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《邯济扩能改造工程第五施工处津浦铁路特大桥(45+70+45)m连续桥上部结构设计完整版毕业论文》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、邯济扩能改造工程第五施工处津浦铁路特大桥(45+70+45)m连续桥上部结构设计摘要预应力混凝土连续梁是现在广泛使用的一种体系,主要适用于大跨度梁桥。它具有变形小,结构刚度好,行车平顺舒适,伸缩缝少,养护简易,抗震能力强等优点。而且采用了预应力筋,增加预应力筋能充分发挥高强材料的特性,具有可靠的强度、刚度和抗裂性能,耐久性强,材料可塑性强,便于建筑艺术处理,也容易满足桥梁曲线和坡度的要求。当桥跨增大时,在荷载作用下,连续梁桥的中间节点截面处将承受较大的负弯矩,从绝对值来看,支点负弯矩远大于跨中正弯矩。采用变截面梁(支点处梁高增大,跨中梁高减小,其间按曲线或折线过渡)更能适用
2、结构的内力分布规律。常采用悬臂法施工,变截面梁的受力状态与其施工时的内力状态基本吻合,更适用于大跨度预应力混凝土连续梁桥,其外形和谐,节省材料并可增大桥下净空,是大跨度桥梁的优选方案。本设计包括上部结构尺寸的拟定、内力计算、配筋、验算、施工问题的研究等。本设计题目为:三跨(45+70+45m)预应力混凝土变截面箱型连续梁桥。它具有变形小,结构刚度好,行车平顺舒适,伸缩缝少,养护简易,抗震能力强等优点。而且采用了预应力筋,增加预应力筋能充分发挥高强材料的特性,具有可靠的强度、刚度和抗裂性能,耐久性强,材料可塑性强,便于建筑艺术处理,也容易满足桥梁曲线和坡度的要求。关键词:预应
3、力、连续梁、上部结构、内力计算、配筋、验算、施工abstractPrestressedconcretecontinuousbeamisnowwidelyusedasystem,mainlyissuitableforthelargespanbridge.Ithaslittledeformation,structurestiffness,drivingsmoothandcomfortable,lessexpansionjoints,easymaintenance,seismicability,etc.Andthetendons,increasetendonsthatcangiv
4、efullplaytothecharacteristicsofthehighstrengthmaterialswithreliablestrength,stiffnessandcrackresistance,durabilitystrong,materialplasticity,facilitatearchitecturalartprocessing,alsoeasytomeettherequirementsofthebridgecurveandslope.Whenthebridgespansincreases,theunderloadofcontinuousgirderb
5、ridgeformiddlesectionofthenodewillbearlargerinthenegativemoment,fromabsolutevalueperspective,thefulcruminthenegativemomentfaroutweighthecrossCKSbendingmoment.Thevariablebeamcanbeappliedtotheinternalstructuremoredistributionrule.Oftenthecantileverconstructionmethod,becomebeam'sstressstatean
6、ditsconstructionofinternalforceofthestateresults,moresuitabletothelargespanprestressedconcretecontinuousgirderbridge,itsappearanceisharmonious,savematerialandcanincreasetheobstacleclearanceunderthebridge,isthelargespanbridgeoptimization.Thisdesignincludingtheupperstructuresizeoftherecommen
7、ded,internalforcecalculation,reinforcement,checkingandconstructionproblemsoftheresearch,etc.Thisdesigntopicfor:threecross(45+70+45m)prestressedconcretecontinuousgirderbridgevariablecross-sectionofthebox.Ithaslittledeformation,structurestiffness,drivingsmoothan