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1、西安建筑科技大学硕士学位论文西安建筑科技大学硕士学位论文ResearchontheFatigueAnalysisMethodsofWeldingStructureandAppliedtotheTowerCraneBoomSpeciaity：MechanicalandElectronicEngineeringName：WangXingluInstructor：Prof.HeLileAbstractWeldingstructurefatigueisaverycomplexissueinvolvingmanyfactors
2、inthecourseofthestudy,combinedwithsignificantgapbetweentheactualoperatingconditionsandtheexperimentalconditionsofthestructure,researchershavedonealotofworkinthisregardandachievedcertainresults,buttheyhavenotobtainedamoreversatileandpreciseconclusionsformetalfat
3、iguestrengthandfatiguelifeofweldedstructures.Towercraneisatypicalmetalweldedstructure,itsloadfactorandbusydegreesalsoincreasedsignificantlywiththerapiddevelopmentoftheconstructionindustry.Inrecentyears,thetowercraneaccidentsoccursometimesandanupwardtrend,alarge
4、partofthetowercraneaccidentscausedduetothefatigueofstructuralpartsaccordingtoindustrysurveys.Thebasicknowledgeofthetheoryoffracturemechanicsandthetheoryofstructuralfatigueanalyzedinthispaper,theloadconditionsoftowercraneandthefatiguetypeofweldingstructure,theme
5、thodusedtocalculationthefatiguelifeofthetowercranesummed.TakeQTZ40towercraneproductioninafactoryofShaanxiProvinceastheresearchobject,thesolidfiniteelementmodelofsinglesectionofthetowercraneboomestablishmentandthesizeanddistributionoftheweldingresidualstressweld
6、ingofstructuralcalculated.AgainstthecharacteristicsoftheTowercraneboomstructural,differentweldingprogramshavedevelopment,weldingresidualstressunderdifferentweldingsequencecalculatedbythefiniteelementanalysissoftware,theimpactonweldingresidualstressofweldingsequ
7、enceandtheimpactonfatiguelifeofloadstructureofweldingresidualstress.ThefiniteelementmodelofQTZ40towercraneboomestablished,weldingresidualstressisappliedonthefiniteelementI西安建筑科技大学硕士学位论文model,stresssizeanddistributionoftowercraneboomundervariousconditionsarecalc
8、ulationaccordingtotheliftingcurve.Combinedwithactualoperatingdataofthesametypeoftowercraneinreferences,establishedloadspectrum,thefatiguelifeoftowercraneboomiscalculatedbyfa
