponsesofthetransitionpiersandrigid—framepiersandthedisplace—mentofthesuperstructurecanbeeffectivelycontrolled.Keywords:continuousrigid-framebridge;high—risepier;transverserigidit
8、y;seismicre—sponse;transversepoundingeffect;retainer;finiteelementmethod1引言工工藝成熟、快捷等特點(diǎn)在我國西部山區(qū)橋梁建設(shè)高墩大跨連續(xù)剛構(gòu)橋以其良好的跨越能力及施中被廣泛采用,而西部山區(qū)是我國的地震多發(fā)區(qū)且收稿日期:2