屈服分析法Yieldanalysis.docx

屈服分析法Yieldanalysis.docx

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屈服分析法Yieldanalysis

屈服分析法（Yieldanalysis）

屈服分析法（Yieldanalysis）

Theyielddiscriminationmethodanditsengineeringapplicationforseismicdesignofbuildings

WeiLianWangSen

Shanghaiweilianengineeringstructuredesignoffice（shenzhendepartment）

YieldPredictionMethodandItsApplicationinSeismicDesignofBuildingStructure

[abstract]

Inthispaper,theyieldcriterionofseismicdesignofbuildingstructuresistojudgetheactualstructureunderearthquakeaction

Aneffectivewaytotaketime.Inthispaper,thecalculationmethodandtheyielddiscriminantprincipleareproposedtofindtheweakpartofthestructure

Themeasuresaretakentoensurethatthestructuremeetsthespecificationof"smallearthquakesandnotbad,andtheearthquakecanberepaired",thusprovidingfortheearthquakeresistancetargetsof"bigshock"

Quantitativecalculationmethod.Inthispaper,threepracticalengineeringcasesofdifferentstructuraltypesareanalyzedbyyielddiscriminantanalysis.

TheAbstract

Thispaperpresentstheyieldpredictionmethodwhichcanfindouttheweakmembertobeconcerned,itsyieldtype

Theyieldmomentofabuildingstructureundercertainintensityofseismicaction

Yieldpredictionprincipleinthispaperprovidethequantifiedmethodtopickuptheweakmembersofthestructure.

Takeenforcementmeasuresandensurethestructuresatisfyingtheanti-seismicfortifytargetof"nodestoryunder"

Minorearthquake,repairableundermiddleearthquake,nocollapseundermajoreartkquake

Stipulatedinthe

Chinadesigncode.Italsopresentscalculationresultsof3practicaltallbuildingstructurestoshowtheapplication

Ofthemethod.

[keywords]

Buildingstructure,earthquakeaction,yieldtest,weakspot

TheKeyWords

Buildingstructure,SeismicAction,Yieldpredictionmethod,

Weakmember

One,theintroduction

China'searlybuildingseismicdesignstandard

[1],whichbasicallyadoptedthepracticeofforeignregulationsatthattime,wasappliedtoelasticearthquake

Structuralcoefficient

AfterthereductionofC,onlythestrengthcheckingandconstructionmeasuresareadoptedtomeetthestructuralductility.Inourcountry

1976

Thetangshanearthquakecausedthewholecityoftangshantobeflattenedinaninstant,andthecasualtieswereextremelyheavy,soitwasprepared

1989constructionresistance

Earthquakedesignspecificationgbj10-89[2],proposedtheaseismicfortificationgoalof"smallshocknotbad,mediumshockcanberepaired,bigshockwon'tfail",

Inthispaper,thedeformationcalculationmethodofbuildingstructureisputforward,thedesignmethodofanti-torsionstructureisdesigned,anditisrequiredtoadoptdifferentseismicgrade

Thecorrespondingstructuralmeasureshavealsobeenproposedforsomeimportantbuildings.

Theelastic-plasticdeformationisanalyzedandchecked.

Itplayedamajorroleinpreventingstructuralcollapse.Thenewbuildingin2002

Structuralseismicdesignspecification（gb50010-2002）[3]isstilladopted

Thesameaseismicfortificationtargetsarethesame,buttwoarebuilt

Therearetwoproblemsinseismicdesigncalculationofseismicdesignspecification:

1.Nospecialdesignrulesaremadefortheanalysisofweakcomponentsinthestructureoftheearthquake,butonlyfortheframework

Theweaklayersofthetypeshearstructureareprovidedwithsomerules.Thisisfarfrommeetingthedesignpracticerequirements.Sometimes,let

Easytobringabouttheconfusionofconcepts.

2.Undertheinfluenceoftheearthquake,thespecificationonlyprovidestheconceptualrequirementsof"mid-earthquakerepair",butnot

Therearespecificrulesforthedesignofaseismicdesign,whichisbeyondtheprobability

Anearthquakeof10%isclearlynotenough.

Fortheabovementionedabove,thispaperputsforwardthe"yielddiscriminationmethod"ofbuildingseismicdesigntodeterminewhetherthecomponenthasyieldedornot

Yieldandwhatkindofyield,asthebasisforexaminingandmasteringtheactualseismiccapacityofthedesignedstructure,canbefound

Thepositionoftheweakestmemberofthestructureanditsyieldpropertyandthesizeoftheearthquakeactioninthecaseofyieldarepresented

1

Inordertocomplywiththedesignprinciplesofaseismaticdesign,suchastheprematureyieldofthecomponent,itshouldbestrengthenedappropriatelyanddelayedtheappearanceofyield,whichistoprevent

Thestructureofthestructureundertheinfluenceoftheearthquakeisbeneficial,whilenotallowingthebrittlefailureoftheshearyieldorthesafetyofthestructuralsafety

Thefailureoftensileorpressurebendingcanbetterguarantee

theseismicsafetyofthestructureandmeettheaseismatictargets

O.Inthispaper,itissuggestedthatthemainstresscomponents,suchasverticalcomponents,shouldnotbeallowedtoyield

Inthecaseofbeamorothersecondarycomponentsthatcanbeusedforenergyconsumption,aminoryieldcanbeallowed,suchadesignparty

Themethodcanbetterreflecttherequirementof"mediumearthquakerepair"throughproperquantitativecalculationmethod,whichcanbequake-resistanttoearthquakeswithsmallearthquakesandrareearthquakes

Combiningwiththedesignrules,itcanbetterachievethetargetofseismicfortificationof"smallshock,mediumshock,andshock".

