沌口长江公路大桥主桥设计关键技术.pdf

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1、桥梁建设２０１７年第４７卷第２期（总第２４３期）BridgeConstruction，Vol．４７，No．２，２０１７（TotallyNo．２４３）７文章编号：１００３－４７２２（２０１７）０２－０００７－０６沌口长江公路大桥主桥设计关键技术冯鹏程，付坤，陈毅明（中交第二公路勘察设计研究院有限公司，湖北武汉４３００５６）摘要：沌口长江公路大桥主桥为主跨７６０m的半飘浮体系双塔双索面PK钢箱梁斜拉桥，是长江上首座双向８车道高速公路特大桥，主梁全宽达４６m。针对该桥宽幅、大跨及重载交通等特点，设计中对结构约束体系、主梁剪力滞效应、钢桥面抗疲劳性能、桥塔横向受力等关键技术问题进行研究

2、。提出采用大吨位“弹性＋阻尼”复合式新型阻尼器对结构总体约束体系进行优化；采用带中纵腹板的PK箱形断面并适当增加梁高，以弱化宽幅主梁的剪力滞效应；利用小型智能焊接机器人实现钢桥面板与纵向U肋的双面角焊缝连接；对横隔板处U肋过焊孔疲劳细节构造进行优化；对外侧２个车道正交异性钢桥面板的横桥向局部刚度进行加强；通过在桥塔中塔柱设置横向预拱改善桥塔横向受力。关键词：斜拉桥；宽幅钢箱梁；复合式阻尼器；剪力滞；抗疲劳性能；U肋双面焊；塔柱横向预拱中图分类号：U４４８．２７；U４４２．５文献标志码：AKeyTechniquesofDesignofMainBridgeofZhuankouCha

3、ngjiangRiverHighwayBridgeFENGPengcheng，FUKun，CHENYimin‐g‐（CCCCSecondHighwayConsultantsCo．，Ltd．，Wuhan４３００５６，China）Abstract：ThemainbridgeoftheZhuankouChangjiangRiverHighwayBridgeisasemi‐float‐ingsystemPK（Pasco‐KennewickBridge）sectionsteelboxgirdercable‐stayedbridgewithdoublepylons，doublecablep

4、lanesandwithamainspanof７６０m．Thebridgeisthefirstexpresswaybridgethatistocarrydualfourlanesandthathasthetotaldeckwidthof４６movertheChangjiangRiver．Inthelightofthecharacteristicsofthewidedeck，longspanandheavytrafficloadofthebridge，thekeytechniquesofthegeneralconstraintsystemofthestructure，shearl

5、ageffectofthemaingirder，fatigueperformanceoftheorthotropicsteeldeckandthetransverseforcesofthepy‐lonshavebeenresearchedinthedesign．Theoptimizingoftheconstraintsystemofthestructure，usingthenewtypeoftheheavyload“spring＋damping”compositedampers，isproposed．Toweakentheshearlageffectofthewidedeck，

6、thePKsectionboxgirderwiththecentrallongitudi‐nalwebsischosenandthedepthofthegirderisappropriatelyincreased．Thetwo‐sidefilletweldjointsconnectingthesteeldeckplatesandthelongitudinalUribsaretoberealized，usingthesmallsmartweldingrobots．ThefatiguedetailsofthecutoutsoftheUribsatthediaphragmsareop

7、timized，thetransverselocalstiffnessofthesteeldecksofthetwolanesattheoutersidesarere‐inforcedandbysettingthetransverseprecamberingonthemiddlecolumnsofthepylons，thetransverseforcesofthepylonsaretobeimproved．Keywords：cable‐stayedbridge；widesteelboxgir