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1、多跨预应力简支T型梁桥学校代码:学号:HefeiUniversity毕业设计BACHELORDISSERTATION设计题目:多跨梁桥综合设计学位类别:学科专业:土木工程作者姓名:王守亮导师姓名:韩振峰完成时间:2015年5月多跨梁桥综合设计摘要梁桥是指结构在垂直荷载作用下,支座只产生垂直反力而无水平反力的梁式体系桥的总称,该类桥的特点是受力明确,计算简单,理论与实际吻合好,施工也比较方便。预应力混凝土T形桥梁结构简单,受力明确,具有节省材料,架设安装方便,跨越能力较大等优点。本设计为新建桥梁,属跨
2、河桥,对其进行综合设计。主要内容包括:纵横断面布置,主梁设计,横隔梁设计,还有行车道板设计。纵横断面布置:根据规范要求和工程实践经验确定主梁间距与主梁片数和主梁高度及各截面主要尺寸。主梁设计:内力计算由恒载内力和活载内力计算组成。恒载内力由结构力学可求出,而活载内力计算时要利用按修正偏心压力法计算得出的荷载横向分布系数。根据计算得出的各种内力组合确定设计控制内力进而对预应力钢束数进行估算。按后张法制作主梁,采用锥型锚具和直径50mm的抽拔橡胶管,计算各种预应力损失得出有效预应力,对主梁进行强度、应力
3、和变形验算。行车道板设计:本设计中行车道板的受力图示为单向板。关键词:T型梁砼;预应力;灌注桩;后张法;修正偏心压力法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