Thestructureofmanycomponentsundertheactionoftheearthquakehasenteredintoyield,anditscalculationneedstobetakenintoconsiderationoftheanalyticalmethodofstructuralelastoplastic

Law,althoughfromtheUnitedStates

Professorr.c.loughpublishedthefirstpaperontheanalysisofelastoplasticseismicresponseintheshearstructure.

Hasgonethrough

Morethan40yearsofresearch,butthedynamicelastic-plasticanalysismethodisstillnotmatureenough,eventhestaticelastic-plasticanalysis

Methods（push-backanalysismethod）arerelativelymatureandpracticalinrelativedevelopment

[4],butthecomputationalworkloadisstillheavyandtechnicaldifficult

Thedegreeisalsolarger,soitisstilldifficulttopromotetheapplicationinpractice.Buttheyielddiscriminantruleproposedinthispaperistoseekthemost

Thestructureoftheweakcomponentisstillinelasticstateingeneral,sothecalculationofthislawunderearthquakecanbeapproximated

Usingthesameelasticcalculationmethodasthesmallshock,thismethodhasprovidedtheconveniencefortheapplicationofengineeringinengineering.

Ii.Weaklayerandweakmember

AnupperpartofOliveHospitalwasintheSanfernadoearthquakein1972

Themulti-storeybuildingofthelowerframeoftheshearwalliscausedbythelackofflexuralstrengthofthebottomreinforcedconcretecolumn

Localcollapse.

soon

Thestructureofathree-storyreinforcedconcreteframestructureintianjinisduetoastrongaftershockofthe1976tangshanearthquake

Thesecondlayerreinforcedconcretecolumnisbentinbendingyieldandthewholestructurecollapses.Thesecondlayerisbentbecauseofplasticdeformation

Sform.

Thesetwofamouscases,whichcollapsedintheearthquake,havemadestructuralengineersawareofthedangersofweaklayersinthestructure

Sexshouldbetakenintheseismicdesignofstructurestoprevent.

Subsequently,thesingle-layerstructure,multi-layerframestructureandmulti-layershearstructureareanalyzedandstudied

Oncetheweaklayerisundertheinfluenceoftheearthquake,itmayresultinalargeplasticdeformationconcentrationintheweaklayer,resultinginthejunction

Thestructuralcollapseof[5][6],oneofthefloorsintothe

yieldsignistheearthquakeactionofthefloorshearforcehasexceededthefloor'sshearyield

Strength.Foramultilayerframestructure,theformulacanbeexpressedasfollows

Vyi

（1）

Yjiyji

Vyi=.

j

Vyji=.

j

MTh

+

iMB

（2）

Intheformula,theVeiistheelasticseismicshearforceundertheactionofthehorizontalearthquake;Vyiforfloor

AllthecolumnsofIformedwhenbendingthebend

Shearbearingcapacity,

T,

B,respectively

Iinthefirstlayer

Jcolumnupperandlowerbendyieldstrength.

MyjiMyji

Theaboveformulacanstillbeusedformulti-layershearwallstructure,but

TheshearbearingcapacityoftheIlayerwallcanberoot

Accordingtotheformulaofshearwallshearbearingcapacityof[7]in[7]ofhighrisebuildingconcretestructure（jgj3-2002）,theformulaofshearwallshearbearingcapacityisdetermined.

Thus,itcanbeseenthattheminimumvalueoftheshearratioisthedefinitionoftheweaklayer

（Vyk/Vek）min

2

Definetheweaklayer

ThepositionofIisexpressedasfollows:

Vyi/Vei<（Vyk/Vek）k=1...AndI-1,I+1,...Nof3

Theoreticalstudiesshowthatevenashear-typemulti-layerframeisnotaweaklayerundertheactionofhorizontalearthquake

Thecolumnorverticalcomponententersintosubmissionatthesameinstant;Instead,itisarootorsomeoftheweakestpillarsthatgiveintotheearthquakeandcontinuetofunction.

Theothercolumnscausedthefloortocollapseasaresult.Furtheranalysisshowsthattheshearwallisbent

Theshearwallitselfmaybeaffectedbythedifferenceoftheforceandthestructureofthereinforcement

Bendyieldorshearyield,underthedesignprincipleofstrongshearweakbend,whenacertainshearwallfirstappearsbentyield,thenin

Whentheearthquakeactioncontinuestoincrease,othercomponentswillgraduallyyieldtoeachother,anddifferentstructureshavetheirownuniqueyielddevelopmentandplasticities

Thelawofredistributionofsexualinternalforcedoesnotnecessarilyresultinth