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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INFLUENCEOFISOLATORCHARACTERISTICSONTHERESPONSEOFBASEISOLATEDSTRUCTUREVASANTAMATSAAR1ZSJANIDSABSTRACTTHEINFLUENCEOFISOLATORCHARACTERISTICSONTHESEISMICRESPONSEOFMULTISTORYBASEISOLATEDSTRUCTUREISINVESTIGATEDTHEISOLATEDBUILDINGISMODELEDASASHEARTYPESTRUCTUREWITHLATERALDEGREEOFFREEDOMATEACHFLOORTHEISOLATORSAREMODELEDBYUSINGTWODIFFERENTMATHEMATICALMODELSDEPICTEDBYBILINEARHYSTERETICANDEQUIVALENTLINEARELASTICVISCOUSBEHAVIORSTHECOUPLEDDIFFERENTIALEQUATIONSOFMOTIONFORTHEISOLATEDSYSTEMAREDERIVEDANDSOLVEDINTHEINCREMENTALFORMUSINGNEWMARKSSTEPBYSTEPMETHODOFINTEGRATIONTHEVARIATIONOFTOPFLOORABSOLUTEACCELERATIONANDHEARINGDISPLACEMENTFORVARIOUSBILINEARSYSTEMSUNDERDIFFERENTEARTHQUAKESISCOMPUTEDTOSTUDYTHEEFFECTSOFTHESHAPEOFTHEISOLATORHYSTERESISLOOPTHEINFLUENCEOFTHESHAPEOFISOLATORFORCEDEFORMATIONLOOPONTHERESPONSEOFISOLATEDSTRUCTUREISSTUDIEDUNDERTHEVARIATIONOFIMPORTANTSYSTEMPARAMETERSSUCHASISOLATORYIELDDISPLACEMENT,SUPERSTRUCTUREFLEXIBILITY,ISOLATIONTIMEPERIODANDNUMBEROFSTORYOFTHEBASEISOLATEDSTRUCTUREITISOBSERVEDTHATTHECODESPECIFIEDEQUIVALENTLINEARELASTICVISCOUSDAMPINGMODELOFABILINEARHYSTERETICSYSTEMOVERESTIMATESTHEDESIGNBEARINGDISPLACEMENTANDUNDERESTIMATESTHESUPERSTRUCTUREACCELERATIONTHERESPONSEOFBASEISOLATEDSTRUCTUREISSIGNIFICANTLYINFLUENCEDBYTHESHAPEOFHYSTERESISLOOPOFISOLATORTHELOWVALUEOFYIELDDISPLACEMENTOFISOLATORIESLIDINGTYPEISOLATIONSYSTEMSTENDSTOINCREASETHESUPERSTRUCTUREACCELERATIONSASSOCIATEDWITHHIGHFREQUENCIESFURTHER,THESUPERSTRUCTUREACCELERATIONALSOINCREASESWITHTHEINCREASEOFTHESUPERSTRUCTUREFLEXIBILITYKEYWORDSBASEISOLATION;EARTHQUAKE;ELASTOMTRICBEARINGSLIDINGSYSTEM;BEARINGDISPLACEMENT;SUPERSTRUCTUREACCELERATION;BILINEARHYSTERESIS;EQUIVALENTLINEAR1INTRODUCTIONSEISMICISOLATION,WHICHISNOWRECOGNIZEDASAMATUREANDEFFICIENT北京交通大学毕业设计(论文)外文翻译第2页TECHNOLOGY,CANBEADOPTEDTOIMPROVETHESEISMICPERFORMANCEOFSTRATEGICALLYIMPORTANTBUILDINGSSUCHASSCHOOLS,HOSPITALS,INDUSTRIALSTRUCTURESETC,INADDITIONTOTHEPLACESWHERESENSITIVEEQUIPMENTSAREINTENDEDTOPROTECTFROMHAZARDOUSEFFECTSDURINGEARTHQUAKE13BASEDONTHEEXTENTOFCONTROLTOBEACHIEVEDOVERTHESEISMICRESPONSE,THECHOICEOFTHEISOLATIONSYSTEMVARIESANDTHEREUPONITSDESIGNISDONETOSUITTHEREQUIREMENTSOFUSEOFTHESTRUCTUREINSEISMICALLYBASEISOLATEDSYSTEMS,THESUPERSTRUCTUREISDECOUPLEDFROMTHEEARTHQUAKEGROUNDMOTIONBYINTRODUCINGAFLEXIBLEINTERFACEBETWEENTHEFOUNDATIONANDTHEBASEOFSTRUCTURETHEREBY,THEISOLATIONSYSTEMSHIFTSTHEFUNDAMENTALTIMEPERIODOFTHESTRUCTURETOALARGEVALUEAND/ORDISSIPATESTHEENERGYINDAMPING,LIMITINGTHEAMOUNTOFFORCETHATCANBETRANSFERREDTOTHESUPERSTRUCTURESUCHTHATINTERSTORYDRIFTANDFLOORACCELERATIONSAREREDUCEDDRASTICALLYTHEMATCHINGOFFUNDAMENTALFREQUENCIESOFBASEISOLATEDSTRUCTURESANDTHEPREDOMINANTFREQUENCYCONTENTSOFEARTHQUAKESISALSOCONSEQUENTLYAVOIDED,LEADINGTOAFLEXIBLESTRUCTURALSYSTEMMORESUITABLEFROMEARTHQUAKERESISTANCEVIEWPOINTTHETWOMOSTCOMMONTYPESOFBASEISOLATIONSYSTEMSADOPTEDINPRACTICEUTILIZEEITHERRUBBERBEARINGSORSLIDINGSYSTEMSBETWEENTHEFOUNDATIONANDSUPERSTRUCTUREFORTHEPURPOSEOFISOLATIONFROMGROUNDMOTIONSINTHEBUILDINGSASWELLASBRIDGESITISVERYESSENTIALTOUNDERSTANDTHEDIFFERENTPARAMETERSAFFECTINGTHERESPONSEOFBASEISOLATEDSTRUCTUREWHENUSEDFORSEISMICPROTECTIONOFTHESTRUCTURESESPECIALLYINCASEOFTHEBASEISOLATEDSTRUCTURES,THATHOUSESSENSITIVEEQUIPMENTS,DETERMINATIONOFACCELERATIONIMPARTEDANDASSOCIATEDPEAKDISPLACEMENTARETHEKEYISSUESFORTHEDESIGNENGINEER4MOREOVER,THEPOUNDINGANDSTRUCTURALIMPACTSINCASEOFBASEISOLATEDSTRUCTURESMADEUPONTHEADJACENTSTRUCTURES,WHENSEPARATIONGAPDISTANCESAREINADEQUATE,BECOMEAMAJORCONCERNBECAUSETHESEPHENOMENAMAYLEADTOCATASTROPHICFAILURESLEADINGTOIMMENSEISOLATORDAMAGESUCHFAILURESANDDAMAGESCANBEAVOIDEDBYPROPERLYESTIMATINGTHEPEAKISOLATORDISPLACEMENTANDRECOMMENDATIONOFAPPROPRIATEISOLATIONGAPDISTANCESINORDERTOPREDICTPEAKDISPLACEMENTANDDETERMINEACCURATESEPARATIONGAPDISTANCEREQUIREMENTFORABASEISOLATEDSTRUCTURE,ITISMANDATORYTOKNOW,INPRIOR,THEDIFFERENTPARAMETERSTHATAFFECTTHEBEARINGDISPLACEMENTANDITSCONSEQUENTEFFECTONTHESUPERSTRUCTUREACCELERATIONTHEFAILURESDUETOSUCHIMPACTSCANBEAVOIDEDBYREDUCINGTHEPEAKBEARINGDISPLACEMENTBYCOMPROMISINGWITHINCREASEIN北