港珠澳大桥混凝土结构耐久性设计原则与方法-王胜年

47620146CHINACIVILENGINEEＲINGJOUＲNALVol．47Jun．No．620142011BAG07B042013-05-151213431．5102302．5190153．1000844．264005120、。、、、120。TV431A1000-131X201406-0001-08DurabilitydesignprincipleandmethodforconcretestructuresinHongKong-Zhuai-MacausealinkprojectWangShengnian1SuQuanke2FanZhihong1LiQuanwang3ZhouXingang4LiKefei31．CCCCFourthHarborEngineeringInstituteCo．Ltd．Guangzhou510230China2．HZMBridgeProjectAdministrationZhuhai519015China3．TsinghuaUniversityBeijing100084China4．YantaiUniversityYantai264005ChinaAbstractTheprinciplesandprocedureforthedurabilitydesignofconcretestructuresinHongKong-Zhuhai-MacauHZMprojectforadesignworkinglifeof120yearsareintroduced．Theenvironmentalactionsarefirstlyanalyzedandclassifiedfortheprojectandthepossibledeteriorationprocessesforstructuralconcreteareidentifiedwithrespecttotheirmechanisms．Thedurabilitydesignisconductedfrombothmaterialscompositioncontrolandperformance-baseddesign．Thetargetdesignservicelifeanddurabilitylimitstatesareattributedtoconcreteelementsaccordingtotheirstructuralimportanceandmaintenanceability．Accordingtotheprescriptiverequirementsonmaterialcompositionsthecarbonation-inducedandchloride-inducedcorrosionsofreinforcementsteelareconsideredasmostcriticalprocessesthatcontrolthedesign．Thethicknessandqualityofconcretecoversaredeterminedfromchloridepenetrationmodelusingapartialfactordesignscheme．Forchlorideingressthepartialfactorsarecalibratedfromfullprobabilisticapproachforatargetreliabilityβ=1．3．Thestatisticalpropertiesofparametersareregressedfrom30-yearexposuretestdata．Finallytherelationbetweenthedesignvaluesofchloridediffusioncoefficientandthelaboratorymeasuredvaluesisanalyzedtoestablishabasisfordurabilityqualitycontrolinconstruction．KeywordsHZMbridgedurabilitydesignservicelifedura[e-mail]、、28．8km36．8km700。1202008～201020102015/2016。120。。、·2·20141。2-3。。、45-7。、8-10。11-12。120。11．1、。22．3～23．1℃77%～80%3．1m/s3．6m/s6．6m/s。Cl－10700～17020mg/LSO42－1140～2260mg/LpH6．65～8．63-32．925．4。101002．74m－1．27m3．47m－1．51m。1001%5．47mJGJ275—2000134．83m。3．52m－1．32m1003．92m。JGJ275—2000＞+6．26m+6．26～－0．40m－0．40m～－2．10m＜－2．10m。1．2GB/T50476—200875。1I、III、V。1Table1EnvironmentalclassificationforＲCelementsinHZMprojectＲC/PCICO2I-BIII-CIIIIII-DIII-F/VSO2－4Mg2+CO2V-DSO2－41000～4000mg/LMg2+1000～3000mg/LCO230～60mg/LICO2I-BIIIIII-DIII-E/III-F/VSO2－4Mg2+CO2V-DSO2－41000～4000mg/LMg2+1000～3000mg/LCO230～60mg/LIIIIII-C/VSO2－4Mg2+CO2V-DSO2－41000～4000mg/LMg2+1000～3000mg/LCO230～60mg/L1．31IIIIV-。1CO2476··3·14。。、15。216。、。15。3。