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ID:36505598
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页数:7页
时间:2019-05-11
《大跨高墩小半径刚构连续组合梁桥地震响应分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、桥梁建设2013年第43卷第1期(总第218期)52BridgeConstruction,Vo1.43,No.1,2013(TotallyNo.218)文章编号:1003—4722(2013)01—0052~07大跨高墩小半径刚构一连续组合梁桥地震响应分析揭志羽,卫星,李亚东,顾颖(西南交通大学,四川成都610031)摘要:为研究大跨高墩小半径刚构~连续组合曲线梁桥的地震响应,以某(40+6×8O+40)m的刚构一连续组合梁铁路特大桥为背景进行分析。采用ANSYS建立全桥有限元模型,计算桥梁动力特性,并采用反应谱法和时程分析法对桥梁在地震作用下的内力和位移进行分析。分析结果表
2、明:增大桥墩刚度、采用墩梁固结方式能够提高刚构一连续组合曲线梁桥的整体性,有利于桥梁的抗震;从地震响应(位移、弯矩)综合考虑,对该类桥梁最不利的地震波激励角度为0。、90。(分别对应顺桥向、横桥向),增大横向刚度可减小桥梁结构的横向位移,增大墩底截面面积可减小桥梁结构在水平地震作用下的地震响应;总体上来说,在横桥向地震波激励下该类桥梁横向位移和面外弯矩最大,在顺桥向地震波激励下该类桥梁纵向位移和面内弯矩最大。关键词:组合梁桥;曲线桥;高墩;地震响应;反应谱法;时程分析法;有限元法中图分类号:U442.55文献标志码:AAnalysisofSeismicResponseofLo
3、ngSpan,High-RisePierandShortRadiusCurvedHybridBridgeofRigidFrameandContinuousGirderJIEZhi—yu,WEIXing,LJYa—dong,GUling(SouthwestJiaotongUniversity,Chengdu610031,China)Abstract:Tostudytheseismicresponseofthelongspan,high—risepierandshortradiuscurvedhybridbridgeofrigidframeandcontinuousgirder,
4、arailwaybridgeofthesamestructuraltypewithspanarrangement(40+6×80+40)mwascitedasanexampleandanalyzed.TheAN—SYSwasusedtosetupthefiniteelementmodelforthewholebridgeofthebridge,thedynamicpropertiesofthebridgewerecalculatedandtheinternalforcesanddisplacementundertheseismicactionwereanalyzed,usin
5、gtheresponsespectrummethodandthetime—historyanalysismethod.Theresultsoftheanalysisrevealthattheincreaseofrigidityofthebridgepiersandtheapplica~.tionofrigidfixityofthepiersandgirdercanimprovetheintegralityofthecurvedhybridbridgeofrigidframeandcontinuousgirderandareadvantageoustotheseismicres
6、istance.Incompre—hensiveconsiderationoftheseismicresponse(e.g.displacementandmoment),theworstseismicwaveexcitationanglesofthebridgeofsuchtypeare0。and90。(respectivelycorrespondingtothelongitudinalandtransversedirectionsofthebridge).Theincreaseofthetransverserigiditycandecreasethedisplacement
7、ofthebridgeinthetransversedirectionandtheincreaseofthesectionalareasoffootingsofthepierscanreducetheseismicresponseofthebridgeunderthehorizontalseismicaction.Ingeneral,thetransversedisplacementandout—of—planemomentofthebridgeun—dertheseismicwaveexcitatio
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