长安大学结构设计原理课程设计

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1、长安大学结构设计原理课程设计1.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:lowrelaxationstrands(1×7)；Stan

2、dardvalueoftensionstrength；Designvalueoftensionstrength；Nominalarea=140mm2,nominaldiameter15.2mm;Elasticmodulus；Strandtaperedofgroupanchors.Nonprestressedreinforcement:HRB400,fsk=400MPa,fsd=330MPa.HRB335：(d<12mm)normalvalueoftensionstrength；designvalueoftensionstrength；Elasticmodulus=2.0×

3、105MPa;Concrete：C50；Ec=3.45×104MPa；normalvalueofcompressstrength＝32.4MPa；designvalueofcompressstrength＝22.4MPa；normalvalueoftensionstrength＝2.65MPa；designvalueoftensionstrength＝1.83MPa.57(5)Designrequirements：JTGD62-2004,TotalPre-stressConcrete.(6)Constructionmethod：Post-tension;Pre-castg

4、irder;TDJack;Cast-in-sitewetconnectionjointwithwidthof400mm;Asphaltlayerwith80mmthickness.2.Size57573.Geometricfeaturesofallcross-section1)Calculationofeffectivewidthbf´Accordingtothehighwaybridgegauge,obtainingminimumvalueofthefollowingthreevalues:(1):Simplesupportedbeamspan’sl/3,l/3=266

5、60/3=8887mm;(2):Averagedistanceofthetwoadjacentbeams,tothemiddlebeamis2200mm;(3):(b+6bh+12hf´),bh=0,wecanlethf́isequivalentwithaverageofwebthicknessaboutmiddlespansection.So,wehave(b+6bh+12hf´)=200+6×0+12×228=2936mm;bf´=2200mm;572)Calculatinggeometricfeaturesofallcross-section:Generally,g

6、eometricfeaturesofmainbeamoftenuseblocknumericalsummationmethod,Areaofallcrosssection:A=AiDistancebetweengravitycenterlineoftheallcrosssectionandthetopofbeam:yu=Ai---------theareaofseparatedsectionsyi---------thedistancebetweenthecenterofgravityofseparatedsectionsandedgeofbeam57Geometryfe

7、aturesofall-sectionforI-IsectionnumberofblockareaofblockAi(mm2)yi(mm)si=Ai*yi(mm3)yu-yi(mm)Ix=Ai*(yu-yi)2(mm)Ii(mm4)Figureoflocksection13600009032400000454740659953099720000002960002202112000032410051863589770000003320000800256000000-25621039654886682670000004200001