后张法预应力混凝土简支t型梁桥上部结构设计

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1、内容摘要本设计为后张法预应力混凝土简支T型梁桥上部结构设计。跨径布置为25m，计算跨径24.6m,主梁全长24.96m,桥面宽度为净9m（行车道）+2×0.75m（防撞栏）。设计荷载：公路—II级；环境标准：I类环境；设计安全等级：二级。施工方法采用后张法，用金属波纹管和夹片锚具，预应力钢束用曲线形，用高强度低松弛预应力钢绞线。依据桥梁规范计算荷载验算应力然后确定桥梁的截面及其配筋情况，按照全预应力构件设计。本文主要阐述了该桥的设计、计算及验算过程。首先进行了主体设计及计算。包括主梁作用效应计算；预应力钢束的估算及其布置；钢束预应力损失计算。然后进行主梁截面承载力与应

2、力计算。主要包括承载能力极限状态计算；持久状况正常使用极限状态抗裂性验算；持久状况构件应力计算；短暂状况构件的应力验算及主梁变形验算。其次进行横隔梁和行车道板的设计。最后进行了主梁端部的局部承压验算。关键词预应力；后张法；T型梁；内力计算；强度验算·87·ThedesignofthebridgesuperstructureonCountyRoadX07Author:LiQichenInstructor:XieXiaopengAbstractThecontentofthisdesignistheexcogitationforthesuperstructureofpost

3、-tensioningprestressedconcretesimply-supportedT-beambridge.Standardlengths：25m;calculatedspan:24.6m；mainlength:24.96m；width:9m(carriageway)+2*0.75m(bull).Designload:highway-II,Environmentalstandardofenvironment:I;Designsafetylevel:2.Thisdesignadoptshemethodofpost-tensioningconstructionw

4、ithmetalcorrugatedpipeandslicetheanchorage,prestressingtendonswithhighstrength,withmeasuresoflowrelaxationprestressedstrands.Accordingtothebridgestandardstocalculatetheloadandthestress.Thenascertainthesectionandreinforcement,andonthebasisofthefullprestressmethodtodesignthestructuralcomp

5、onent.Myprimarypurposeinthisarticleistoconceptualizetheprocessofthedesign、calculationandcheckingcalculation.thefirststepistodesignandcalculatethemainpart,whichincludesthemaineffect;Estimationofprestressingtendonsanditslayout,Steelbeamprestresslosscalculation.Thencomputethebearingcapacit

6、y-andstress-ofthesectionofthemaingirder,mainlyincludingthebearingcapacity·87·calculationlimitstate,Lastingconditionnormaluselimitstatecracking-resistance,checking,Lastingcondition;structuralstresscomputationBrieflystateofstresscalculationandstructuraldeformationcalculationgirder.Theseco

7、nd,designtheDrivewayplate.Finallycheckthepartialpressureoftheendsofthemaingirder.KeywordsPrestressed；post-tensioning；T-beam；Internalforcecalculation；Strengthcalculation；G-Mmethod·87·目录第一章设计基本资料及构造布置11.1设计资料11.2主要材料和工艺11.3结构设计11.4几何特性计算2第二章主梁设计52.1主梁作用效应计算52.2预应力钢束数量估算及其布置192.3计