资源描述:
《预应力混凝土连续梁桥上部结构的设计道桥毕业设计》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、摘要本设计主要是关于预应力混凝土连续梁桥上部结构的设计。预应力混凝土连续梁桥以结构受力性好、变形小、伸缩缝少、行车平顺舒适、养护工程量小、抗震能力强等而成为最富有竞争力的主要桥型之一。设计桥梁跨度为30m+30m+30m+30m+30m,分为两幅设计,单幅为单箱单室,桥面总宽26m,双向4车道。主要采用现浇混凝土施工,按桥梁纵坡由低到高进行浇筑,一旦浇筑必须按每联连续浇筑,不得停歇。本桥设计分为双幅14联,按联施工。设计过程如下:首先,确定主梁主要构造及细部尺寸,它必须与桥梁的规定和施工保持一致,考虑到抗弯刚度和抗扭刚度影响,设计采
2、用箱型粱。主梁的高度呈成二次抛物线变化,因为二次抛物线近似于连续梁桥弯矩变化的曲线。其次,利用桥梁博士电子软件分析结构的总内力(包括恒载和活载的内力计算),用于计算内力组合结果也由桥梁博士电子软件计算而得,从而估算出纵向预应力筋的数目,然后再布置预应力钢丝束。再次,计算预应力损失及次内力,次内力包括先期恒载徐变次内力、先期预应力徐变次内力、后期合拢预应力索产生的弹性次内力、局部温度变化次内力。然后进一步进行截面强度验算,其中包括承载力极限状态和正常使用极限状态。在正常使用极限状态验算中包括计算截面的混凝土法向应力验算、预应力钢筋中的
3、拉应力验算、截面的主应力计算。最后,通过手算计算出桥面板及桥墩的形式及受力情况,最终整理成本桥设计的总体信息。关键词:预应力混凝土连续梁;后张法;现浇砼施工50AbstractThegraduatedesignismainlyaboutthedesignofsuperstructureoflong-spanpre-stressedconcretecontinuousboxGirderBridge.Pre-stressedconcretecontinuousGirderBirdgebecomeoneofmainbridgetypeso
4、fthemostfullofcompletionabilitybecauseofsubjectingtothedintfunctionwiththestructuregood,havingthesmalldefomation,fewofcontroljoint,goingsmoothlycomfort,protectedtheamoutofengineeringsmallandhavingthepowerfullyabilityofcarthquakeproofandsoon.Fortimeandabilitylimited,the
5、designofthesubstructure,transversepre-stressingandverticalpre-stressingisnotconsidered.Thespansofthebridgeare30m+30m+30m+30m+30mm,mainbeamisrespectivedesigned,eachsuithasoneboxoneroomandfourtrafficwaysofall,thewidthofthebridgesurfaceis26m.Themajorgirderappliescantileve
6、rhung-basketbearing,symmetricequilibriumconstruction.Thebridgedesignisdividedinto126unitsand48constructionsectionThedesignprocessisasfollows:First,makesurethemaingirderstructureofdetailsandsize,itmustbewiththerulesandregulationsofthebridgeconstructionkeepsconsistent,co
7、nsideringthebendingstiffnessandwrestresistanteffectstiffness,designUSESaboxbeams.Theheightofthemaingirderisintotwoparabolicchange,becausetwoparabolicapproximatecontinuousgirderbridgebendingmomentthecurveofthechange.Secondly,theuseofbridgestructureanalysisofelectronicso
8、ftwaredrtotalinternalforce(includingthedeadloadandliveloadofinternalforcecalculation),usedtocalculatethecombinationof