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时间:2019-05-13
《向莆铁路莆田特大桥右线矮墩大跨连续刚构桥设计》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2012年第42卷第5期(总第215期)BridgeConstruction,Vo1.42,No.5,2012(TotallyNo.215)文章编号:1003—4722(2012)05—0051一O6向莆铁路莆田特大桥右线矮墩大跨连续刚构桥设计蔡华炳(中土集团福州勘察设计研究院有限公司,福建福州350013)摘要:向莆铁路莆田特大桥分左、右2座单线桥跨越福厦高速公路,右线桥采用(87.3+146+87.3)m连续刚构桥。该桥主梁位于小半径平面曲线(R一1600m)上,采用单箱单室直腹板变高箱梁,梁体采用C55高性能混凝土,全梁共设7
2、道横隔板,三向预应力体系。下部中墩采用双柱柔性薄壁墩,墩高仅13m,在墩梁交界处设梗肋,中墩基础均采用8根2.2m钻孔灌注桩;边墩采用矩形截面桥墩,基础均采用u根1.25m钻孔灌注桩。采用软件BSASV4.32和ASCBv4.74、MIDASCiv—il、TB1分别对主桥结构进行平面静力分析、局部应力分析、动力特性及车一桥耦合动力响应分析,分析结果表明:该桥梁体顶、底板正应力和腹板剪应力、墩身受力均能满足规范要求;主桥结构具有良好的动力性及列车走行性,列车通过桥梁时的安全性和乘坐舒适性均能满足要求。关键词:铁路桥;刚构桥;桥梁设计;静力分析
3、;动力分析;有限元法中图分类号:U448.13;U448.23文献标志码:ADesignofRightLineLowPierandLongSpanContinuousRigid—FrameBridgeofPutianBridgeonXiangtang—PutianRailwayCAIHua—bing(CCECCFuzhouSurveyandDesignInstituteCo.,Ltd.,Fuzhou350013,China)Abstract:ThePutianBridgeonXiangtang—PutianRailwayiscomposed
4、oftwosingle—trackbridgesofleftandrightlinesspanningFuzhou~XiamenExpressway.Therightlinebridgeisalowpierandlongspancontinuousrigid—framebridgewithspanarrangement(87.3+146+87.3)mandwithitsmaingirderlocatedatasharpradiusplanecurveofR===1600m.Themaingirderisdesignedasavariable
5、depthgirderhavingsingle—cellsingleboxandverticalwebsandthegirderisusedwithC55highperformanceconcrete.providedwithtotally7diaphragmsandthree—waypre—stressingsystem.Themiddlepierssupportingthegirderarethedouble—columnflexiblethinwallpiersthatareonly13mhigh.Atthejunctionofapi
6、erandthegirder,thehaunchesarearrangedandthefoundationforthepierhas8boredpiles,eachbeing2.2m.Thesidepiersaretherec—tangularsectionpiers.respectivelystandingontheirfoundationsof11boredpiles,eachbeing1.25m.ThesoftwareBSASV4.32,ASCBV4.74,MIDASCivilandTBIareusedtorespec—tivelya
7、nalyzetheplanestaticforce,localstress,dynamiccharacteristicandvehicle—bridgeCOU—plingdynamicresponsesofthemainbridgestructure.Theresultsoftheanalysisindicatethatthenormalstressinthetopandbottomslabsandtheshearstressinthewebsofthemaingirderandtheforceconditionsofthepiershaf
8、tscanallsatisfytherelevantrequirementsinthecodes,thestructurehasgooddynamicandtraintravel
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