空间网壳结构稳定性研究英文.docx
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空间网壳结构稳定性研究英文.docx
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空间网壳结构稳定性研究英文
Fastingnetsshellstructurestaticstabilityandlimitbearingcapacityoftheresearch
Abstract:
basedonanemptystomachdomestructures'staticstabilityanditslimitbearingcapacityproblem,theapplicationofthenonlinearfiniteelementmethodisstudied.Thecharacteristicvalueofbucklinganalysisandnonlinearbucklinganalysisoftwowayanalysisexaminesthehollownetshellbucklingofmodalandinstabilityandtheentireprocessthroughthescaleofthegeometricparameteranalysis,obtainstherise-spanratiosare,netshellthickness,abdomenstemsectiontakedifferentparameterssuchasthestructureofthevalueofultimatebearingcapacity,andwithsinglereticulatedshellscompared.Theresultsshowthat,hollownetsshellstructurebythewholeinstabilityisgivenpriorityto,steelquantityinthesamelimitbearingcapacityofthesinglenetshellstructurethanraise2.87timesonthenetshellstructurehasbothsinglenetshellstructureissimpleandbeautiful,andadouble-layerreticulatedshellofgoodstabilityandtheadvantageofhighbearingcapacity,anditisagoodstructure.
Keywords:
hollownetshellstructure;Geometrynonlinear;Limitbearingcapacity;Singlenetshellstructure
0introduction
Netshellstructureisacurvedshapespacegridstructure,asingle
Netshellandthedoublelayernetshelldivision,isalong-spanspacestructure.Kindofdecisivemainstructureform[1].Singlenetshellstructureform.Typeandbeautiful,thestructureissimple,butitsstabilityproblems,material.Thestrengthofthematerialcanbefullyplay.Double-layerreticulatedshellforceperformancesbetter,butstemaisvarious,influencetheconstructioneffectonthenetshellstructure
Indouble-layerreticulatedshellisintroducedonthebasisoftheconceptofanemptystomach,gotoInadditiontothewebmembersintoanewandmodernspacereticulatedshell,Canachievesinglenetshellstructurestemacleareffect,andcantoimprovethestabilityofthesinglenetshellstructure[2-3].Sinceour2006usinghollownetsshellstructurebuiltsign.Sexbuildingsincethenationalgrandtheatre,thiskindofstructurescholars'widely.Extensiveattention.Previously,only1990ofthefinishedbuildingtheJapaneseakita.Theskydomeusedhollownetshellstructure.Atpresentnetshellonanemptystomach
Structureoftheresearchliteratureless,[2]tohollownetshellstructure
Thestaticanddynamicperformanceofbasicresearch,theliterature[3]toempty.Abdominalreticulatedshellsseismicanalysis,understandthehollownetshell"Structureseismicperformance,buttheanalysisparametersforless.Becausenetshell"onanemptystomach.Structureisanalyzedbymanyfastingarchstructureofthecomposition,theliterature[4]onanemptystomach.Thearchstructuremechanicsperformanceanalysis,tounderstandthehollownetshell"Resultsoftheforcetransmissionmechanismandloadfeatureshelp.Inordertodeeply
Masterhollownetsshellstructurestaticstabilityandthelimitofthebearing.Force,theauthorfurtherapplicationnonlinearfiniteelementmethodarestudied,Calculatedbythedifferentrise-spanratiosare,netshellthickness,abdomenstrutsectionconfiguration.Structureofultimatebearingcapacity,andtounderstandthestructureandnetshellonanemptystomach.Othertypespacestructureoftherelativemechanicalproperties,andsingle.Netshellstructureanalysis.
1calculationmodelandparameteranalysismethod
Toillustratethestressofthehollownetsshellstructureperformanceandcharacteristics,chooseplaneroundorthogonalhollownetshellstructureastheresearchobject,asshowninfigure1.Structurespan120m,thenetshellthicknessof2m,gridhorizontalplaneProjectionsize6mx6m,supportingconditionsforeachnodecircletothreeHingebranch;Themodelrise-spanratiosareH/L,netshellthickness,abdomenstrutsectionfeet"Forvariableparameter.ConsideringtheinitialdefectswhenapplyingformaximumdefectsL/300consistentmodaldefects(totakethebucklingcharacteristicvalueofthefirstorder).
2thestaticstabilityanalysis
2.1analysis
Staticstabilityanalysisisthenetsshellstructurestudykeyasked
Questions.ThepurposeofthestabilityanalysisistodeterminethestructureofthebalancefromstableStateintounstableequilibriumconditionofcriticalloadandbucklingModalshape.WidelyadoptedtwokindofmethodisidealstructureofthespecialEigenvaluebucklinganalysisandnonlinearbucklinganalysisprocess[5].FeaturesValuebucklinganalysisisusedtopredictaidealstructuretheoryofelasticruthlessMusicintensity,theadvantageisacomplexnonlinearanalysisofneed,canThestructureisobtainedthecriticalloadandbucklingshape,andforthenon-linearBucklinganalysisprovidesreferenceloadvalue.Nonlinearbucklinganalysisareconsideringnetshelldeformationofthestructuralinternalforceinfluence,netsshelltheflatBalanceequationbasedonthedeformationafterbasis,itisrealReflecttheactualsituationofthestructure,theauthorhasusedthespacebeamyuanandThearcoffosteringbothnonlinearbalancelinetracking,researchofthestructureStablecharacteristics[6].
