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1、橋梁建設(shè)2015年第45卷第2期(總第231期)94BridgeConstruction，Vo1．45，No．2，2015(TotallyNo．231)文章編號：1003—4722(2015)02—0094—05萬州長江三橋橋塔設(shè)計李剛(中鐵大橋勘測設(shè)計院集團(tuán)有限公司，湖北武漢430056)摘要：萬州長江三橋為雙塔混合梁斜拉橋，跨徑布置為(4x57．5+730+4×57．5)m。橋塔采用具有歐式建筑風(fēng)格的鉆石塔型，既減小了水下基礎(chǔ)規(guī)模，又與當(dāng)?shù)亟ㄖ嗟靡嬲?。橋塔由上、中、下塔柱和下橫梁構(gòu)成，南塔高248．12m，北塔高208．2m，兩塔下橫梁以上保持一致。由于地形的限制，南、
2、北塔下塔柱高度相差懸殊，為充分考慮兩塔剛度差的影響，直接在全橋總體模型中進(jìn)行橋塔分析。采取3項措施(對下橫梁進(jìn)行分節(jié)段澆筑、優(yōu)化下塔柱與下橫梁截面及對下塔柱增設(shè)豎向預(yù)應(yīng)力)有效解決了北塔下塔柱與下橫梁形成的橫向框架剛度過大的難題。采,rfl橫向框架桿系模型與節(jié)段細(xì)部實體模型結(jié)合的方法，確定了理想的索塔錨固區(qū)預(yù)應(yīng)力布置形式。受力分析表明，橋塔各構(gòu)件均滿足規(guī)范要求。關(guān)鍵詞：斜拉橋；橋塔；塔型；橫向框架；索塔錨固區(qū)；結(jié)構(gòu)設(shè)計；關(guān)鍵技術(shù)；有限元法中圖分類號：U448．27；U443．38文獻(xiàn)標(biāo)志碼：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
