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1、学号:24122600827毕业设计题目:平江危桥改造金晓桥施工图设计作者届别系别专业土木工程指导老师职称完成时间II摘要本设计是依据2004年的规范设计的一座35m预应力混凝土T形简支梁桥,汽车荷载采用公路Ⅱ级设计,没有人群荷载。该桥标准跨径35米,计算跨径33.88米,主梁全长34.96m,桥面宽为净7+2×0.5m,采用4片主梁,间距2.0m,梁高2.3m,设5道横隔梁,翼缘板采用刚结,预应力筋采用3束7丝15.2钢绞线,后张法施工,各主梁配筋及布置相同。本设计书共包括以下内容:1.纵横断面设计根据规范要求确定主梁间距与主梁片数和主梁高
2、度及各截面主要尺寸.2.主梁设计主梁设计首先进行内力计算,主要由恒载内力和活载内力计算组成.内力计算完成后,根据所算出的内力对预应力钢束数进行估算,进行配筋,然后对钢束进行预应力损失计算,最后对主梁进行强度,应力和变形验算.3.横隔梁设计设置横隔梁是为了保证各主梁共同受力和加强结构整体性,本设计中采用偏心压力法进行横隔梁计算.鉴于桥梁跨中处横隔梁受力最大,只计算跨中横隔梁内力,其余横隔梁可依据中横隔梁偏安全选用相同的截面尺寸和配筋.关键词:预应力混凝土、T型梁、后张法。II1湖南理工学院南湖学院毕业(论文)设计ABSTRACTThedesig
3、nisa35-meterprestressedconcretesimplysupportedT-beambridgebasedonthedesignofthenewrulesin2004,withthemotorvehiclesusingtheroadloadⅡlevel,andthecrowdloadisfromthestandardvalue.Thebridgespandesignedis35meters,andthecalculationlong-spanis33.88meters,themaingirderlengthis34.96m
4、eters,theprefabricatedofbridgewideisnet7+2×0.5m.Thebridgeusesfivemaingirderwithspacing2.0m,andthebeamis2.3mhigh.Thereare5crossingbeamlocatedinthebridge,thebeamflangeplateusesjustguitar,andthepretestingforcemuscleadopts3charcolplainsteelwireφ15.2,theconstructionusespost-tens
5、ioned,themainbeamreinforcementandlayoutisthesame.Atotalofthisdesignincludesthefollowingcontent:1.ThearrangeoflongitudinalsectionandlateralsectionToidentifythemainbeamandgirderspacingandthemainbeamofafewfilmsandahighdegreeofcross-sectionmaindimensionsinaccordancewithregulato
6、ryrequirements2.MainbeamsdesignFirstofall,themainbeamdesignisforthecalculationofinternalforces,primarilycalculatedcomposingbycross-containedsetofinternalforcesandinternalforce.afterInternalforcecalculationcompleted,thereinforcementisestimatedaccordingtotheinternalforcescalc
7、ulatedonthenumberofpre-stressedbeamofsteel,andthenpre-steelbeamStresslosscalculations,finallythemainbeamiscarriedoutonintensity,stressanddeformationcheck.3.CrossingbeamdesigningTomakesurethatallmainbeamsreartheloadtogetherandtoenhancetheglobalityoftheconstruction,thisdesign
8、goesonthecrossingbeamcalculationwiththemethodofcorrectedeccentricitypressures.Weon