预应力混凝土建筑施工事故案例分析

:2004211215.:(19632),,;,(430074).:(50378051);(2003033159).122(1.,430074;2.,100084):,,,,,.,,,,,,,,,.:;;;;;:TU378:A:167227037(2005)022000820517,43.8m,19,79.8m,1.(),.:80%;,.15d,15d,,30d,.5483.5mm.,,,.,.A,B5YCL2A21a(5)87mm,,.,A,B5YCL2A21a(5),.2.1.6m,3.6m.120mm,C40,300mm450mm,600mm450mm600mm900mm..415.24mm,1860MPa.QM-4..4525;8525;10525,16525.1ömm22220056()J.ofHUST.(UrbanScienceEdition)Vol.22No.2Jun.2005©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.22,,,.[15].,,,.,(3),k34,,(4),kk=12EIöl3,(1),E;l();I=ni=nPd4ö64,,n,i,d.,1öA5YCL2A21a5,.51öAYCL2A21aöm3,,,[1,2].,,,,.,,,[3].Fi[79]Fi+1Fi=Li+1Li1+KLi1+1F(i,i-1)++1F(i,i-1)F(2,1)=F(i+1,i)(i=1,2,N);(2)N+1i=1Fi=F,(3),F,,F=1D(D),,F;Lii28d;K,;N.92:©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,,,.5YCL2A21a(6).6ökNm4Npe,.,H,NpecosHNpesinH.H,cosH=1,sinH=H,NHpe=Npe,NVpe=NpeH.AM0A=NpeeA,BM0B=NpeEB.[10]q3=8Npee30öl2,(4),e30=(eA+eB)ö2+em,eAA,eBB;em.5YCL2A21a(7).7ökNm51öA5YCL2A21a1,k=292kNöm.,(2),,.,26mm76mm,102mm(3).89.1Iömm4Aömm2EIökNm-2EAökN5.171094.35105168025141375008.511095.341052765751735500052.741096.7210517140502184000022014kNm724kNm1142kNm181kNm1630kN194.66kN787kN138.41kN1075kN506kN3mm7674.52625.5+102100,25.5%,,.89ökNm6a..,1,5%6%(4).4NyökNM0ökNm$ömm201732145922190211762420620893262222051102823820112730253197143b..,,.k292kNöm584kNöm,102mm77mm,.,,,,.01()2005©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.c..10,11,,..,.10ökNm11ökNm,(12);,(13).,,.12ökNm13ökNm,,.,,.d..,,,56mm.,,,,.,,,102mm.7a.,.b.,.c.(),.d.,,,.e.,,.[1].[M].:,1997.[2].[J].,2000,33(6):1052108.[3],,,.[J].,2004,21(2):62268.[4].[D].:,2002.[5],,,.[J].,2002,32(3):10212.[6],,.[J].,2003,33(8):25227.[7]GrundyP,KabailaA.Constructionloadsonslabswithshoredformworkinmultistorybuildings[J].ACIJournal,1963,60(12):172921738.[8]FangDong2ping,GengChuan2dong,ZhuHong2yi,etal.Floorloaddistributioninreinforcedconcretebuildingsduringconstruction[J].ACI,JournalofStructure,2001,98(2):1492156.[9]DuanMing2zhu,ChenWai2fah.Improvedsimpli2fiedmethodforslabandshoreloadanalysisduringconstruction[R].Projectreport:CE2STR295224,PurdueUniversity,1995.[10],.[M].:,1998.112:©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.AccidentAnalysisofPrestressedReinforcedConcreteStructuresDuringConstructionZHAOTing2sheng1PANXian2yi2FANGDong2ping2(1.SchoolofCivilEng.&Mechanics,HUST,Wuhan430074,China;2.SchoolofCivilEng.,TsinghuaUniv.,Beijing100084,China)Abstract:Theprestressedreinforcedconcretestructureduringconstructionisatime2dependentstructuralsystem.Theloadsactingonthestructureincludeconstructionloadandprestressedequivalentloads.Becauseoflackingoftheory,theerrorsusuallyappearinthedesignandconstructionofthestructure.Forexample,onerealengineeringisaprestressedreinforcedconcretestructure,andtwosetsofprestressedsteelbararedesigned,onecomesthroughthestripofpostpouringconcreteandtheotherdon’t,moreoverabnormaldeformationisproducedinconstructionofthestructure.Thereforeacontinuumbeamwithelasticseatcomingfromtherestrictofsteelbarinastripofpostpouringconcreteisproposed,consideringtheconstructionloadsandprestressedequivalentloads,furthermorecausesofabnormaldeformationareanalyzed.Theparametersofanchorangleofprestressedsteelbarandstiffnessofelasticseat,etc.arestudied,thenthesuggestionsfordesignandconstructionofprestressedconcretestructureswithastripofpostpouringconcretearegiven.Keywords:prestressedreinforcedconcretestructures;design;construction;constructionload;prestressedequivalentloads;deflection(4)3-DAnalyticalMethodUsedtoCalculateShieldTunnelingInducedSoilDisplacementsJIANGXin2liang1ZHAOZhi2min1(1.SchoolofCivilEng.,TianjinUniv.,Tianjin300072,China)Abstract:Tunnelinginurbanareascausesthemovementofthesoilaroundthetunnel,soestimatingpotentialsoilmovementisveryimportanttocontrolitandprotectexistedconstructionfoundationandundergroundpipelines.Soildisplacementisinducedbygroundlossandisaffectedbyinjectionamount.Accordingtotheregularitiesof32Ddistributionofgroundlossandinjectionamount,usingimagemethodtheory,thenumericalintegratingin32Danalyzingforgroundlossandinjectioninduceddisplacementsduringtunnelingarestudied.ComparingwiththeobservedresultsofTianjinundergroundrailwayproject,itisidentifiedtobedependable.Keywords:imagemethod;groundloss;injectioncapacity;spatialanalysis21()2005©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.