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1、摘要摘要钢管混凝土拱桥我国近年来桥梁建筑发展的新技术,具有自重轻、强度大、抗变形能力强的优点。它较好地综合满足了修建桥梁所需求的用料省、安装重量轻、施工简便、承重能力大的诸多要求,是大跨度拱桥一种比较理想的结构形式。首次,根据设计任务要求和现行铁路桥梁设计规范,综合考虑桥位的地质、地形条件,经初选后提出了下承式钢管混凝土拱桥和预应力混凝土连续梁桥两个比选桥型。按实用、经济、安全、美观的设计原则,比较两个方案的优缺点。比选后把下承式钢管混凝土拱桥作为主推荐设计方案。然后进行结构计算,这其中最为关键的便是建模,最后的计算是否正确,在很大程度上取决于模型建得是否正确。本设计利用Mid
2、asCivil(迈达斯)软件计算,利用软件就可计算出结构各控制截面的内力。完成上述工作后需要进行应力验算。最后对桩进行了设计,并检算了桩的整体稳定性、截面压应力和合力偏心距,检算结果符合标准。关键词:桥梁设计,钢管混凝土拱桥,静力计算,动力分析,稳定性ⅠAbstractAbstractInourcountry,concrete-filledsteeltubular(CFST)archbridgehasbecomeanewtechnologyofthebridgeconstructioninrecentyears.Ithasthemeritsoflightdeadweight,g
3、reatstrengthandstrongdistortion-resistantcapacity.Itcanpreferablysatisfyrequirementssuchasthematerialsforconstructionaresaving,erectionweightislight,theconstructionissimple,andbearingcapacityisgreat.Itisakindofmoreidealstructureformforlong-spanarchbridges.First,accordingtothedesignassignment
4、andthepresentrailroadbridgedesignspecification,takethegeologicalandtopographicalconditionsofthebridgesiteforfurtheranalysis,afterpreliminaryselection,twobridgetypeschemasarepromoted,oneisCFSTarchandtheotherisprestressedconcretecontinuousgirderbridge.Basedonthephilosophyofbridgedesignas―pract
5、icability,economy,security,aesthetics‖,advantagesanddisadvantagesofbothoptionsarecompared.Next,thesecondsteptocarryoutstructuralterms,thisisthemostcrucialmodeling,thefinalcalculationiscorrect,largelydependsonthemodelbuiltiniscorrect.Thedesignofthe"MidasCivil"software,willbebuiltintoagoodmode
6、lofsoftwareandcomputingmodelparametersassignagoodmodelunit.Usingthesoftwarecancalculatethestructureinternalforceofthecontrolsection.AndAfterthecompletionofthework,theywillhavetocarryoutstructuralchecked.Finally,thestability,compressivestressandeccentricdistancesofthepilearechecked.Keywords:b
7、ridgedesign;CFSTarchbridge;staticanalysis;dynamicanalysis;stabilityII目录目录第一章,概述................................................................................11.1工程概况.................................................................................