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1、多跨預應(yīng)力簡支T型梁橋?qū)W校代碼:學號:HefeiUniversity畢業(yè)設(shè)計BACHELORDISSERTATION設(shè)計題目:多跨梁橋綜合設(shè)計學位類別:學科專業(yè):土木工程作者姓名:王守亮導師姓名:韓振峰完成時間:2015年5月多跨梁橋綜合設(shè)計摘要梁橋是指結(jié)構(gòu)在垂直荷載作用下,支座只產(chǎn)生垂直反力而無水平反力的梁式體系橋的總稱,該類橋的特點是受力明確,計算簡單,理論與實際吻合好,施工也比較方便。預應(yīng)力混凝土T形橋梁結(jié)構(gòu)簡單,受力明確,具有節(jié)省材料,架設(shè)安裝方便,跨越能力較大等優(yōu)點。本設(shè)計為新建橋梁,屬跨
2、河橋,對其進行綜合設(shè)計。主要內(nèi)容包括:縱橫斷面布置,主梁設(shè)計,橫隔梁設(shè)計,還有行車道板設(shè)計??v橫斷面布置:根據(jù)規(guī)范要求和工程實踐經(jīng)驗確定主梁間距與主梁片數(shù)和主梁高度及各截面主要尺寸。主梁設(shè)計:內(nèi)力計算由恒載內(nèi)力和活載內(nèi)力計算組成。恒載內(nèi)力由結(jié)構(gòu)力學可求出,而活載內(nèi)力計算時要利用按修正偏心壓力法計算得出的荷載橫向分布系數(shù)。根據(jù)計算得出的各種內(nèi)力組合確定設(shè)計控制內(nèi)力進而對預應(yīng)力鋼束數(shù)進行估算。按后張法制作主梁,采用錐型錨具和直徑50mm的抽拔橡膠管,計算各種預應(yīng)力損失得出有效預應(yīng)力,對主梁進行強度、應(yīng)力
3、和變形驗算。行車道板設(shè)計:本設(shè)計中行車道板的受力圖示為單向板。關(guān)鍵詞:T型梁砼;預應(yīng)力;灌注樁;后張法;修正偏心壓力法1IntegrateddesignofmultispangirderBridgesABSTRACTGirderbridgeisreferstothestructureunderverticalload,bearingmakesverticalreactionandnolevelisthefloorboardofthereactionsystemofbeambridge,thebrid
4、geisthefeatureofstressisclear,simplecalculation,theoryandtheactualmatchwell,constructionisconvenient.PrestressedconcreteTbridgestructureissimple,stress,savematerial,theerectionconvenientinstallation,largespanningcapacity,etc.Themaincontentofthisdesigni
5、sasfollowings:Thearrangeoflongitudinalsectionandlateralsection,Mainbeamsdesign,CrossingbeamdesigningandDrive-wayplankdesigning.Thearrangeoflongitudinalsectionandlateralsection:Accordingtothespecificationandtheexperienceofpracticalengineering,wecandecid
6、ethedistanceofgirders,thenumberofthegirders,theheightofthemainbeamsandthemainsizeofeachsection.Mainbeamsdesign:Internalforcesincludeinvariableforceandvariableforce.Wecanusethemethodofthestructuralmechanics.Tocalculatethevariableinternalforce,wecalculat
7、ethelateraldirectioncoefficientoftheloadwiththemethodofcorrectedeccentricitypressures.withtheresultofthecalculation,wecanobtainthecontrolinternalforce,andwecanapproximatelydecidethenumberofthepre-stressedconcreteband.designthemainbeamswithpost-tensioni
8、ngmethod,selectingpre-burrycorrectedtubeanchoring.Thencalculatethelossofthepre-stressandobtainthevalidpre-stressandexaminethestrength,stress,andtransformofthemainbeams.Crossingbeamdesigning:Tomakesurethatallmainbeamsreartheloadtogethera