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1、橋梁建設(shè)2012年第42卷第5期(總第215期)BridgeConstruction，Vo1．42，No．5，2012(TotallyNo．215)文章編號：1003—4722(2012)05—0051一O6向莆鐵路莆田特大橋右線矮墩大跨連續(xù)剛構(gòu)橋設(shè)計(jì)蔡華炳(中土集團(tuán)福州勘察設(shè)計(jì)研究院有限公司，福建福州350013)摘要：向莆鐵路莆田特大橋分左、右2座單線橋跨越福廈高速公路，右線橋采用(87．3+146+87．3)m連續(xù)剛構(gòu)橋。該橋主梁位于小半徑平面曲線(R一1600m)上，采用單箱單室直腹板變高箱梁，梁體采用C55高性能混凝土，全梁共設(shè)7
2、道橫隔板，三向預(yù)應(yīng)力體系。下部中墩采用雙柱柔性薄壁墩，墩高僅13m，在墩梁交界處設(shè)梗肋，中墩基礎(chǔ)均采用8根2．2m鉆孔灌注樁；邊墩采用矩形截面橋墩，基礎(chǔ)均采用u根1．25m鉆孔灌注樁。采用軟件BSASV4．32和ASCBv4．74、MIDASCiv—il、TB1分別對主橋結(jié)構(gòu)進(jìn)行平面靜力分析、局部應(yīng)力分析、動力特性及車一橋耦合動力響應(yīng)分析，分析結(jié)果表明：該橋梁體頂、底板正應(yīng)力和腹板剪應(yīng)力、墩身受力均能滿足規(guī)范要求；主橋結(jié)構(gòu)具有良好的動力性及列車走行性，列車通過橋梁時(shí)的安全性和乘坐舒適性均能滿足要求。關(guān)鍵詞：鐵路橋；剛構(gòu)橋；橋梁設(shè)計(jì)；靜力分析
3、；動力分析；有限元法中圖分類號：U448．13；U448．23文獻(xiàn)標(biāo)志碼：ADesignofRightLineLowPierandLongSpanContinuousRigid—FrameBridgeofPutianBridgeonXiangtang—PutianRailwayCAIHua—bing(CCECCFuzhouSurveyandDesignInstituteCo．，Ltd．，F(xiàn)uzhou350013，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
