混凝土悬挑梁的接长改造与加固

[]100228528(2007)0320077203(,400015)[]112m210m310m,,,[];;;;;[]TU32012[]BLengtheningandReinforcementofConcreteCantileverBeamsWANGZuo(EastChinaArchitecturalDesign&ResearchInstituteChongqingDepartment,Chongqing400015,China)[Abstract]Acantileverbeamislengthenedfrom112meterto210meterand310meter.Thereliabilityofconnectionofnewbeamtooldbeamiskeytolengtheningofacantileverbeamwhichisstaticallydeterminatewithnoredundancy.Young2to2oldconcreteinterfaceistheweeklinkofreconstructedstructure.Throughtheanalysisonthefactorsrelatedtobondbehaviorofyoung2to2oldconcrete,thereliabilityofprolongationofcantileverbeamsisensuredbyseveralmeasures.[Keywords]reconstruction;cantileverbeam;bondofyoung2to2oldconcrete;interfacialroughness;self2levelingconcrete;reinforcement[]2006205218[](19732),,,[][e-mail]1,226112m,,256210m310m400mm600mm,C40,210m,,310m,,2,112m210m310m,,,,(1),,,,,,,,,,,[4],(2),,,,23320073BUILDINGSCIENCEVol123,No13Mar.2007,,,,,(3),,,,,,,,,(4),,,,,,,,3112m210m112m210m,65kNm,108kN,,30%,,,311,[1],C40[3],(1):fst=(010113048h+010267976)fcu(1),fst(MPa);fcu(MPa);h(mm),,(1)310,,85kN;,2mm,158kN,108kN,3121,45,,2,(3)123210m:;,,8723,,50%8h,,,,,4112m310m112m310m,,,,(4),UU4310m,,6mm,,,,,,,,,,,,,,[5]GMA,15%,425,20mm,0138,260mm,620mm,500mm75mm,,,GMA,,,,,,5,:(1),,(2),,,(3),,,,(86)973:3,412003712681281881138118812281279115101251(X)2(lwn)(mm)3022301791359472413935()16131214917713511319212211119(mm)1871541281008057353333()1011813619514413311119118118:,1815m3(:mm)4(3),,,5,,,,,,,,,[][1],JGJ125299,[S].[2].()[M].:,2003.5(661).[3]JGJ7922002,[S].(70):,,![][1],,.[J].,2002,(6).[2],.[J].,1997,(11).(79)[][1](CECS25:90)[M].:,1992.[2].[M].:,1997.[3],,,.[J].,2002(8).[4],.[J].,2003(3).[5],.[J].,2004(4).6823