多跨拱梁组合桥设计研究.docx

多跨拱梁组合桥设计研究
摘要
多跨拱梁组合桥是一种常见的铁路和公路桥梁结构，其结构特点为多跨拱梁受力和变形积聚一定的影响，需要进行充分的设计和优化。本文针对多跨拱梁组合桥的特点，介绍了多跨拱梁组合桥的结构设计、施工方法、力学行为以及优化方法，并将其应用于某铁路桥梁的设计实例。研究表明，多跨拱梁组合桥的结构设计应重视拱形和梁桥的相互作用，采用合理的施工方法和预应力构件可以有效控制变形和缩小施工期，优化设计可以降低成本和提升结构的承载能力。
关键词：多跨拱梁组合桥；结构设计；施工方法；力学行为；优化方法
Abstract
Multi-spanarchbeamcompositebridgeisacommonrailwayandhighwaybridgestructure,itsstructuralcharacteristicsaremulti-spanarchbeamstressanddeformationaccumulationofacertainimpact,requiringfulldesignandoptimization.Thispaperintroducesthedesign,constructionmethod,mechanicalbehaviorandoptimizationmethodofmulti-spanarchbeamcompositebridgebasedonitscharacteristics,andappliesittothedesignexampleofarailwaybridge.Thestudyshowsthatthestructuraldesignofmulti-spanarchbeamcompositebridgeshouldpayattentiontotheinteractionbetweenarchandbeambridges,reasonableconstructionmethodandpre-stressedcomponentscaneffectivelycontroldeformationandreduceconstructionperiod,andoptimizationdesigncanreducecostsandenhancestructuralbearingcapacity.
Keywords:Multi-spanarchbeamcompositebridge,structuraldesign,constructionmethod,mechanicalbehavior,optimizationmethod
1.Introduction
Multi-spanarchbeamcompositebridgeisabridgestructurecomposedofmultiplearchesandbeams.Itischaracterizedbycarryinglargeloadsandhavinglargespans,whichmakesitwidelyusedinrailwayandhighwaytransportation.However,thecomplexstructuralsystemalsobringsmanytechnicalchallengestothedesignandconstructionofmulti-spanarchbeamcompositebridges.Therefore,itisnecessarytoconductin-depthresearchonthestructuraldesign,constructionmethod,mechanicalbehaviorandoptimizationmethodofmulti-spanarchbeamcompositebridges.
2.StructuralDesign
Thestructuraldesignofmulti-spanarchbeamcompositebridgeshouldtakeintoaccounttheinteractionbetweenthearchandbeambridges.Undertheload,thearchandbeambridgesworktogethertosupporttheloadandtransfertheloadtotheabutmentandpier.Thearchesmainlyresisttheverticalloadandthehorizontalthrustgeneratedbythearchring,whilethebeamsmainlyresistthelateralloadandthelongitudinalshearforce.Thecros