长安大学结构设计原理课程设计(双语)

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1、DesignofthePRCSSBMay.20151.Known:（1）SpanofSSB:28m；ComputedspanL=26.66m；（2）Designload：VehicularLoad-Ι；PedestrianLoad=3.0kN/m2；CoefficientofImportanceγ0=1.0；（3）Environment：Bridgelocatesinacommonfield,environmentІ;Relativehumidity(averageofperyear)=75％；（4）Materials：Tendon

2、:lowrelaxationstrands(1×7)；Standardvalueoftensionstrength；Designvalueoftensionstrength；Nominalarea=140mm2,nominaldiameter15.2mm;Elasticmodulus；Strandtaperedofgroupanchors.Nonprestressedreinforcement:HRB400,fsk=400MPa,fsd=330MPa.HRB335：(d<12mm)normalvalueoftensionstreng

3、th；designvalueoftensionstrength；Elasticmodulus=2.0×105MPa;Concrete：C50；Ec=3.45×104MPa；normalvalueofcompressstrength＝32.4MPa；designvalueofcompressstrength＝22.4MPa；normalvalueoftensionstrength＝2.65MPa；designvalueoftensionstrength＝1.83MPa.(5)Designrequirements：JTGD62-2004

4、,TotalPre-stressConcrete.(6)Constructionmethod：Post-tension;Pre-castgirder;TDJack;Cast-in-sitewetconnectionjointwith56widthof400mm;Asphaltlayerwith80mmthickness.2.Size563.Geometricfeaturesofallcross-section1)Calculationofeffectivewidthbf´Accordingtothehighwaybridgegaug

5、e,obtainingminimumvalueofthefollowingthreevalues:(1):Simplesupportedbeamspan’sl/3,l/3=26660/3=8887mm;(2):Averagedistanceofthetwoadjacentbeams,tothemiddlebeamis2200mm;(3):(b+6bh+12hf´),bh=0,wecanlethf́isequivalentwithaverageofwebthicknessaboutmiddlespansection.So,wehave

6、(b+6bh+12hf´)=200+6×0+12×228=2936mm;bf´=2200mm;562)Calculatinggeometricfeaturesofallcross-section:Generally,geometricfeaturesofmainbeamoftenuseblocknumericalsummationmethod,Areaofallcrosssection:A=AiDistancebetweengravitycenterlineoftheallcrosssectionandthetopofbeam:yu

7、=Ai---------theareaofseparatedsectionsyi---------thedistancebetweenthecenterofgravityofseparatedsectionsandedgeofbeam56Geometryfeaturesofall-sectionforI-IsectionnumberofblockareaofblockAi(mm2)yi(mm)si=Ai*yi(mm3)yu-yi(mm)Ix=Ai*(yu-yi)2(mm)Ii(mm4)Figureoflocksection13600

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