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外文翻译--减震器对底部隔震结构抗震反应的作用.doc

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外文翻译--减震器对底部隔震结构抗震反应的作用.doc

北京交通大学毕业设计(论文)外文翻译第1页InfluenceofisolatorcharacteristicsontheresponseofbaseisolatedstructureVasantA.Matsaar1Z.S.JanidsAbstractTheinfluenceofisolatorcharacteristicsontheseismicresponseofmultistorybaseisolatedstructureisinvestigated.Theisolatedbuildingismodeledasasheartypestructurewithlateraldegreeoffreedomateachfloor.Theisolatorsaremodeledbyusingtwodifferentmathematicalmodelsdepictedbybilinearhystereticandequivalentlinearelasticviscousbehaviors.ThecoupleddifferentialequationsofmotionfortheisolatedsystemarederivedandsolvedintheincrementalformusingNewmarksstepbystepmethodofintegration.Thevariationoftopfloorabsoluteaccelerationandhearingdisplacementforvariousbilinearsystemsunderdifferentearthquakesiscomputedtostudytheeffectsoftheshapeoftheisolatorhysteresisloop.Theinfluenceoftheshapeofisolatorforcedeformationloopontheresponseofisolatedstructureisstudiedunderthevariationofimportantsystemparameterssuchasisolatoryielddisplacement,superstructureflexibility,isolationtimeperiodandnumberofstoryofthebaseisolatedstructure.Itisobservedthatthecodespecifiedequivalentlinearelasticviscousdampingmodelofabilinearhystereticsystemoverestimatesthedesignbearingdisplacementandunderestimatesthesuperstructureacceleration.Theresponseofbaseisolatedstructureissignificantlyinfluencedbytheshapeofhysteresisloopofisolator.Thelowvalueofyielddisplacementofisolatori.e.slidingtypeisolationsystemstendstoincreasethesuperstructureaccelerationsassociatedwithhighfrequencies.Further,thesuperstructureaccelerationalsoincreaseswiththeincreaseofthesuperstructureflexibility.keywordsBaseisolationEarthquakeElastomtricbearingSlidingsystemBearingdisplacementSuperstructureaccelerationBilinearhysteresisEquivalentlinear.1IntroductionSeismicisolation,whichisnowrecognizedasamatureandefficient北京交通大学毕业设计(论文)外文翻译第2页technology,canbeadoptedtoimprovetheseismicperformanceofstrategicallyimportantbuildingssuchasschools,hospitals,industrialstructuresetc.,inadditiontotheplaceswheresensitiveequipmentsareintendedtoprotectfromhazardouseffectsduringearthquake13.Basedontheextentofcontroltobeachievedovertheseismicresponse,thechoiceoftheisolationsystemvariesandthereuponitsdesignisdonetosuittherequirementsofuseofthestructure.Inseismicallybaseisolatedsystems,thesuperstructureisdecoupledfromtheearthquakegroundmotionbyintroducingaflexibleinterfacebetweenthefoundationandthebaseofstructure.Thereby,theisolationsystemshiftsthefundamentaltimeperiodofthestructuretoalargevalueand/ordissipatestheenergyindamping,limitingtheamountofforcethatcanbetransferredtothesuperstructuresuchthatinterstorydriftandflooraccelerationsarereduceddrastically.Thematchingoffundamentalfrequenciesofbaseisolatedstructuresandthepredominantfrequencycontentsofearthquakesisalsoconsequentlyavoided,leadingtoaflexiblestructuralsystemmoresuitablefromearthquakeresistanceviewpoint.Thetwomostcommontypesofbaseisolationsystemsadoptedinpracticeutilizeeitherrubberbearingsorslidingsystemsbetweenthefoundationandsuperstructureforthepurposeofisolationfromgroundmotionsinthebuildingsaswellasbridges.Itisveryessentialtounderstandthedifferentparametersaffectingtheresponseofbaseisolatedstructurewhenusedforseismicprotectionofthestructures.Especiallyincaseofthebaseisolatedstructures,thathousessensitiveequipments,determinationofaccelerationimpartedandassociatedpeakdisplacementarethekeyissuesforthedesignengineer4.Moreover,thepoundingandstructuralimpactsincaseofbaseisolatedstructuresmadeupontheadjacentstructures,whenseparationgapdistancesareinadequate,becomeamajorconcernbecausethesephenomenamayleadtocatastrophicfailuresleadingtoimmenseisolatordamage.Suchfailuresanddamagescanbeavoidedbyproperlyestimatingthepeakisolatordisplacementandrecommendationofappropriateisolationgapdistances.Inordertopredictpeakdisplacementanddetermineaccurateseparationgapdistancerequirementforabaseisolatedstructure,