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1、預(yù)應(yīng)力混凝土先簡支后連續(xù)梁橋設(shè)計(jì)摘要本次設(shè)計(jì)是有關(guān)預(yù)應(yīng)力混凝土連續(xù)箱梁橋設(shè)計(jì)，橋梁跨徑35m+50m+35m，先簡支后連續(xù)結(jié)構(gòu)梁橋在高等級公路中得到了越來越多的使用，漸漸代替了原來單一的簡支梁橋或連續(xù)梁橋，它兼顧了簡支梁橋和連續(xù)梁橋兩者的優(yōu)點(diǎn)。而體系轉(zhuǎn)化在先簡支后連續(xù)梁橋施工中具有重要意義。箱梁吊裝完成后，預(yù)制梁非連續(xù)端安裝在永久支座上，連續(xù)端安裝在臨時支座上，此時墩頂永久支座暫不受力，由臨時支座參與結(jié)構(gòu)受力，支撐箱梁，每跨之間為簡支體系，待體系轉(zhuǎn)換完成后，形成整體的連續(xù)結(jié)構(gòu)體系，再將臨時支座拆除，使原來布置在墩頂中間的永久支座參與受力。?簡支轉(zhuǎn)連續(xù)體
2、系轉(zhuǎn)換的主要施工工序是先連接橋面板鋼筋、端橫梁鋼筋及澆筑端橫梁混凝土，再逐次連接連續(xù)接頭段及設(shè)置接頭鋼束波紋管并穿束、綁扎中橫梁鋼筋、澆筑連續(xù)接頭段和與頂板鋼束同長范圍內(nèi)的濕接縫，待混凝土達(dá)到設(shè)計(jì)強(qiáng)度要求后，進(jìn)行墩頂鋼束張拉及壓漿，再由跨中向支點(diǎn)澆筑剩余部分的濕接縫，最后拆除臨時支座，使梁支承在永久支座上，經(jīng)支座轉(zhuǎn)換形成連續(xù)梁體系。?簡支轉(zhuǎn)連續(xù)梁橋體系形成的關(guān)鍵是結(jié)構(gòu)從簡支狀態(tài)轉(zhuǎn)換為連續(xù)狀態(tài)，包括混凝土現(xiàn)澆段施工、頂板負(fù)彎矩預(yù)應(yīng)力張拉和臨時支座的拆除。其中連續(xù)端澆筑及張拉壓漿順序采用對稱澆筑、對稱張拉。本次畢業(yè)設(shè)計(jì)主梁采用等高度箱型截面，橫向布置4片箱
3、梁。設(shè)計(jì)車速100Km/h，3車道，橋梁總寬:0.5+3×3.8+0.5=12.4m。橋軸線為直線，道路縱坡3%，橫向坡度1.5%。設(shè)計(jì)荷載標(biāo)準(zhǔn)為公路Ⅰ級。由于計(jì)算過程中有較多的數(shù)據(jù)處理，如采用手算較為繁瑣，且準(zhǔn)確性得不到保證，因此采用計(jì)算機(jī)輔助設(shè)計(jì)。本次設(shè)計(jì)采用了AUTOCAD、橋梁博士、EXCEL電子表格等軟件，通過本次畢業(yè)設(shè)計(jì)，大幅提升了自己對辦公軟件及橋梁設(shè)計(jì)軟件使用能力。關(guān)鍵詞：預(yù)應(yīng)力混凝土連續(xù)梁橋先簡支后連續(xù)橋梁博士ThedesignofprestressedconcretecontinuousboxgirderbridgedesignAb
4、stractThedesignofprestressedconcretecontinuousboxgirderbridgedesign,bridgespan35m+50m+35m,simplesupportedcontinuousgirderbridgestructureinhighgradehighwayobtainedthemoreandmoreuse,andgraduallyreplacedtheoriginalsinglebeambridgeandcontinuousbeambridge,whichtakeintoaccounttheadvan
5、tagesofsimplysupportedbeambridgeandacontinuousbeambridge.Andthesystemtransformationofthefirstsimplysupportedcontinuousbeambridgeconstructionhasimportantsignificance.Boxgirderhoistingfinished,theprecastbeamnoncontinuousterminalinstalledonthepermanentsupport,continuousterminalinst
6、allationinthetemporarysupport,atthepiertoppermanentsupporttemporarilynotbyforce,bythetemporarysupportinthestructurestress,supportingtheboxbeam,eachcrossbetweensimplysupportedsystem,untilafterthecompletionofthesystemtransformation,theformationoftheoverallcontinuousstructuresystem
7、,thenthedemolitionoftemporarysupport,sothattheoriginallayoutinthepiertopinthemiddleofthepermanentsupportparticipationbyforce.Simplysupportedcontinuoussystemswitchofmainconstructionprocedureistoconnectthebridgedeckreinforcement,endbeamreinforcedandpouringtheendcrossbeamconcrete,a
8、ndthensuccessivelyconnectedcontinuousjointandjo
