具有初始幾何缺陷的半剛性連接平面鋼框架穩(wěn)定承載力分析.pdf

1、寧波大學碩士學位論文具有初始幾何缺陷的半剛性連接平面鋼框架穩(wěn)定承載力分析姓名：李曉娟申請學位級別：碩士專業(yè)：工程力學指導教師：王新堂@IIAnalysisofBearingCapacityofStabilityofSteelFramewkswithSemirigidConnectionGeometricalImperfectionAbstractTheequilibriumdifferentialequationsofelementsa

2、reestablishedbasedontheclassicalfmulasofmaterialmechanicsthestiffnessmatrixofthenonlinearanalysisareobtainedinthethesis.Meanwhileahalfwavedistributionisassumedfthegeometricalimperfectioninelementsarotationrigidityfactisd

3、efinedasthestiffnessparameterofsemirigidconnectionsfinallytheoverallequationofsteelframeisestablishedtheprogramisdevelopedwithVisualFtran.Afterintroducingthemethodofnonlinearproblemindetailtheloadcontrolmethodisappliedto

4、solvetheglobalequationwithusingtherevisedNewtonRaphsonprocess.Accdingtotheultimatebearingcapacityofplanesteelstructurestherelationoftheverticalloadwithhizontalfceunderthedifferentvalueaswellasthedifferentdistributionofth

5、einitialgeometricalimperfectiontheconclusionscanbeachievedasfollows:Theadverseinfluenceofthegeometricalimperfectiontothestabilityofthewholestructureislargerifthestiffnessofconnectionsisbetween6.095105kNcmrad1.163102kNcmr

6、adwhentherearegeometricalimperfectioninthestructure.Thenegativeeffectofthegeometricalimperfectiontothestabilityofthewholestructureisbiggerifimperfectpartsofstructurearemethevalueofthegeometricalimperfectionisbigger.whent

7、hevalueofinitialgeometricalimperfectioniscertainthedifferentinfluencetostabilityofthewholestructurecanbecausedbydifferentdistributionofthegeometricalimperfection.Generallytheultimatebearingcapacityofplanesteelstructuresi

8、ssmallerwhenthereisthegeometricalimperfectionincolumnsofbottomsties.Fdoublesteelframesthenegativeeffectofthegeometricalimperfectioninthesidecolumnsofthewholestructureisbiggerthaninthedlecolumnsofthewholestructure.Whenthe

9、geometricalimperfectionexistsincolumnsoflowerstiesredistributionoftheinternalfcesbendingdefmationofthewholestructurewillhappenfthestressbalancedisttioncodination.Thisdisplaysthecomplexityofthedisttion.Insummaryeffectofth

10、esizedistributionofinitialgeometricalimperfectionontheglobalstabilityofsteelframewkswithsemirigidconnectionshouldnotbeneglectedtheimpactofinitialgeometricalimperfectionshouldbeconsideredpossiblyindesignconstructionofproj