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1、ABSTRACTUnderthebaptismofChina’ssocialistmodernizationdrive,thenationalhighwaytrafficandurbanrailtransitexpandrapidly,bridgeconstructiongrowswitheachpassingday,peoplepaymoreandmoreattentiontothebridgeaestheticsandmakehigherrequestsforartisticeffectofthebridgeshape.Asan
2、ewtypeofbridgestructure,butterflyarchbridgeismorepopularonaccountofitsnoveluniquestyleandeasytobeinharmonywiththeenvironment.However,owingtospecializationofthearchrib,thestructurestyleandmechanicalbehaviorbecomeverycomplex.Besidesthedesignandresearchworkofbutterflyarch
3、bridgeisstillintheexploratorystage,theinfluenceofvariousdesignparametersonthemechanicalbehavioranditslawstilldon'thaveasystematicandauthoritativeconclusion,theoreticalresearchandengineeringpracticedataforreferenceareless.Therefore,itisbeofimportanttheoreticalsignifican
4、ceandengineeringpracticalvaluetodeeplystudythemechanicalpropertiesofbutterflyarchbridge.TakingHefeiaspecialshapesteel-concretecompositestructurebutterflyarchbridgeasresearchbackgroundinthispaper,aswellasestablishingspacefiniteelementmodelofthestructurebyuseofMIDAS/Civi
5、lsoftware.Staticbehavior,stability,naturalvibrationcharacteristicsandseismicresponseofspecial-shapearchbridgerepresentedbythebutterflyarchbridgearestudiedonthisbasis.Themainresearchcontentsareasfollows:Firstly,thefiniteelementtheoryofbridgestructureanalysisisintroduced
6、.Displacement,internalforceandstressofthearchribunderpartialloadandloadcombinationsinfinishedbridgeoperationstageareanalyzedbasedonthespacefiniteelementmodelofbutterflyarchbridge,afterthatcomparedtheinfluencedegreeofvariousloadsonthestructure.Secondly,thispaperdescribe
7、sthebasictheoryofstabilityforarchbridge.Bymeansofthefiniteelementmethod,linearelasticstabilitysafetyfactorandcorrespondingbucklingmodesofbutterflyarchbridgeunderdifferentdeadloadandliveloadcombinationsareanalyzed.andtheimpactofratioofrisetospan,archribextroversiveangle
8、andstiffnessonthestabilityofthewholebridgeisdiscussed.Thirdly,abriefintroductiontotheoreticalanalysismethodandfinitee
