预应力混凝土简支梁桥计算书

《预应力混凝土简支梁桥计算书》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、摘要预应力混凝土简支T形梁桥由于其具有外形简单，制造方便，结构受力合理，主梁高跨比小，横向借助横隔梁联结，结构整体性好，桥梁下部结构尺寸小和桥型美观等优点，目前在公路桥梁工程中应用非常广泛。在本次毕业设计方法选用时，主梁就选用了后张法预应力混凝土简支T形梁。在本次设计中，首先进行了桥型方案的比选，确定简支梁桥方案后，就其进行了结构设计，设计的主要内容有：拟定截面尺寸；计算控制截面的设计内力及其相应的组合值；估算预应力钢筋的数量并对其进行布置；计算主梁截面的几何特征值；计算预应力损失值；正截面和斜截面的承载力复核；正常使用极限状态下构件抗裂性及变形验算；持久状态下和短暂状态下构件截面应力验算

2、。接着进行了简单的施工方法设计，包括施工前的准备，主要分项工程的施工方法设计，冬季和雨季的施工安排以及施工过程中的环境保护措施等。关键词：预应力，T形梁，方案比选，结构设计，施工方法137ABSTRACTPrestressedconcreteT-shapedgirderbridgesareofmanyadvantages.Theyhavesimpleoutlinesandcanbefabricatedeasily.Theforcesthatactontheirstructuresarereasonable.Theratioofheightofgirderstospanofgirdersis

3、small.Inlandscapeorientationthegirdersareconnectedbyintersectinggirders.Thereforethewholestructureisofgoodentirety.Andtherearestillmanyothermerits,suchassmallsizeofinfrastructure,thebeautyofthistypeofbridgeandsoon.BecauseoftheseadvantagesthePCT-shapedgirderbridgesarenowwidelyappliedinhighwaybridge

4、projects.Intheprocessofthedesignmethodofthepaper.PosttensioningprestressedconcreteT-shapedgirderischosenasthemaingirderofthebridge.Intheprocessofthedesignofthebridge,thecomparisonofdifferenttypesofbridgeisdonefirstly.Afterthecomfirmationofthetypeofthebridge,thedesignofthestructureisdone,includingc

5、onfirmingthesizeofcrosssections,calculatingthedesignforcesofrestrainingsectionsandcombiningthemaccordingtoTheCriterion,estimatingtheamountofprestressedsteelsandarrangingthem,calculatingthegeometricaltraitsofcrosssectionsofgirders,calculatingthelossofprestress,checkingthecarryingcapacityofcrosssect

6、ions,checkcomputationsoftheanticrackcapacityofthestructureanddeformationintheultimatestateofnormaluse,andthestressofcrosssectionrespectivelyinthestateoflastingloadandinthestateoftemporaryload.Afterallthework,nextisthedesignofconstructionmethod.Itincludesthepreparationbeforeconstruction,thedesignof

7、constructionmethodofsmallprojects,thearrangementsofconstructionintherainyseasonandinwinter,themeasurementsofprotectingenvironmentintheprocessofconstruction.KEYWORDS:prestress，T-shapedgirder;comparionofdifferentsc