自锚式悬索桥与上承式拱桥组合体系桥梁的稳定性分析

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1、西南交通大学硕士研究生学位论文第

2、I页1AbstractStabilityissueisfrequentlyencounteredinbridgeanalysis，whichisoneofthemainissuesthatrelatedtothesafetyandtheeconomyofthestllJcture，andhasthesalneimportantsignificanceasstrengthissue．Inthisthesis，aschemeinthepreliminarydesignofTaohuayubridgeistakenasengineeringbackground．Th

3、estabilityandtheultimatebearingcapacitythatconsideringgeometricalnon--linearityandmaterialnon-·linearityofthestmcturearediscussed．Also，thecomparisononthestabilityandtheultimatebearingcapacityconsideringdoublenon-linearityofthedeckarchbridgeisdone．。Firstly,therelatedtheoryofthestabilityandtheultimate

4、bearingcapacityofbridgesarepresented．Theclassificationandthefinitemethodofthegeometricalnon—linearity,thefiIlitemethodandyieldcriterionsofthematerialnon．1inearity,convergencecriterionsandsolvingmethodsofthenon—linearityissuearealsointroduced．Allthesesuggestthenecessityofstabilityanalysisforthecombin

5、edstIucturalsystembridge．Secondly,thedeadloadequilibriumstateandthetransfermechanismofthecombinedstructuralsystembridgeunderliveloadarereserachedbasedonthedeflectiontheory．Then。thestabilityandtheanalyticalapproachesofthestructurearediscussed．Theconclusionsshouldbeusefulinthedesignandanalysisofthecom

6、bineds仃ucturalsystembridge．Finally,thefiniteelementsoftwareANSYSisadoptedtostudythelinearelasticstability,thegeomelricnon—linearitystabilityandtheultimatebearingcapacityconsideringthegeometricalandmaterialnonlinearityofthecombinedstructuralsystembridge，alsotheinfluenceofinitialimperfectiononthestruc

7、tureisresearched．Then．thesameanalysisisalSOadoptedonthedeckarchbridgewiththesamespaninordertofindoutthedifferencesbetweenthestabilityofthesetwos缸1lctllres．Theconclusionsprovidesomereferencesonstudyingtheoperationmanagementofthecombineds缸ucnlralsystembridge．Thedeadloadequilibriumstateandthetransferme

8、chanismofthecombinedstructuralsystembridgeunderlive10adarereserachedinthisthesis．Meanwhile，thetheoricalmethodofstabilityanalysisforthisstIuctl】I．eisintroduced．Also．thefiniteelementmethodisadoptedtostu