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1、學(xué)號:2011屆本科生畢業(yè)論文(設(shè)計)題目:咸旬高速涇河大橋結(jié)構(gòu)設(shè)計學(xué)院(系):水利與建筑工程學(xué)院專業(yè)年級:土木111學(xué)生姓名:指導(dǎo)教師:合作指導(dǎo)教師:完成日期:2015.5.31中國陜西楊凌咸旬高速涇河大橋結(jié)構(gòu)設(shè)計學(xué)生:專業(yè)班級:土木111指導(dǎo)教師:摘要:預(yù)應(yīng)力混凝土連續(xù)箱梁橋結(jié)構(gòu)剛度大,動力性能好,而且主梁變形撓曲線平緩,有利于高速行車,連續(xù)梁在活載作用下時,因主梁連續(xù)會產(chǎn)生支點(diǎn)負(fù)彎矩,對跨中正彎矩也會有卸載作用,其彎矩分布較合理?,F(xiàn)階段在公路橋梁工程中應(yīng)用非常廣泛。通過得到的數(shù)據(jù),本設(shè)計首先根據(jù)橋址處原始資料以及道路等級進(jìn)行橋型方案設(shè)計,我決定采用了連續(xù)小箱梁橋、梁拱橋、變截面連續(xù)
2、梁橋等三個方案進(jìn)行橋型方案的比選,繼而本著結(jié)構(gòu)受力合力、安全舒適、經(jīng)濟(jì)美觀的原則,最終選擇連續(xù)小箱梁橋作為推薦方案。我推薦方案采用簡支轉(zhuǎn)連續(xù)的施工方法,首先預(yù)制主梁后吊裝施工成連續(xù)梁,在主梁上采用等高度變截面的箱形梁,我打算跨徑設(shè)計為30米。主橋分六等跨,引橋分四等跨,全長260米。在此次設(shè)計計算中,我首先擬定主要構(gòu)件的截面尺寸;繼而計算主梁截面的幾何特征值和控制截面的設(shè)計內(nèi)力及其在承載能力極限狀態(tài)下相應(yīng)的內(nèi)力組合值;接下來進(jìn)行配筋計算,我的方案是采用后張法預(yù)應(yīng)力鋼束施工的施工工藝,接著估算預(yù)應(yīng)力鋼束的數(shù)量并對其進(jìn)行布置。然后根據(jù)規(guī)范要求,進(jìn)而進(jìn)行預(yù)應(yīng)力損失的計算得到有效預(yù)應(yīng)力值。在最后
3、,將按照正常使用極限狀態(tài)進(jìn)行截面強(qiáng)度驗(yàn)算和應(yīng)力驗(yàn)算;經(jīng)過驗(yàn)算結(jié)果表明,該橋強(qiáng)度、應(yīng)力等均滿足規(guī)范限值要求,全橋結(jié)構(gòu)和安全可靠。關(guān)鍵詞:預(yù)應(yīng)力;連續(xù)箱梁;方案比選XIANXUNHIGHSPEEDJINGHERIVERBRIDGESTRUCTUREDESIGNStudent:MaLiangProfessionalGrade:Civil111Instructor:ZhangPengAbstract:prestressedconcretecontinuousboxgirderbridgestructurestiffness,dynamicperformancegoodanddeformation
4、ofmainbeamdeflectioncurveisgentle,isconducivetohighspeeddriving,continuousbeamunderliveload,becauseofthecontinuousgirderwillproducethefulcruminthenegativemoment,onthecrossinthepositivemomentwillalsouninstall,themomentdistributionmorereasonable.Atpresent,theapplicationofhighwaybridgeengineeringisv
5、eryextensive..Throughthedataobtained,thefirstaccordingtothebridgesiteattherawmaterialsandthegradeoftheroadbridgedesign,Idecidedtobridgeschemeselection,thenthepurposeofstructurestressforce,safetyandcomfort,aesthetic,economicprinciples,thefinalchoiceofcontinuousboxgirderbridgeisrecommendedbythecont
6、inuousboxgirderbridge,LiangGongqiao,variablecross-sectioncontinuousgirderbridgewiththethreeschemes.Irecommendschemebysimplysupportedcontinuousconstructionmethod,firstprecastgirderhoistingconstructionascontinuousbeam,onthemainbeamwithhighlyvariablecross-sectionboxbeam,Iintendtodesignspanof30meters
7、.Thesixcross,fourspanbridge,atotallengthof260meters.InthedesignandcalculationoftheIfirstproposedthesectionsizeofthemaincomponents;thencalculatethegeometriccharacteristicsofthemaingirdercross-sectionvaluesandthecontrols