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郑州大学毕业设计题目：40m预应力混凝土简支T型梁桥设计（净-7+2×0.75m人行道）指导教师：李清富职称：教授学生姓名：张朋杰学号：20070510235专业：水利水电工程（道路与桥梁方向）院（系）：水利与环境学院完成时间：2011年6月2011年6月1日郑州大学毕业设计I摘要本设计从最基本的设计方法入手，重点进行了主梁的设计，掌握了主梁的设计方法，其它部分的设计就可以仿照主梁设计进行。本设计的主要内容包括：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、应力和变形验算。横隔梁设计：设置横隔梁是为了保证各主梁共同受力和加强结构整体性，本设计中采用偏心压力法进行横隔梁计算。鉴于桥梁跨中处横隔梁受力最大，只计算跨中横隔梁内力，其余横隔梁可依据中横隔梁偏安全地选用相同的截面尺寸和配筋。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形梁；预应力；混凝土桥郑州大学毕业设计IIABSTRACTThisdesignbeginswithbasicmethodandgivesmostcontenttothedesignofmainbeams.Whenthemethodofmainbeamsdesigningismastered,wecangoonthedesigningofotherparts.Themaincontentofthisdesignisasfollowings:Thearrangeoflongitudinalsectionandlateralsection,Mainbeamsdesign,CrossingbeamdesigningandDrive-wayplankdesigning.Thearrangeoflongitudinalsectionandlateralsection:Accordingtothespecificationandtheexperienceofpracticalengineering,wecandecidethedistanceofgirders,thenumberofthegirders,theheightofthemainbeamsandthemainsizeofeachsection.Mainbeamsdesign:Internalforcesincludeinvariableforceandvariableforce.Wecanusethemethodofthestructuralmechanics.Tocalculatethevariableinternalforce,wecalculatethelateraldirectioncoefficientoftheloadwiththemethodofcorrectedeccentricitypressures.withtheresultofthecalculation,wecanobtainthecontrolinternalforce,andwecanapproximatelydecidethenumberofthepre-stressedconcreteband.designthemainbeamswithpost-tensioningmethod,selectingpre-burrycorrectedtubeanchoring.Thencalculatethelossofthepre-stressandobtainthevalidpre-stressandexaminethestrength,stress,andtransformofthemainbeams.Crossingbeamdesigning:Tomakesurethatallmainbeamsreartheloadtogetherandtoenhancetheglobalityoftheconstruction,thisdesigngoesonthecrossingbeamcalculationwiththemethodofcorrectedeccentricitypressures.Weonlycalculatetheinternalforceofthemiddlecrossingbeambecauseofthemaximumforceisintheplaceofthemiddleofthespan.Drive-wayplankdesigning:Inthisdesign,theforcediagramofthedrive-wayplankissingledirectionplank.Keywords:T-beam；pre-stress；concretebridge.郑州大学毕业设计III目录摘要.............................................................................................................................IABSTRACT................................................................................................................II第1章纵横截面布置..............................................................................................11.1设计目的............................................................................................................11.2基本资料............................................................................................................11.3主梁间距与主梁片数........................................................................................21.4主梁跨中界面尺寸拟定....................................................................................41.5横截面沿跨长的变化........................................................................................51.6横隔梁的设置....................................................................................................5第2章主梁计算......................................................................................................62.1恒载内力计算....................................................................................................62.1.1恒载集度.....................................................................................................62.1.2恒载内力.....................................................................................................72.2活载内力计算（修正刚性横梁法）................................................................72.2.1冲击系数和车道折减系数.........................................................................72.2.2计算主梁的荷载横向分部系数.................................................................82.2.3车道荷载的取值.......................................................................................122.3主梁内力组合..................................................................................................152.4预应力钢束的估算及其布置..........................................................................152.4.1跨中截面钢束的估算和确定...................................................................152.4.2预应力钢束布置.......................................................................................172.5计算主梁截面几何特性..................................................................................222.5.1净截面几何特性计算...............................................................................222.5.2换算截面几何特性计算...........................................................................222.5.3有效分布宽度内截面几何特性计算.......................................................232.5.4各阶段截面对形心轴的静矩计算...........................................................242.6钢束预应力损失计算......................................................................................272.6.1预应力钢束与管道壁之间的摩擦损失...................................................272.6.2由锚具变形，钢束回缩引起的损失...........