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1、摘要预应力混凝土连续箱梁桥结构刚度大,动力性能好,主梁变形挠曲线平缓,有利于高速行车,连续梁在活载作用下,因主梁连续产生支点负弯矩,对跨中正弯矩有卸载作用,其弯矩分布较合理。目前在公路桥梁工程中应用非常广泛。本设计主梁就选用了预应力混凝土连续箱梁,完成了营双高速公路马跑沟河大桥4×30m连续箱梁桥的设计。大桥正跨马跑沟河,为“U”字形河谷,工程地质分区属于冲洪积平原地址区,桥址位于管子沟河道及两岸,河道两岸地势较为开阔。在本次设计中,首先进行了桥址资料和设计标准的阐述,然后确定了预应力混凝土连续箱梁桥为本设计采用的方案,就其进行了结构设计,设计的主要内容有:拟定截面尺寸;
2、计算控制截面的设计内力及其相应的组合值;估算预应力钢筋的数量并对其进行布置,边跨采用42根15.2的预应力钢绞线,N1每束6根,N2、N3、N4每束5根。在中跨跨中采用38根钢绞线,N1、N2、N3每束5根,N4每束4根;计算主梁截面的几何特征值;承载能力极限状态验算和正常使用极限状态验算;正常使用极限状态下构件抗裂性及变形验算;持久状态下和短暂状态下构件截面应力验算。经检算,设计的桥梁结构安全,合理,并满足现行规范的要求。关键词:预应力、连续箱梁、方案比选AbstractPrestressedconcretecontinuousboxgirderbridgestruct
3、urestiffness,gooddynamicperformance,deformationofmaingirderdeflectioncurveisgentle,highspeeddriving,continuousbeambridgeunderliveload,becausethegirdercontinuousgenerationofnegativebendingmomentofthesupportingpoint,thespanisbendingmomentunloadingeffect,andthebendingmomentdistributionmorere
4、asonable.Atpresent,intheroadandBridgeEngineeringinawiderangeofapplications.Thedesignofmaingirderwithprestressedconcretecontinuousboxgirder,completedthedesignof4×30mcontinuousboxbeambridgeovertheMapaogouriverfromtheYingShuangfreeway.ThebridgeistomounttheMapaogouriver,"U"shapedValley,engine
5、eringgeologicalzoningbelongstothealluvialplainofaddressarea,bridgeislocatedatRiverandcrosspipeditch,rivermoreopenterrain.Inthisdesign,thefirstsuchmaterialanddesignstandardpaper,andthendeterminedtheprestressedconcretecontinuousboxgirderbridgeforthisdesignUSESthescheme,thestructuredesign,th
6、edesignofthemaincontent:formulationofsectionsizecalculationcontrolsection;theforceanditscombinationvalue;estimationofprestressedreinforcementquantityanditslayout,sidespanwith42rootdiameter15.2prestressedsteelstrand,N1eachbundleof6root,N2,N3,N4eachbundleof5root.Inthespanof38steelstrand,N1,
7、N2,N3eachbeam5,N4eachbundleof4root;calculationofgirdersectiongeometriccharacteristicvalue;normalsectionandinclinedsectionbearingcapacitychecking;normallimitconditionofcrackresistanceanddeformationcalculation;persistentstateandtransientstateunderthesectionstresscalcu