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时间:2019-02-04
《多跨混凝土连续梁桥隔震措施研究》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、学兔兔www.xuetutu.com桥梁建设2014年第44卷第2期(总第225期)32BridgeConstruction,Vo1.44,No.2,2014(TotallyNo.225)文章编号:1003—4722(2014)02—0032—06多跨混凝土连续梁桥隔震措施研究许莉,祁皑(福州大学土木工程学院,福建福州350108)摘要:采用合适的隔震措施是改善多跨连续梁桥固定墩承受过大地震力作用的有效方法。以某六跨混凝土连续梁桥为工程背景,通过有限元软件ANSYS计算分析,在该桥中间墩处分别设摩擦摆支座和减震球型支座2种隔震体系,研究2种隔震体系对桥
2、梁地震响应的影响规律。结果表明:2种隔震措施均能有效地降低顺桥向桥墩内力和位移,因此隔震体系与抗震体系相比受力更为合理;从支座的竖向承载力和回复刚度等方面考虑,摩擦摆支座具有显著的优点,因此建议此类连续梁桥采取隔震措施时采用摩擦摆支座。关键词:连续梁桥;隔震措施;减震球型支座;摩擦摆支座;地震响应;动力分析;有限元法中图分类号:U448.21;TU352.12文献标志码:AStudyofSeismicIsolationMeasuresforMulti-SpanConcreteContinuousGirderBridgeXULi,QIA£(Schoolo
3、fCivilEngineering,FuzhouUniversity,Fuzhou350108,China)Abstract:Totaketheproperseismicisolationmeasuresforthefixedpiersofmulti—spancon—cretecontinuousgirderbridgeisaneffectivewaytoimprovethepierssubjectedtotheactionofseismicforce.Inthispaper,asix—spanconcretecontinuousgirderbridg
4、ewascitedasanexampleandbymeansofthefiniteelementsoftwareANSYS,twokindsoftheseismicisolationsystemsofthefrictionpendulumbearingsandseismicmitigationsphericalbearingsrespectivelyarrangedontheintermediatepiersofthebridgewerecalculatedandanalyzedandthelawsofinfluencesofthetwokindsof
5、thesystemsontheseismicresponsesofthebridgewerestudied.Theresultsofthestudyindicatethatthetwokindsofthesystemscaneffectivelyreducetheinternalforcesanddis—placementofthepiersinthelongitudinaldirectionofthebridge.Incomparisonwiththeseismicresistantsystem,theforceconditionsoftheseis
6、micisolationsystemaremorereasonableandinconsiderationoftheverticalbearingcapacityandresilientstiffnessofthebearings,thefrictionpendulumbearingshaveobviousadvantageanditisthereforeproposedthatthependulumbear—ingsshouldbeselectedforsuchtypeofthebridgeswheretheseismicisolationmeasu
7、resarere—quiredtobetaken.Keywords:continuousgirderbridge;seismicisolationmeasure;seismicmitigationsphericalbearing;frictionpendulumbearing;seismicresponse;dynamicanalysis;finiteelementmethod1引言的特点,在我国有着广泛的应用。但是对于连续梁多跨混凝土连续梁桥具有结构刚度大、变形小桥来说,绝大多数上部结构的地震作用都是由固定收稿日期:2O13一¨一05收稿日期:福州大
8、学科技发展基金(2013一XQ-36);福州市科技计划项目(2012一G一130)Scienc
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