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《城際鐵路預(yù)應(yīng)力混凝土連續(xù)箱梁設(shè)計(jì)-(48+80+48m)--畢業(yè)論文》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
1、本科畢業(yè)設(shè)計(jì)（論文）GRADUATIONDESIGN(THESIS)論文題目：城際鐵路預(yù)應(yīng)力混凝土連續(xù)箱梁設(shè)計(jì)(48+80+48m)本科生姓名：xxx學(xué)號(hào)：xxx指導(dǎo)教師姓名：xxx職稱：教授申請學(xué)位類別：工學(xué)學(xué)士專業(yè)：土木工程(橋梁)設(shè)計(jì)(論文)提交日期：xxx.6.15答辯日期：xxx.6.17xxx大學(xué)本科畢業(yè)設(shè)計(jì)（論文）摘要本次設(shè)計(jì)為城際鐵路預(yù)應(yīng)力混凝土連續(xù)箱梁設(shè)計(jì)，跨徑組成為48+80+48m。線路情況為雙線，線間距為4.2～4.6m。主梁截面采用單箱單室直腹板形式，梁底曲線按二次拋物線變化，中支點(diǎn)梁高為6.4m，中跨跨中
2、梁高為3.6m。該橋采用懸臂澆筑施工方法，內(nèi)力計(jì)算借助有限元軟件Midas/Civil計(jì)算。擬定主梁細(xì)部尺寸后，利用Midas/Civil軟件，模擬實(shí)際施工過程，計(jì)算結(jié)構(gòu)自重內(nèi)力、二期恒載內(nèi)力、ZC活載內(nèi)力及支座沉降次內(nèi)力，并進(jìn)行內(nèi)力組合。根據(jù)梁體上下緣應(yīng)力條件估算預(yù)應(yīng)力鋼束并進(jìn)行布置。中支點(diǎn)截面在頂板及腹板內(nèi)共布置72束，每束均采用12-φS15.2鋼絞線；中跨跨中截面在底板內(nèi)布置34束，均采用15-φS15.2鋼絞線；邊跨底板內(nèi)布置18束，頂板內(nèi)布置合龍束4束，均采用15-φS15.2鋼絞線?？紤]鋼束和混凝土收縮徐變影響，重新模
3、擬施工階段，進(jìn)行內(nèi)力計(jì)算及內(nèi)力組合，以便計(jì)入預(yù)應(yīng)力效應(yīng)和收縮徐變效應(yīng)。最后，基于新的內(nèi)力組合，進(jìn)行正截面與斜截面抗裂性驗(yàn)算、正截面抗彎強(qiáng)度驗(yàn)算、斜截面抗剪強(qiáng)度驗(yàn)算、混凝土正應(yīng)力與剪應(yīng)力驗(yàn)算、預(yù)應(yīng)力鋼筋應(yīng)力驗(yàn)算及撓度驗(yàn)算，各項(xiàng)驗(yàn)算結(jié)果均符合鐵路規(guī)范要求。關(guān)鍵詞：預(yù)應(yīng)力混凝土；連續(xù)箱梁；懸臂澆筑；內(nèi)力組合；截面驗(yàn)算-V-xxx大學(xué)本科畢業(yè)設(shè)計(jì)（論文）-V-xxx大學(xué)本科畢業(yè)設(shè)計(jì)（論文）AbstractThisgraduationprojectrequiresdesigningaprestressedconcretecontinuousb
4、oxgirderwithspanof48+80+48monaninter-cityrailwayline.Thelinespacingofdouble-linerailwaythroughthisbridgevariesfrom4.2mto4.6m.Single-cellboxwithverticalwebsisusedascrosssectionofthegirder.Thevariable-depthgirderinaformofquadraticparabolais6.4mdeepatthemainpiersand3.6mde
5、epatthemid-spanofthecentralspan.Thisbridgeisconstructedwithacase-in-placecantilevermethodandinternalforcesofthegirderarecalculatedwiththefiniteelementsoftwareMidas/Civil.Afterdetaildimensionsofthegirderaregiven,theactualconstructionprocessissimulatedwiththefiniteelemen
6、tsoftwareMidas/Civiltocalculateinternalforceofweightofthestructure,internalforceofseconddeadload,internalforceofliveloadofinter-citytrainandsecondaryinternalforceofbearingsettlement.Andcombinationofinternalforcesfollows.Accordingtostressconditionatupperandloweredgesofc
7、rosssectionofgirder,thenumberofprestressingtendonsisestimatedandprestressingtendonsarelaidoutinthegirder.Thereare72prestressingtendonscomposedof12-φS15.2steelstrandplacedinthetopandbottomslabatthemainpiers;thereare34prestressingtendonscomposedof15-φS15.2steelstrandplac
8、edinthebottomslabatthemid-spanofthecentralspan;andthereare18prestressingtendonsand4closureprestressingtendonscomposed
