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1,2(1.,110015;2.,100016):100m,:;;;:U448.215;U445.72:A:1671-7767(2010)03-0064-033(),,,,(zxy@6)1,(65.94+100+65.94)m,1,,12.75m(C50),,2.3~5.5m30~70cm,30cm,40~60cm2,;;1997,-20,-1001220085,,,,15t,,20086,:(1),,10cm,1/44cm(2),~5,~,6mm,,,,4m,(3),-20,,27.3mm,30mm,0.90,(4),10%,3,[1]3.13.1.11997,10,,,,,;,,,,,%36420103:2010-04-0:1972-1994Email:hanginu200012.com200cm0.10.4mm0.920.1.2,,,,,,6m8cm3.1.3,,,,,3.2,,MIDAS,232310;20%;6m8cm;-2011,,1/cm/MPa101.10.4620%5.22.206m1.10.45355,,8.4cm,3.58MPa10cm,4,[2][3]4.14.1.1,C50,25cm35cm47cm,(),,,4.1.2,219s15.2mm,1860MPa75%,193.9kN,2,,,(),,,;,,,,4.1.3s5,,6M65%,5N65,8cm-201.00.448.4.:221.2mm102170Pa10.9k,,,,,4.1.40.15mm,0.15mm,4.2,MIDAS,2,2/cm/MPa1.30.55-3.8-1.42-6.1-2.32-8.6-3.195,,,3,:1/4,7.6cm3.4cm;,,,,:[1],,,.PC[J].,2006,(2):14-17.[2],,.[J].,2005,(Z1):94-96.[3],.[J].,2001,31(1):109-113.HandlingofDeteriorationsofaPrestressedConcreteContinuousBoxGirderBridgeinShenyangCityZHANGXinyu1,ZHANGXingyun2(1.ShenyangMunicipalEngineeringDesignandResearchInstitute,Shenyang110015,China;2.BeijingJiandaRoadandBridgeConsultingCo.,Ltd.,Beijing100016,China)Abstract:Thedeteriorationsofathreespanprestressedconcretecontinuousboxgirderbridgewithvariablecrosssectionandhavingamainspanof100minShenyangCityweredetectedthroughthevisualinspectionandstaticloadtests.Thecausesleadingtothedeteriorationswereanalyzedindetailbythefiniteelementprogramandthebridgewasthenstrengthenedbythemethodofincreasingthewebthicknessandaddingtheexternalandinternalprestressingstrands.Theinspectionandoperationofthebridgeafterstrengtheningprovedthatthestrengtheningmethodpreparedforthebridgewasfeasibleandeffective.Keywords:continuousgirderbridge;boxgirder;cracking;bridgestrengthening6620103