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1、橋梁建設(shè)２０１７年第４７卷第２期（總第２４３期）BridgeConstruction，Vol．４７，No．２，２０１７（TotallyNo．２４３）７文章編號(hào)：１００３－４７２２（２０１７）０２－０００７－０６沌口長(zhǎng)江公路大橋主橋設(shè)計(jì)關(guān)鍵技術(shù)馮鵬程，付坤，陳毅明（中交第二公路勘察設(shè)計(jì)研究院有限公司，湖北武漢４３００５６）摘要：沌口長(zhǎng)江公路大橋主橋?yàn)橹骺纾罚叮癿的半飄浮體系雙塔雙索面PK鋼箱梁斜拉橋，是長(zhǎng)江上首座雙向８車道高速公路特大橋，主梁全寬達(dá)４６m。針對(duì)該橋?qū)挿?、大跨及重載交通等特點(diǎn)，設(shè)計(jì)中對(duì)結(jié)構(gòu)約束體系、主梁剪力滯效應(yīng)、鋼橋面抗疲勞性能、橋塔橫向受力等關(guān)鍵技術(shù)問(wèn)題進(jìn)行研究
2、。提出采用大噸位“彈性＋阻尼”復(fù)合式新型阻尼器對(duì)結(jié)構(gòu)總體約束體系進(jìn)行優(yōu)化；采用帶中縱腹板的PK箱形斷面并適當(dāng)增加梁高，以弱化寬幅主梁的剪力滯效應(yīng)；利用小型智能焊接機(jī)器人實(shí)現(xiàn)鋼橋面板與縱向U肋的雙面角焊縫連接；對(duì)橫隔板處U肋過(guò)焊孔疲勞細(xì)節(jié)構(gòu)造進(jìn)行優(yōu)化；對(duì)外側(cè)２個(gè)車道正交異性鋼橋面板的橫橋向局部剛度進(jìn)行加強(qiáng)；通過(guò)在橋塔中塔柱設(shè)置橫向預(yù)拱改善橋塔橫向受力。關(guān)鍵詞：斜拉橋；寬幅鋼箱梁；復(fù)合式阻尼器；剪力滯；抗疲勞性能；U肋雙面焊；塔柱橫向預(yù)拱中圖分類號(hào)：U４４８．２７；U４４２．５文獻(xiàn)標(biāo)志碼：AKeyTechniquesofDesignofMainBridgeofZhuankouCha
3、ngjiangRiverHighwayBridgeFENGPengcheng，F(xiàn)UKun，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