itismandatorytoknow,inprior,thedifferentparametersthataffectthebearingdisplacementanditsconsequenteffectonthesuperstructureacceleration.Thefailuresduetosuchimpactscanbeavoidedbyreducingthepeakbearingdisplacementbycompromisingwithincreasein北京交通大学毕业设计(论文)外文翻译第3页superstructureaccelerationtoanacceptableleveli.e.tolerablereductionineffectivenessofisolation.Selectionofdifferentparameterscharacterizinganisolationsystemisimportantinviewofkeepingacontroloverresponsequantitiesespeciallytheexcessivebearingdisplacementatisolatorlevel.Thebehaviorofisolationsystemsandthebaseisolatedstructuresisnowwellestablishedandcodesaredevelopedfordesigningthebaseisolatedstructures5–9.Fornonlinearisolationsystems,thecodesallowtousetheequivalentlinearmodeltopermittheuseofresponsespectrummethodfordesigningtheisolatedstructures.Theequivalentlinearmodelsarebasedontheeffectivestiffnessatthedesigndisplacementandtheequivalentviscousdampingisevaluatedfromtheareaofthehysteresisloop.Thecomparisonofequivalentlinearandactualnonlinearmodelfortheresponseofisolatedbridgestructureshadbeendemonstratedinthepast10–13andshownthattheequivalentlinearmodelcanbeusedforpredictingtheactualnonlinearresponseofthesystem.However,theabovestudieswererestrictedtothebridgeidealizedasarigidbodyandthenonlinearbehavioroftheisolatorwaslimitedtothelead–rubberbearingsidealizedbybilinearcharacteristics.Theequivalentlinearmodelmaygivedifferentresponseofisolatedstructuresincomparisontotheactualnonlinearmodelforflexiblesuperstructuresandthetypeofnonlinearhysteresisloopoftheisolatorassociatedwithslidingtypeisolationsystems.Therefore,itwillbeinterestingtostudythecomparisonofthetwomodelsfordifferenthystereticbehavioroftheisolatorandthesystemparameters.Herein,theseismicresponseofmultistorystructuresupportedonnonlinearbaseisolationsystemsisinvestigated.Thespecificobjectivesofthestudyareitocomparetheseismicresponseofbaseisolatedflexiblebuildingobtainedfromvariousbilinearhystereticmodelanditsequivalentlinearmodeliitostudytheinfluenceofshapeoftheisolatorhysteresisloopanditsparametersi.e.yielddisplacementandforceontheeffectivenessoftheisolationsystemandiiitoinvestigatetheeffectsofsuperstructureflexibilityontheresponseofbaseisolatedstructures.2.StructuralmodelofbaseisolatedbuildingFig.1ashowstheidealizedmathematicalmodeloftheNstorybaseisolated北京交通大学毕业设计(论文)外文翻译第4页buildingconsideredforthepresentstudy.Thebaseisolatedbuildingismodeledasasheartypestructuremountedonisolationsystemswithonelateraldegreeoffreedomateachfloor.Followingassumptionsaremadeforthestructuralsystemunderconsideration1.Thesuperstructureisconsideredtoremainwithintheelasticlimitduringtheearthquakeexcitation.Thisisareasonableassumptionastheisolationattemptstoreducetheearthquakeresponseinsuchawaythatthestructureremainswithintheelasticrange.2.Thefloorsareassumedrigidinitsownplaneandthemassissupposedtobelumpedateachfloorlevel.3.Thecolumnsareinextensibleandweightlessprovidingthelateralstiffness.4.Thesystemissubjectedtosinglehorizontalcomponentoftheearthquakegroundmotion.5.Theeffectsofsoil–structureinteractionarenottakenintoconsideration.Forthesystemunderconsideration,thegoverningequationsofmotionareobtainedbyconsideringtheequilibriumofforcesatthelocationofeachdegreesoffreedom.TheequationsofmotionforthesuperstructureunderearthquakegroundaccelerationareexpressedinthematrixformaswhereMs,CsandKsarethemass,dampingandstiffnessmatricesofthesuperstructure,respectively.12,,.....,TsNssandxxxxxx。。aretheunknownrelativefloordisplacement,velocityandaccelerationvectors,respectively。。xband。。xgaretherelativeaccelerationofbasemassandearthquakegroundacceleration,respectivelyand{r}isthevectorofinfluencecoefficients.ThecorrespondingequationofmotionforthebasemassunderearthquakegroundaccelerationisexpressedbywherembandFbarethebasemassandrestoringforcedevelopedintheisolationsystem,respectivelyk1isthestorystiffnessoffirstfloorandc1isthefirststorydamping.Therestoringforcedevelopedintheisolationsystem,

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