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1、ProjectofPrinciplesofStructuralDesign预应力钢筋混凝土T型梁结构设计1.Known:SpanofSSB:29m；ComputedspanL=27.66m；Designload：VehicularLoad-Ι；PedestrianLoad=3.0kN/m2；CoefficientofImportanceγ0=1.0；Environment：Bridgelocatesinacommonfield,environmentІ;Relativehumidity(averageofperyear)=75
2、％；Materials：Tendon:lowrelaxationstrands(1×7)；Standardvalueoftensionstrength；designvalueoftensionstrength；Road,Bridge&civilEngineering,Bilingualprogramclass1Page53ProjectofPrinciplesofStructuralDesignnominalarea=140mm2,nominaldiameter15.2mm;elasticmodulus；Strandtaper
3、edofgroupanchors.Nonprestressedreinforcement:HRB400,fsk=400MPa,fsd=330MPa.HRB335：(d<12mm)normalvalueoftensionstrength；designvalueoftensionstrength；Elasticmodulus=2.0×105MPa；Concrete：C50；=3.45×104MPa；normalvalueofcompressstrength＝32.4MPa；designvalueofcompressstrength
4、＝22.4MPa；normalvalueoftensionstrength＝2.65MPa；designvalueoftensionstrength＝1.83MPa.Designrequirements：JTGD62-2004,TotalPrestressConcrete.Construction：Post-tension;Pre-castgirder;TDJack;Cast-in-sitewetconnectionjointwithwidthof400mm;Asphaltlayerwith80mmthickness.Road
5、,Bridge&civilEngineering,Bilingualprogramclass1Page53ProjectofPrinciplesofStructuralDesign2.Sizeunit:mm3：Geometricfeaturesofallcross-section1):Calculationofeffectivewidthbf´,obtainingminimumvalueofthefollowingthreeones:(1):Simplesupportedbeamspan’sl/3,l/3=27660/3=92
6、20mm;Road,Bridge&civilEngineering,Bilingualprogramclass1Page53ProjectofPrinciplesofStructuralDesign(1):Averagedistanceofthetwoadjacentbeams,tothemiddlebeamis2200mm;(2):(b+6bh+12hf´),bh=0,wecanlethf́isequivalentwithaverageofwebthicknessaboutmiddlespansection.So,wehav
7、eso(b+6bh+12hf´)=200+6×0+12×228=2936mm;Sobf´=2200mm;2):Calculatinggeometricfeaturesofallcross-section:Generally,geometricfeaturesofmainbeamoftenuseblocknumericalsummationmethod,Areaofallcrosssection:A=AiDistancebetweengravitycenterlineoftheallcrosssectionandthetopof
8、beam:yu=Aiisareaofblock,isdistancebetweengravitycenterlineoftheallcrosssectionandthetopofbeamTheallcross-sectiongeometricfeaturesofmiddles