1718。19。。4-AAＲDEF。20AAＲDEFC3ASO34711-12。22．1120。2711。、。。。2Table2DurabilityrequirementsforＲCelementsatbothmaterialandstructurallevelsAAＲDEF√√√√√√√√√√√√√√√√Cl-√C3A√√SO3√√√√√√√√√√√√√√√√2．2120。。120。112。ab。ab。3、。2．33。。β=1．3fibModelCodeβ=1．521。·4·20143、DLSTable3DesignlivesforPC/ＲCelementsandtheirdurabilitylimitstatesDLSDLSmm120III-Fa0．15120———120III-Da0．20120III-Fa0．15120III-Fa0．15120III-Ca0．20120III-Da0．20120III-Da0．20120III-Fa0．15120I-B/III-Da0．20ＲC/PC120III-Fa0．15ＲC120III-CFa0．15120III-Ca0．20120III-Ea0．15120I-BIII-Da0．20120III-Ea0．15120III-Fa0．15120III-C——120III-C——①②DLS。。。。、7223。33．1Fick8DLSG=Ccr－Cs1－erfxd2DCl·t槡()[]SL1Ccrs%xdmDClm2/stSLerf。DClt=D0Clt0()tn=D0Clηt0t2nD0t0D0t0ηt0tDCl。23。DCl30ηt0tt＞30years=ηt0t=30years330。tSL5CcrCsxdD0nη。3．2。。30β=1．3。1。1235168、、476··5·1Fig．1Statisticalpropertiesformodelparametersofchlorideingressbeta39530190450mm6．1mm19965．3mm1996。β=1．3。Δxxnomdxmind。195%xnomdxmindΔx10mm4。50、120。DClxd。4β=1．3tSL=50120yearsTable4Calibratedcharacteristicvaluesandpartialfactorsforchlorideingressdesignforservicelifeof50yearsand120yearsβ=1．3tSL=50120yearsCcr%binder2．00．750．750．85γc2．01．71．71．1Cs%binder4．503．825．441．98γs1．051．051．051．1DCl10－12m2/s3．03．03．03．0γD1．051．11．11．1η－0．0740．0670．0610．047γη1．051．051．051．35xdmmxnomd60808050Δxd101010103．34G1=Ccrγc－γsCs1－erfxnomd－Δxd2γDD0Cl·γηη·t槡()[]SL≥04D0Cl·6·2014xnomd。4235012028d56d。255～65mm502．9～4．3×10－12m2/s28d2．1～3．1×10－12m2/s56d312075～85mm2．5～3．3×10－12m2/s28d1．8～2．4×10－12m2/s56d。2β=1．3tSL=50yearsFig．2ConcretecoverthicknessandqualityforＲCelementsindifferentexposurezonesβ=1．3tSL=50years4233β=1．3tSL=120yearsFig．3ConcretecoverthicknessandqualityofＲCelementsindifferentexposurezonesβ=1．3tSL=120years5。DClt0t0NSSD、24-25。ＲCM26NSSMt0NSSDNSSDNSSM。476··7·5β=1．3Table5DurabilitydesignresultsforＲCelementsinHZMprojectβ=1．3tSLyearDLSxnomdmmD0Cl10－12m2/s28d56dDCl10－12m2/s28d56d120a453．02．06．04．0120a803．02．06．04．0120a453．02．06．04．0、120a503．52．27．04．5120a853．52．27．04．5120a503．52．27．04．5120a853．52．27．04．5120a653．52．27．04．5120a653．52．27．04．550a603．52．27．04．5120a803．52．27．04．5120a503．52．27．04．5ＲCMNSSM。2NSSMNSSD2。5。。5120。。。、。Fick。DLSβ=1．3。30β=1．3。、。。NSSDNSSM。1ISO138232008GeneralprinciplesonthedesignofstructuresfordurabilityS．GeneveInternationalOrganizationforStandardization20082DuraCrete．ProbabilisticperformancebaseddurabilitydesignmodelingofdegradationＲ．NetherlandsDuraCrete19983SarjaA．Durabilitydesignofconcretestructures—Committeereport130-CSLJ．MaterialsandStructures200033114-204HobbsDWMatthewsJDMarshBK．Mini