松岙大橋的穩(wěn)定及動力特性仿真分析.pdf

1、浙江大學(xué)建筑工程學(xué)院碩士學(xué)位論文松岙大橋的穩(wěn)定及動力特性仿真分析姓名：鄭永衛(wèi)申請學(xué)位級別：碩士專業(yè)：建筑與土木工程指導(dǎo)教師：項貽強20080501AbstractTheconcretefilledsteeltube(CFST)TrussTILAN—typearchesimprovethelateralstabilitybyslopingthearchrib，itisoftenusedinthedesignsofCFSTarchbridg

2、ewithsmallratioofthewidthtothespanSongAoCFSTarchbridgeisasymmetrichalfthroughecardinatearchthestructureofarchribadoptsflat—facedtrussform。Basedonthedesignfeatureofthisbridge，thestabilitybucklingandnaturalvibrationfeature

3、areanalyzedinthepaperThepaperintroducesdevelopmentandpresentsituationoftheCFSTarchbridgefirstlyBaseonthesummaryofthearchesbridge’Sadvantage，thecurrentstudyconditionsofstabilityanddynamiccharacteristicsareanalyzedindetail

4、sinthepaperThenthebasictheoriesandsolutionmethodsofCFSTarchbridgearefu_rtherintroducedThesoftwareANSYSisusedtoanalyzethelinearbuckling，thegeometrynonlinearbucklingcombiningwiththecharacteristicsandmechanicalresearchfindi

5、ngsofthisbridge。Inordertoconsiderthenonlinearbehaviorofmaterial，thestress—strainrelationshipofconcretefilledsteeltubestructureisintroducedinthefollowingresearchTheanalysisresultshowsthatthestabili夠factorofthebridgeisbigg

6、erinthelinearandelasticcondition，whilethevalueofthestabilitycoefficientonlydecreasedaliRIewhentakingintoaccountgeometricalnonlinearityButwhenthegeometricalnonlinearityandmaterialnonlinearityaleallconsidered，thevalueofthe

7、stabilitycoefficientgreatlydecreasedItalsoshowsthattheinstabilityofCFSTarchbridgealmosthappensintheplasticarea，andstressoftheinstabilityisbiggerthanthehigh—pointedoftheelasticstressThestabilityfactorwillbeverybiggerifthe

8、linearmethodisusedinanalyzingthestabilityofthebridgeSotheultimateloadingisexactonlywhenweconsiderthegeometricalnon—linearityandmaterialnon—linearityDuetoCFSTarchbridgehascharacteristicsoflargedeformationandlargestrainsta

9、bilityofthisbridgeiscomputedthroughconsideringgeometricalnonIinearitytheanalysisresultshowsthatlateraldirectionandverticaldirectiondisplacementofarchribislargeHoweverafterconsideringbothgeometricalnon—linearityandmateria