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1、摘要设计为总长为188m的公路直线预应力混凝土连续刚构桥,跨径组成为50m+88m+50m，截面形式为单箱单室箱型，墩身为双薄壁柔性墩。设计荷载标准为公路Ⅱ级汽车荷载。主梁采用挂篮悬臂对称施工。因时间所限，未涉及下部结构（桥墩和基础）、横向预应力及竖向预应力的设计。根据活载位置的不同，连续刚构桥的断面可能出现正弯矩或负弯矩，因而，要按弯矩变化的幅值布置预应力钢筋。连续刚构桥将连续梁与薄壁墩（柔性）固结而成，既保持了连续梁桥的优点，同时又节省了支座，减少墩与基础的工程量，并改善了结构的水平荷载作用下的受力性能，即各柔性墩按刚度比
2、分配水平力。参考了大量的工程实例，对结构方面进行了较为详细的分析和研究。横截面采用单箱单室截面，梁高按二次抛物线变化，从支座处最大5.5米到跨中2.2米，顶板厚度保持不变为25cm，同时地板厚度由80cm变至25cm。运用桥梁博士3.00对结构进行了内力分析,然后对钢筋数量进行估计并配置钢筋，检算主要控制截面的承载能力。绘制结构施工图，包括桥跨布置图、施工程序图等，进行外文翻译，最后编制设计计算说明书及文档整理。关键词：预应力混凝土连续刚构桥；悬臂施工；内力分析；截面验算；强度验算。ABSTRACTDesignforatota
3、llengthof188mhighwaylineprestressedconcretecontinuousrigidframebridge,spaniscomposedof50m+88m+50m,crosssectionformofsinglecellboxbox,thedoublethin-wallpier.Designloadstandardforhighwayvehicleloadgradeii.Thehangingbasketcantilevergirderusingsymmetryconstruction.Dueto
4、timeconstraints,notinvolvingthelowerstructure(pierandfoundation),andtheverticalprestressedTransversePrestressdesign.Accordingtotheliveloadindifferentposition,continuousrigidframebridgesectionmaybejustthemomentornegativemoment,therefore,accordingtothebendingmomentcha
5、ngeamplitudelayoutofprestressed.Continuousrigidframebridgewithcontinuousbeamandthethin-wallpier(flexible)consolidatedinto,notonlytomaintainthecontinuousbeambridgetheadvantages,butalsosavesthebearing,reducethepierandfoundationengineeringquantity,andimprovesthestructu
6、ralloadbearingperformance,namelytheflexiblepierstiffnessratiodistributionofhorizontalforceat.Thereferenceofalargenumberofengineeringpractice,thestructurewasanalyzedindetailandresearch.Crosssectionofthesinglecellboxgirdersection,highbytwoparabolachange,fromthesupport
7、ofmaximum5.5metersto2.2metersacross,roofthicknessremainedconstantfor25cm,atthesametimethefloorthicknessfrom80cmto25cm.Usingbridgedoctor3onthestructureoftheinternalforces,thentheamountofreinforcementwereestimatedandreinforcement,checkthemaincontrolsection'sbearingcap
8、acity.Drawingconstructionplans,includingthebridgespanlayout,constructionprogramplans,foreignlanguagetranslation,finallydesigncalculationsp