2.2hollowreticulatedshellbucklingcharacteristicvalueofmodal
TomasterastructureoftheultimatebearingcapacityofthenonlinearchangesRule,thestructureofthecharacteristicvalueofbucklinganalysisisnecessary.BaseThestructureofthefirstfourordercharacteristicvaluebucklingmodesasshowninfigure2shows.Special
Eigenvaluebucklingmodalanalysisresultsshowthattheorthogonalhollownetshell"Resultsofafeworderbeforebucklingmodesarewholebucklingprimarily,thisandsingleLayerreticulatedshellbucklingisdifferentfromthatofthewholestructureStiffnessisbetter;Inadditionthefirst-ordermodalanalysisshowsthatthe"Resultsofatorsiondeformation,surfaceofshearrigidityinshortage.
2.3CanShuFenXi
Rise-spanratiosareshellclassstructureisasensitiveparameters,thesizeofitDirectlyaffectthestructureofmechanicalproperties,takethefollowingfourrise-spanratiosareH/L=1/5,1/6,1/7,1/8foranalysis;TakethefirstordercharacteristicvaluetheruthlessQuMoconditionastheinitialdefects,defectsizeisL/300.Figure3givesFourrise-spanratiosaredown,themaximaldisplacementoftheloadattheforce-displacementcurve,noWithrise-spanratiosaretheultimatebearingcapacityunderrespectively:
44.16,39.73,
33.89,30.72kN/m2.Thefigure3shows,withrise-spanratiosareincreasedPlus,structurestiffnesswillincrease,limitbearingcapacityislinearincrease."Structuretolimitbearingcapacityintheflatcurve,bearingcapacitynotsuddenlyDrop,isakindofductilitydamage,thissinglenetshellstructurewiththegeneralDifferent.
Netsshellthicknesschangesonthehollownetshellnonlinearstabilityinfluence.Analysis,structuremodelandotherparametersagain,butacrosstheboltsMorethan1/5forsure,andselectthefollowingfournetsshellthickness:
1,1.5,2,2.5m.infourdifferentthickness,defectsoffastingnetsshellacknowledgeLoad-thedisplacementcurveasshowninfigure4shows.Thefigure4,itnotincrosssectionChange,withnetsshellthicknessincreases,withthestructurestiffnessTheincrease,limitbearingcapacityisalsoincreasing,buttheultimatebearingcapacityincreaseThelargeamplitudereducegradually.SohollownetsshellstructureofthenetshellthicknessHadapropervalue,canmaketheresulthasthebesteconomy.Abdominalleverintheroleoffastingnetsshellisveryimportant,anditevenPickupanddowntwolayerchord,toworktogether,thesectionsizeofchange,Thestructureofthemechanicalpropertiesofexactlyhowmuchinfluenceitisremarkable.VentralstrutsectionsizedirectlyaffectthestructurestiffnessandextremelyLimitbearingcapacity.Analysis,stilltakethecalculationmodeloftheabove,rise-spanratiosare1/5,netsshellthicknessof2m,abdominalstemselectionfivesectionsize,suchastable1Shows,withtheotherparameters.Amongthem,thirdsectionasthefoundation,Increaseanddecreaserespectivelyfromeachtwosection,taketheabovesectionoftheeyeTostudysectionstiffnesschangesinthemultiple,fastingnetsshellstructureStiffnessandthechangesofultimatebearingcapacity,soastoreasonablyselectabdomenOneofthestemsectionqualitativegrasp.Thecalculationresultsasshowninfigure5And,fromthefigure5showsthatfastingnetsshellstiffnessofthesectionsizeincreaseBigandincrease,theultimatebearingcapacityandwillalsoincrease,butsectionfeet"Increasestocertaindegree,theeffectsnolongerapparent.
3conclusion
(1)theundersideofthecircleonanemptystomachfororthogonalreticulatedshellinthestaticUndertheactionofstabilityanalysisresultsshowthat:
thestructurebythefirstorderBucklingmodaldeformationisgivenpriorityto,thewholestructuredemonstratesthebucklingoccurs,structureandnodeclinedobviously,andforductilitydamage.
(2)differentparameteranalysisresultsshowedthat:
vectorthan"acrossThestructurehasgreatinfluenceontheultimatebearingcapacity,alongwiththenetsshellthicknessorwebmembersTheincreaseofcrosssection,structurelimitbearingcapacityincrease.
(3)isorthogonalhollownetsshellstructureandorthogonalsinglenetshellThestructureofultimatebearingcapacity,orthogonalhollownetsshellstructurethatthegreatLimitbearingcapacityisorthogonalsinglenetshellhasgreatlyimproved.
References:
[1]董石麟,罗尧治,赵阳.DaKuaDuKongJianJieGouDeGongChengShi
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