大跨度预应力混凝土变截面连续箱梁桥设计

:1003-4722(2003)04-0041-031,1,2(1.,310014;2.,300074):,,,2:;;;;;:U448.215;U442.5:ADesignofLong2SpanPrestressedConcreteContinuousBoxGirderBridgewithVariableCrossSectionSHIYing1,XUANJi2ming1,MAChun2ting2(1.CollegeofArchitecturalEngineering,ZhejiangUniversityofIndustrialTechnology,Hangzhou310014,China;2.NorthChinaDesignandResearchInstituteofChinaMunicipalEngineering,Tianjin300074,China)Abstract:Crackingisaproblemcommonlyseeninlong2spanprestressedconcretecontinuousboxgirder.Withreferencetotherelevantprovisionsinthedesignspecificationsofseveralcountriesintheworld,thispaperpresentsthemattersthatshouldbeconsideredandnoticedinthedesignoflong2spanprestressedconcretecontinuousboxgirderwithvariablecrosssectionandinthehandlingofstructurallayoutinordertomitigatethecrackingtothepossibleminimum,andalsoproposestwokindsoflayoutofverticalprestressingsystems.Keywords:continuousgirderbridge;boxgirder;prestressedconcretestructure;bridgedesign;structure;summarization:2003-02-11:(1963-),,,1984(),1,,,,,(,),,2,,2.1:0.50.8[1],14,,0.550.6[2]1/301/501/151/20[1]2.2,,,,,;,,,,22.2m,,,,,112.32.3.1,,,70%,,,;,,,3040cm,5060cm,,,,222.3.2,,,20cm,,,7j15,,3333.1C50,80%,11MPa[3]BS540020.016.0JTJ023-8517.521.0[4](94)22.522.01,,,4.76%,31.25%;,,[5]ha=0.65Rba(),2420034,,,,2.03.0MPa3.2,,,,;,,,,,DIN1075[6]44.1,,,,,,,,,,,,,,,,,,,,,,4.2,,,,3,,,,,,35,,71.42%;11.42%;40%[7],[8]:(1),,,,,4(a)(2),,,:2,,[4(b)];[4(c)]44.3,,,,,,5,1/3,,,,,,,:[1].[M].:,1988.(50)34,,,55.1,30m,,30m,,,8,,,L50505,,,,,,,,,5.2,,,2,48m,10kN,,,2,,6(1),,;,,;,,(2)32m,45m,,55m(3),,4(4)2,(5),,:[1],.[J].,2001,(4):14-19.[2].[M].:,1988.[3].[M].:,1998.[4],.[J].,1997,(9):8-9.(43)[2],.[R].1998.[3]BS5400,[S].[4](1994)[S].,,,.:,1998.[5].[R].1999.[6][S]..,1997.[7].[R].2001.[8].[R].2002.0520034