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二○一五届毕业设计***河连续刚构桥学院：公路学院专业：桥梁工程姓名：学号：指导教师：完成时间：2015.06.14二〇一五年六月毕业设计报告摘要根据设计任务书要求，依据现行公路桥梁设计规范，综合考虑桥位的地质、地形条件，提出了独塔斜拉桥、上承式钢管混凝土拱桥和预应力混凝土连续钢构三个比选方案。按“安全、经济、适用、美观和有利于环保”的桥梁设计原则，分析了三个方案的优缺点。推荐预应力混凝土连续刚构作为设计方案。推荐方案以基本设计理论为基础，参考国内外成功的大跨连续钢构桥，拟定了95417095mmm的跨径，主梁采用1.8次抛物线变梁高的单箱单室箱主梁，桥墩为双薄壁空心墩，桥台为轻型桥台，基础为群桩基础，施工阶段采取挂篮悬臂现浇法。对推荐方案进行了结构细部尺寸拟定，对上部结构和下部结构进行了内力计算、配筋设计及控制截面强度、应力验算，变形验算等。经分析比较及验算结果表明该桥梁设计合理，符合设计任务的要求。关键词：预应力混凝土连续刚构，钢管混凝土拱桥，斜拉桥，悬臂现浇，应力验算毕业设计报告ABSTRACTAccordingtothedesignrequirements,theexistingdesignspecificationofhighwaybridge,consideringthegeologyandterrainconditionsofthebridgesite,afterpreliminaryselection,threebridgetypeschemasarepresented,theyarecable-stayedbridge,archbridgeandprestressedconcretecontinuousrigidframebridge.Thencomparingtheadvantagesanddisadvantagesofthreeoptionscomprehensivelybythephilosophyofbridgedesignas“Security,Economy,Application,BeautyandEnvironmentalProtection”.ThePCcontinuousrigidframebridgeisselectedastherecommendedschemeaftertheselections.Thisprojectisbasedonthebasictheoryofbridgedesignandtakethedomesticandinternationalsuccessfuldesignsforexample,finallychoseaspancombinationof95417095mmm.ThedepthofSinglecellboxgirdervariesasthesecond-degreeparabola,thepierisadoublethin-wallhollowpier,theabutmentislightabutment,thefoundationisgroupedpilesfoundation,andthethehangingbasketcantilevercastingconstructionmethod.Throughdrawingupofstructure’sdimensionandthendesigntheupperandlowerpartofthestructure,suchascalculatedtheinternalforceofdeadandlivingload,prestressedsteeldesign,checkingthestrengthandstressofcontrolcross-section.Finally,checkforliveloaddeformation.Checkedbythecomparisonandanalysisshowthatthedesignmethodofcalculationiscorrect,andthedistributionofreinforcementisReasonable,sothisdesignmeetthedesignrequirements.Keyword:prestressedconcretecontinuousrigidframebridge,doublethin-wallhollowpier,cantilevercastingconstruction毕业设计报告目录第一章概述································11.1地质条件······························11.2主要技术指标····························11.3设计规范及标准···························1第二章方案比选·······························22.1概述································22.2比选原则······························22.3比选方案······························22.3.1预应力混凝土连续刚构桥···················22.3.2上承式钢管混凝土拱桥····················32.3.3独塔斜拉桥··························42.4方案比较······························5第三章预应力混凝土连续梁桥总体布置···················83.1桥型布置······························83.2桥孔布置······························83.3桥梁上部结构尺寸拟定·······················83.4桥梁下部结构尺寸拟定·······················103.5本桥使用材料···························113.6毛截面几何特性计算························11第四章荷载内力计算···························124.1模型简介·····························124.2全桥结构单元的划分························124.2.1划分单元原则························124.2.2桥梁具体单元划分······················124.3全桥施工节段的划分························124.3.1桥梁划分施工分段原则····················124.3.2施工分段划分························134.4恒载、活载内力计算························144.4.1恒载内力计算························144.4.2悬臂浇筑阶段内力······················154.4.3边跨合龙阶段内力······················16毕业设计报告4.4.4次边跨合龙阶段内力·····················174.4.4中跨合龙阶段内力······················184.4.5活载内力计算························194.5其他因素引起的内力计算······················214.5.1温度引起的内力计算·····················214.5.2支座沉降引起的内力计算···················234.5.3收缩、徐变引起的内力计算··················244.6内力组合······························274.6.1正常使用极限状态的内力组合················274.6.2承载能力极限状态的内力组合················274.6.3主要荷载组合························27第五章预应力钢束的估算与布置·····················315.1钢束估算·····························315.1.1按承载能力极限计算时满足正截面强度要求··········325.1.2按正常使用极限状态的应力要求计算·············325.2预应力钢束布置··························355.3预应力损失计算··························365.3.1预应力与管道壁间摩擦引起的应力损失············365.3.2锚具变形、钢筋回缩和接缝压缩引起的应力损失········375.3.3混凝土的弹性压缩引起的应力损失··············375.3.4钢筋松弛引起的应力损失···················385.3.5混凝土收缩徐变引起的应力损失···············385.3.6有效预应力计算·······················405.4预应力计算····························41第六章强度验算·····························416.1正截面承载能力验算························416.2斜截面承载能力验算························43第七章应力验算······························447.1短暂状况预应力混凝土受弯构件应力验算··············457.1.1压应力验算·························457.1.2拉应力验算·························457.2持久状况正常使用极限状态应力验算···············467.2.1持久状况(使用阶段)预应力混凝土受压区混凝土最大压应力验算467.2.2持久状况(使用阶段)混凝土的主压应力验算··········46毕业设计报告7.2.3持久状况(使用阶段)预应力钢筋拉应力验算··········46第八章抗裂验算······························508.1正截面抗裂验算··························508.2斜截面抗裂验算··························51致谢····································53参考文献··································54毕业设计报告第一章概述1.1地质条件图1-1桥址纵断面图1.2主要技术指标桥面净宽：2×12m＋0.5m（分离式）设计荷载：公路－Ｉ级行车速度：80km/h桥面横坡：2%通航要求：无温度：最高年平均温度34℃，最低年平均温度-10℃。1.3设计规范及标准1、《公路桥涵设计通用规范》（JTGD60-2004）。2、《公路桥涵地基与基础设计规范》（JTGD63-2007）。3、《公路桥涵施工技术规范》（JTJ041-2000）。4、《公路钢筋混凝土及预应力混凝土桥涵设计规范》（JTGD62-2004）。5、《公路桥涵圬工设计规范》（JTGD61-2005）毕业设计报告第二章方案比选2.1概述桥式方案比选是初步设计阶段的工作重点，一般要进行多个方案比较。各方案均要求提供桥式布置图，图上必须标明桥跨位置，高程布置，上、下部结构形式及工程数量。对推荐方案，还要提供上、下部结构的结构布置图，以及一些主要的及特殊部位的细节处理图。设计方案的评价和比较，要全面考虑各项指标，综合