万州长江三桥桥塔设计

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1、桥梁建设2015年第45卷第2期(总第231期)94BridgeConstruction，Vo1．45，No．2，2015(TotallyNo．231)文章编号：1003—4722(2015)02—0094—05万州长江三桥桥塔设计李刚(中铁大桥勘测设计院集团有限公司，湖北武汉430056)摘要：万州长江三桥为双塔混合梁斜拉桥，跨径布置为(4x57．5+730+4×57．5)m。桥塔采用具有欧式建筑风格的钻石塔型，既减小了水下基础规模，又与当地建筑相得益彰。桥塔由上、中、下塔柱和下横梁构成，南塔高248．12m，北塔高208．2m，两塔下横梁以上保持一致。由于地形的限制，南、

2、北塔下塔柱高度相差悬殊，为充分考虑两塔刚度差的影响，直接在全桥总体模型中进行桥塔分析。采取3项措施(对下横梁进行分节段浇筑、优化下塔柱与下横梁截面及对下塔柱增设竖向预应力)有效解决了北塔下塔柱与下横梁形成的横向框架刚度过大的难题。采,rfl横向框架杆系模型与节段细部实体模型结合的方法，确定了理想的索塔锚固区预应力布置形式。受力分析表明，桥塔各构件均满足规范要求。关键词：斜拉桥；桥塔；塔型；横向框架；索塔锚固区；结构设计；关键技术；有限元法中图分类号：U448．27；U443．38文献标志码：ADesignofPylonsofThirdWanzhouChangjiangRive

3、rBridgeLIGang(ChinaRailwayMajorBridgeReconnaissance＆．DesignGroupCo．，Ltd．，Wuhan430056，China)Abstract：TheThirdWanzhouChangjiangRiverBridgeisadouble—pylonhybridgirdercable—stayedbridgewithspanarrangement(4×57．5+730+4×57．5)m．Thepylonsofthebridgearethediamond—shapepylonsfeaturingtheEuropeanarchi

4、tecturestyle．Thepylonsofsuchkindnotonlyreducethescalesoftheirunderwaterfoundations，butalsoareingoodharmonywiththear-chitecturalenvironmentnearbythebridgesite．Thepylonsaremadeupoftheupper，middleandlowercolumnsandlowercrossbeams．Thesouthpylonis248．12mhigh，thenorthpylonis208．2mhighandabovethel

5、owercrossbeams，thedesignofthetwopylonsiskeptidentica1．Restrictedbythetopographyatthebridgesite，theheightdifferencebetweenthelowercolumnsofthesouthandnorthpylonsisgreatandthedesignofthepylonsishencedifficult．Tothoroughlyconsidertherigiditydifferenceinfluencesofthetwopylonsinthedesign，thepylo

6、nswereanalyzeddirectlyintheglobalmodelofthewholebridge．Threemeasures(e．g．concretingthelowercrossbeamsinsegments，optimizingCROSSsectionsofthelowercolumnsandlowercrossbeamsandaddingverti—calprestressingtothelowercolumns)weretakenandtheproblemthattherigidityofthetrans—verseframeformedbythelowe

7、rcolumnsandlowercrossbeamofthenorthpylonwastoogreatwaseffectivelyresolved．Besides，theidealprestressinglayoutintheanchoragezonesinthepylonswasdetermined，usingthemethodcombiningthelinkmodelofthetransverseframesandthesolidmodelofthesegmentdetails．Theanalysi