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1、摘要长岩100m上承式钢筋混凝土箱型拱桥设计摘要根据当地工程实际的水文地质条件和施工技术指标，总结国内外钢筋混凝土拱桥的建设经验和实际运用，综合比较桥型方案选择完成100m上承式钢筋混凝土箱型拱桥设计。选择良好的天然地基基础，采用索揽预制分段吊装完成主拱圈的拼接，在拱圈上现浇施工底梁、立柱、安装盖梁，桥面用标准的预制空心板梁，再将各段现浇成一个整体。按照已有的拱桥建筑技术和经验，根据拱桥跨径、矢高计算合理拱轴系数，运用midas软件建立拱桥模型，进行细部截面形式确定和尺寸拟定，计算并导出设计标准的弯矩和轴力值。进行截
2、面配筋计算和承载力校核，检验细部截面尺寸、配筋、内力组合值、裂缝宽度是否满足设计安全，根据现有的规范来分析设计方法的正确性、内力分布的合理性及材料的充分利用，制定出一个比较合理、安全可靠、基本满足各项综合技术指标的设计方案。拱桥的历史悠久且造型美观，能够充分发挥圬工材料的抗压性能和节省材料，合理分配内力等优点，非常适合于中小跨径的桥梁建设，伴随起吊设备和架桥机的发展，缩短了建桥的工期。关键词：钢筋混凝土拱桥；midas建模；预制吊装；配筋与验算1AbstractThelongrockspanof100monthede
3、skofreinforcedconcreteboxarchbridgedesignAbstractAccordingtothelocalengineeringandconstructionofhydro-geologicalconditionsTechnicalindicatorssummarizetheexperienceandpracticalapplicationofdomesticandforeignconstructionofreinforcedconcretearchbridge,comprehensiv
4、ecomparisonbridge-programselectioncompletethe100mReinforcedConcreteBoxArchBridge.Chooseagoodfoundationnaturalfoundation,usingprecastsegmentshoistingropeembracecompletethemainarchofthestitchingonthebottomarchcastbeams,columns,beamscoverinstallation,deckwithastan
5、dardhollowbeam,andtheneachsectioncastasawhole.Inaccordancewiththeexistingbridgebuildingtechniquesandexperience,accordingtothearchspan,risehighcomputingwithrationalarchaxiscoefficient,usingmidassoftwaretobuildarchmodelfordetailedcross-sectionalformandsizeisdeter
6、minedtodevelop,calculateanddesigncriteriaderivedmomentandaxialforcevalues.Sectionedreinforcementcalculationandbearingcapacitychecking,testingdetailedcross-sectionaldimension,reinforcement,internalforcecombinationofvalues,crackwidthdesignmeetssafety,accordingtot
7、heexistingnormstoanalyzethecorrectnessofthedesignprocess,rationalityandmaterialinternalforcedistributionfulluseof,andworkoutamorereasonable,safe,reliable,integratedtechnicalindicatorsmeetthebasicdesign.Alonghistoryofbridgehistoryandbeautifulshape,givefullplayto
8、thecompressivestrengthofmasonrymaterialsandsavingmaterial,areasonableallocationofinternalforces,etc.,itisverysuitableforsmallandmedium-spanbridgeconstruction,withthedevelopm
