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1、鄂東長江公路大橋結(jié)構(gòu)設(shè)計方案研究常英,詹建輝65文章編號:1003—4722(2011)03—0065—04鄂東長江公路大橋結(jié)構(gòu)設(shè)計方案研究常英,詹建輝(湖北省交通規(guī)劃設(shè)計院,湖北武漢430051)摘要:為研究千米級混合梁斜拉橋結(jié)構(gòu)設(shè)計,以鄂東長江公路大橋為依托,通過結(jié)構(gòu)計算與試驗?zāi)M,從鋼一混凝土結(jié)合段位置的選擇、索距、橋塔、主梁、主梁鋼一混凝土結(jié)合段等方面對該橋結(jié)構(gòu)設(shè)計方案進行研究。結(jié)果表明:鋼一混凝土結(jié)合段設(shè)置在中跨側(cè)距橋塔中心12.5m處,結(jié)合段位置主梁的變形和內(nèi)力均較小;中跨標準梁段宜采用15m索距,邊跨宜采用7.5m索距;
2、該橋橋面以上塔高為180.5m;索塔錨固形式采用鋼錨箱方案,并設(shè)置弧形預(yù)應(yīng)力筋減少和控制主橋索塔錨固區(qū)外壁裂縫;主梁采用PK斷面,可充分發(fā)揮全截面的性能;采用優(yōu)化的“混凝土后設(shè)承壓板”的鋼一混凝土結(jié)合段型式,應(yīng)力和剛度過渡較為平順。關(guān)鍵詞:鄂東長江公路大橋;斜拉橋;混合梁;鋼一混凝土結(jié)合段;索距;橋塔;主梁;橋梁設(shè)計中圖分類號:U448.27;U442.5文獻標志碼:AStudyofStructuralDesignSchemesforEdongChangjiangRiverHighwayBridgeCHANGling,ZHANJian
3、—hui(HubeiProvincialTransportPlanningandDesignInstitute,Wuhan430051,China)Abstract:Tostudythestructuraldesignofhybridgirdercable—stayedbridgeshavingspanlengthlongerthan1000m,theEdongChangjiangRiverHighwayBridgewascitedasanexampleandthroughstructuralcalculationandtesting
4、simulation,thestructuraldesignschemesforthehighwaybridgewerestudiedfromseveralaspectsofselectionofthesteelandconcretejointsec—tionlocations,cablespacing,pylons,maingirderandsteelandconcretejointsectionsofthegird—er.Theresultsofthestudyindicatethatifasteelandconcretejoin
5、tsectionislocatedonthesideofthecentralspanatadistanceof12.5mtothecenterofapylon。thedeformationandinternalforceinthemaingirderatthejointsectionwillbelittle.Thestaycablespacingonthetypicalsegmentsofthecentralspanshouldbepreferably15mwhileonthesegmentsofsidespansshouldbe7.
6、5m.Theheightofpylonsofthebridgeabovethedeckis180.5m.Thesteelanchorboxesareusedfortheanchorageinthepylonsandthearcprestressingtendonsarearrangedtore—duceandcontrolcrackingintheexternalwallsoftheanchoragezones.Themaingirderisde—signedasthePK(Pasco—KennewickBridge)crosssec
7、tionthatcanbringtheperformanceoftotalcrosssectionintofullplay.Theoptimizedsteelandconcretejointsectionsof“settingcompres—sionplatesbehindconcrete”areadoptedandthetransitionofstressandrigiditythereissmooth.Keywords:EdongChangjiangRiverHighwayBridge;cable—stayedbridge;hyb
8、ridgirder;steelandconcretejointsection;cablespacing;pylon;maingirder;bridgedesign收稿日期:2011—02—18作者筒介:常英(1975一)