某桥梁毕业设计.doc

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摘要东方红大桥位于江苏省丹阳市珥陵镇，跨越丹金溧漕河，是江苏省交通厅“苏南骨干航道网整治工程”的组成部分，配合珥陵镇市镇道路改建工程进行建设。道路等级为城市主干路Ⅱ级；通航要求为Ⅴ级航道。本桥址的桥型方案设计主要考虑通航的要求。根据专业知识和查阅参考资料，拟定了三个桥型方案：第一方案预应力混凝土连续梁桥；第二方案预应力混凝土连续刚构桥；第三方案中承式拱桥。通过方案比选，选择预应力混凝土连续梁桥作为推荐设计方案并对此方案进行了详细的设计。预应力混凝土连续梁桥包括上部结构、下部结构和附属结构。主梁采用箱形截面，梁高2.5m，翼缘宽19m，底板宽12m，腹板厚0.35m，主跨跨径50m，混凝土采用C50，预应力钢束采用后张法张拉。上部结构计算时，首先根据道路等级和车辆荷载，计算出主梁行车道板的内力，根据结果设计出行车道板所需的钢筋数量。在计算主梁恒载和活载内力时，先将主梁划分单元，在此基础上用有限元程序计算出上部结构在恒载作用下的内力、位移和不同截面的内力影响线，然后在内力影响线上加载计算出活载内力并进行内力组合，绘出全桥不同横截面的内力图。根据以上计算结果，进行全桥的预应力钢束的布置。然后计算预应力损失及预应力引起的次内力，再进行第二次内力组合，最后进行全桥不同截面的强度验算。进行下部结构计算时：先根据计算出的上部结构内力的大小选择支座的类型；再根据桥位处的地质情况桥台采用框架式桥台中的肋式桥台；桥墩采用双柱式桥墩；基础采用钻孔灌注桩并确定出具体尺寸。最后进行了下部结构的稳定性验算以及地基承载力验算。在这短短三个多月的毕业设计时间里，我的收获是很多的。首先把大学四年里所学的知识系统的串联了起来，运用所学的知识解决了现实生活中的实际问题；其次学会了按照规范要求去设计；还有自己的计算机操作水平也有了很大的提高。关键词:连续梁、内力、截面、预应力、影响线、桩基础ABSTRACT. ThelargebridgeofEastRedlocatestheLingertownofDanyangcityinJiangsuProvince,surmountstheDangoldcanal.ItistheJiangsuProvincetransportdepartmentof"thesouthernofJiangsubackboneroutenetrenovatestheproject"theconstituent,thecoordinatemausoleumtownpathrebuildstheprojecttocarryontheconstruction.TherankofpathisthecityhostIIlevel;therequestofopentonavigationisVlevelofroutes.Thedesignofbridgesitemajorconsiderationnavigableclearancerequirements.Thenaccordingtothespecializedknowledgeandtheconsultreference,ithasformulatedthreeplans:Theprestressedconcretecontinuousbridge;thepre-stressedconsecutionbridgeandthecenterreceivetypearchedbridge.Throughtheplancomparison,choosingtheprestressedconcretecontinuousbridgeastherecommendationdesignproposalandhavecarriedonthefurtherdesignregarding.Theprestressedcontinuousbeambridgeincludesthesuperstructure、thesubstructure、thebearingandtheaccessory.Themainbeamisboxbeamand2.5metersinheight,19metersintopewidthand12metersinbottlewidth.Thewebis0.35metersinwidthanddetailedscalescangetfromthepaper.Themainbeamcomputedspanis50meters.TheconcretemarkisC50.TheConstructionmethodofhightensilewirestrandedsteelispost-tensioningmethods.Whensuperstructurecomputation,firstofall,accordingtothecategoryofroadsandthevehiclesLoa,thekingpostupperlimbboardtheendogenforcehasbeencalculated,thedesigngoesonajourneythesteelbarquantitywhichthetrafficlaneboardneeds.Whencomputationkingpostpermanentloadandvariableloadendogenforce,firstofallIunitthekingpostdivision,thencalculatesinthisfoundationwiththefiniteelementprocedurethesuperstructureunderthedeadloadfunctionendogenforce,thedisplacementandtheendogenforceinfluenceline.Increaseinendogenforceinfluenceon-linecalculatestheliveloadendogenforceandcarriesontheendogenforcecombination,drawstheentirebridgedifferentlateralsectioningtotryhard.Accordingtotheabovecomputedresult,theprestressedreinforcementoftheentirebridgehasbeenarrangement.Thecomputationlossofprestressedandthepre-stressedcausetheinferiorendogenicforce,thesecondendogenforcehasbeencombinationagain,finalsectionitintensity.Choosingthesupportaccordingtothesuperstructureendogenforcesizethetype,. againusestheribtypeaccordingtothebridgesitegeologysituation;Usingtwopillartypeofthebridgepier.Thefoundationusesthedrillholetopourintothepileandthedefinitedetailsize.Finally,havingcarriedonthesubstructurestabilityaswellasthegroundsupportingcapacity.Inthisshortmorethanthreemonth’sgraduationprojecttime,Ilearnalotofknowledge.FirstIutilizetheknowledgesystemwhichIstudiedatuniversityinfouryears,thenIusedtheknowledgetosolvetheactualprobleminreallife;NextIlearnedtodesignintheprojectaccordingtothestandardrequestonthenorms;andIhavemadeagreatprogressincomputeroperationlevel.Keywords:continuousbeam,internalforces,cross-section,prestressed,theinfluenceline,thepilefoundation窗体底端.