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-1-摘要本设计是根据设计任务书的要求和《公路桥规》的规定,对高坎——上官伯段的高坎大桥进行方案比选和设计的。对该桥的设计，本着“安全、经济、美观、实用”的八字原则，本论文提出两种不同的桥型方案进行比较和选择：方案一为预应力混凝土简支梁桥，方案二为拱桥。经由以上的八字原则以及设计施工等多方面考虑、比较确定预应力混凝土简支梁桥（锥形锚具）为推荐方案。在设计中，桥梁上部结构的计算着重分析了桥梁在使用工程中恒载以及活载的作用利，采用整体的体积以及自重系数，荷载集度进行恒载内力的计算。运用杠杆原理法、偏心压力法求出活载横向分布系数，并运用最大荷载法法进行活载的加载。进行了梁的配筋计算，估算了钢绞线的各种预应力损失，并进行预应力阶段和使用阶段主梁截面的强度和变形验算、锚固区局部强度验算和挠度的计算。下部结构采用以钻孔灌注桩为基础的双墩柱，采用盆式橡胶支座，并分别对桥墩和桩基础进行了计算和验算。本设计全部设计图纸采用计算机辅助设计绘制，计算机编档、排版，打印出图及论文。还有，翻译了一篇英文短文“Reliabilityanalysis”。关键词：预应力混凝土、简支梁桥、钻孔灌注桩、锥形锚具、AutoCAD。1AbstractThisisapartialstructdesignofaflyovercrossingthatisovertherailwayinGaokan—Shangguanbo,accordingtodesigningassignmentandthestandardofroadandbridge.Forthepurposeofmakethetypeofthebridgecorrespondingwiththeambienceandcostsaving,thispaperprovidestwodifferenttypesofbridgeforselection:thefirstoneispre-stressedconcretecontinuousbridge;thesecondoneisdoublecantileverhalfthroughno-thrustarchbridge.Afterthecomparisonsofeconomy,appearance,characteristicunderthestrengthandeffect,thefirstoneisselected.Inthisdesign,Thecheckingcalculationofstrengthofmaingirderwasprecedednotonlyinprestressedstatementbutalsoinusingstatement,deflection,precamberandtheassessmentofreinforcingsteelbarwerecheckedtoo.Thepierofthebridgewasbasingondiggingpile,andadoptedrubberpotbearing.Accordingtothecharacteristicoftheoverpassbridgeandspotcondition,itadoptedthemethodthatthecantileverjobplacingcombinedwithbracketjobplacing.AllofthedesigndrawingswereprotractedbyAutoCAD.ExceptthatthethesiscalledAnoteondynamicfractureofthebridgebearingduetothegreatHanshin–AwajiearthquakewastranslatedintoChinese,andmadeareporton.Keywords:prestressedconcrete、AutoCAD、simplesupportedbeambridge、cast-in-placepile、coneanchoragedevice。2目录第一部分桥梁设计..........................................................................................................................1第一章水文计算......................................................................................................................11.1原始资料........................................................................................................................11.2水文计算.......................................................................................................................3第二章方案比选........................................................................................................................62.1方案一：预应力钢筋混凝土简支梁（锥型锚具）...................................................62.2方案二：钢筋混凝土箱形拱桥..................................................................................10第三章总体布置及主梁的设计..............................................................................................113.1设计资料及构造布置..................................................................................................113.2主梁内力计算..............................................................................................................12第四章预应力钢束的估算及其布置....................................................................................214.1跨中截面钢束的估算与确定......................................................................................214.2钢束预应力损失计算..................................................................................................254.3截面强度验算..............................................................................................................284.4预加内力计算..............................................................................................................344.5主梁斜截面验算..........................................................................................................354.6截面应力验算..............................................................................................................414.7主梁端部的局部承压验算..........................................................................................46第五章下部结构的计算........................................................................................................505.1盖梁的计算..................................................................................................................505.2桥墩墩柱计算..............................................................................................................575.3钻孔灌注桩的设计计算..............................................................................................59第二部分英文翻译..........................................................................................................................62Reliabilityanalysis:.........................................................................................................................62可靠性分析....................................................................................................73结束语...................................................................................................................错误!未定义书签。1第一部分桥梁设计第一章水文计算1.1原始资料1.1.1水文资料：浑河发源于辽宁省新宾县的滚马苓，从东向西流过沈阳后，折向西南，至海城市三岔河与太子河相汇，而后汇入辽河。浑河干流长364公里，流域面积11085平方公里。本桥位上游45公里的大伙房水库，于1958年建成，该水库控制汇流面积5563平方公里，对沈阳地区的浑河洪峰流量起到很大的削减作用。根据水文部门的资料，建库前浑河的沈阳水文站百年一遇洪峰流量位11700立方米/秒，建库后百年一遇推算值为4780立方米/秒。浑河没年12月初开始结冰，次年3月开始化冻。汛期一