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1、摘要預應力混凝土簡支T形梁橋由于其具有外形簡單，制造方便，結(jié)構(gòu)受力合理，主梁高跨比小，橫向借助橫隔梁聯(lián)結(jié)，結(jié)構(gòu)整體性好，橋梁下部結(jié)構(gòu)尺寸小和橋型美觀等優(yōu)點，目前在公路橋梁工程中應用非常廣泛。在本次畢業(yè)設計方法選用時，主梁就選用了后張法預應力混凝土簡支T形梁。在本次設計中，首先進行了橋型方案的比選，確定簡支梁橋方案后，就其進行了結(jié)構(gòu)設計，設計的主要內(nèi)容有：擬定截面尺寸；計算控制截面的設計內(nèi)力及其相應的組合值；估算預應力鋼筋的數(shù)量并對其進行布置；計算主梁截面的幾何特征值；計算預應力損失值；正截面和斜截面的承載力復核；正常使用極限狀態(tài)下構(gòu)件抗裂性及變形驗算；持久狀態(tài)下和短暫狀態(tài)下構(gòu)件截面應力驗算
2、。接著進行了簡單的施工方法設計，包括施工前的準備，主要分項工程的施工方法設計，冬季和雨季的施工安排以及施工過程中的環(huán)境保護措施等。關(guān)鍵詞：預應力，T形梁，方案比選，結(jié)構(gòu)設計，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
