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时间:2020-03-25
《高地震烈度区含矮墩桥梁抗震设计.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第29卷第4期2012年4月公路交通科技JournalofHighwayandTransportationResearchandDevelopmentV01.29No.4Apr.2012.doi:10.3969/j.issn.1002-0268.2012.04.012.._JI一口同地震烈度区含矮墩桥梁抗震设计李晓莉,孙治国,王东升(大连海事大学道路与桥梁工程研究所,辽宁大连116026)摘要:针对高烈度区矮墩在地震中易发生脆性剪切破坏问题,结合《公路桥梁抗震设计细则(JTG/TB20—01--2008)》,提出了含矮墩桥梁抗震设计对策。以高烈度区
2、某两跨简支预应力混凝土T梁桥为例.分别提出了减隔震技术、多柱墩设计、采用复合短柱(FRP或钢套管)或高强度抗剪箍筋等具体方案和建议。利用专业MIDAS有限元软件建立减隔震、多柱墩设计方案数值分析模型,比较了在E2地震作用下各个设计方案中桥墩及桩基础纵、横向最大受力情况。结果表明,采用减隔震设计或多柱墩设计方案可有效降低矮墩及基础的地震需求,改善矮墩及基础在强震作用下的受力性能,适用于高烈度区矮墩桥梁的抗震设计。上述方案主要供设计人员在抗震概念设计阶段选用,以切实提高含矮墩桥梁抗震能力。关键词:桥梁工程;矮墩;MIDAS有限元;抗震设计;减隔震技术;
3、多柱墩中图分类号:U442.5+5文献标识码:A文章编号:1002—0268(2012)04—0067—05SeismicDesignforBridgeswithShortPiersinHighEarthquakeIntensityZonesLIXiaoli,SUNZhiguo,WANGDongsheug(InstituteofRoadandBridgeEngineering,DalianMaritimeUniversity,DalianLiaoning116026,China)Abstract:Aimedattheshortbridgepiers
4、thatarevulnerabletobrittleshearfailureinhighearthquakeintensityzones,theseismicdesigncountermeasuresforbridgeswithshortpiersWasputforwardcombinedwithGuidelinesforSeismicDesignofHighwayBridges(JTG/TB02—0l_2008).Basedonadesignedsimpletwo—spanprestressedconcreteT-beambridgelocate
5、dinahighearthquakeintensityzone,thespecificschemesandsuggestions,includingseismicisolationtechnology,multi—columnpierdesign,compositeshortcolumn(FRPorsteeltube)orhighstrengthtransversereinforcement,wereproposedrespectively.Byusingthenumericalanalysismodelforseismicisolationand
6、multi—columnpierdesignschemeestablishedbyspecialfiniteelementsoftwareMIDAS,themaximumlongitudinalandlateralloadsofthebridgepiersandpilefoundationsofdifferentdesignsunderE2earthquakeexcitationwerecompared.Itisfoundthattheseismicdemandofshortpiersandfoundationscouldbedecreasedsi
7、gnificantlyforthebridgesbyusingseismicisolationdesignormulti-columnpierdesignsuitableforseismicdesignofbridgewithshortpiersinhighearthquakeintensityzones,andthemechanicalbehaviorsofshortpiersandfoundationsunderstrongearthquakecouldbeimproved.Theproposeddesignschemescouldbesele
8、ctedbydesignersintheseismicconceptdesignstagetoimprovetheseis
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