京交通大学毕业设计(论文)外文翻译第3页SUPERSTRUCTUREACCELERATIONTOANACCEPTABLELEVELIETOLERABLEREDUCTIONINEFFECTIVENESSOFISOLATIONSELECTIONOFDIFFERENTPARAMETERSCHARACTERIZINGANISOLATIONSYSTEMISIMPORTANTINVIEWOFKEEPINGACONTROLOVERRESPONSEQUANTITIESESPECIALLYTHEEXCESSIVEBEARINGDISPLACEMENTATISOLATORLEVELTHEBEHAVIOROFISOLATIONSYSTEMSANDTHEBASEISOLATEDSTRUCTURESISNOWWELLESTABLISHEDANDCODESAREDEVELOPEDFORDESIGNINGTHEBASEISOLATEDSTRUCTURES5–9FORNONLINEARISOLATIONSYSTEMS,THECODESALLOWTOUSETHEEQUIVALENTLINEARMODELTOPERMITTHEUSEOFRESPONSESPECTRUMMETHODFORDESIGNINGTHEISOLATEDSTRUCTURESTHEEQUIVALENTLINEARMODELSAREBASEDONTHEEFFECTIVESTIFFNESSATTHEDESIGNDISPLACEMENTANDTHEEQUIVALENTVISCOUSDAMPINGISEVALUATEDFROMTHEAREAOFTHEHYSTERESISLOOPTHECOMPARISONOFEQUIVALENTLINEARANDACTUALNONLINEARMODELFORTHERESPONSEOFISOLATEDBRIDGESTRUCTURESHADBEENDEMONSTRATEDINTHEPAST10–13ANDSHOWNTHATTHEEQUIVALENTLINEARMODELCANBEUSEDFORPREDICTINGTHEACTUALNONLINEARRESPONSEOFTHESYSTEMHOWEVER,THEABOVESTUDIESWERERESTRICTEDTOTHEBRIDGEIDEALIZEDASARIGIDBODYANDTHENONLINEARBEHAVIOROFTHEISOLATORWASLIMITEDTOTHELEAD–RUBBERBEARINGSIDEALIZEDBYBILINEARCHARACTERISTICSTHEEQUIVALENTLINEARMODELMAYGIVEDIFFERENTRESPONSEOFISOLATEDSTRUCTURESINCOMPARISONTOTHEACTUALNONLINEARMODELFORFLEXIBLESUPERSTRUCTURESANDTHETYPEOFNONLINEARHYSTERESISLOOPOFTHEISOLATORASSOCIATEDWITHSLIDINGTYPEISOLATIONSYSTEMSTHEREFORE,ITWILLBEINTERESTINGTOSTUDYTHECOMPARISONOFTHETWOMODELSFORDIFFERENTHYSTERETICBEHAVIOROFTHEISOLATORANDTHESYSTEMPARAMETERSHEREIN,THESEISMICRESPONSEOFMULTISTORYSTRUCTURESUPPORTEDONNONLINEARBASEISOLATIONSYSTEMSISINVESTIGATEDTHESPECIFICOBJECTIVESOFTHESTUDYAREITOCOMPARETHESEISMICRESPONSEOFBASEISOLATEDFLEXIBLEBUILDINGOBTAINEDFROMVARIOUSBILINEARHYSTERETICMODELANDITSEQUIVALENTLINEARMODEL;IITOSTUDYTHEINFLUENCEOFSHAPEOFTHEISOLATORHYSTERESISLOOPANDITSPARAMETERSIEYIELDDISPLACEMENTANDFORCEONTHEEFFECTIVENESSOFTHEISOLATIONSYSTEMANDIIITOINVESTIGATETHEEFFECTSOFSUPERSTRUCTUREFLEXIBILITYONTHERESPONSEOFBASEISOLATEDSTRUCTURES2STRUCTURALMODELOFBASEISOLATEDBUILDINGFIG1ASHOWSTHEIDEALIZEDMATHEMATICALMODELOFTHENSTORYBASEISOLATED北京交通大学毕业设计(论文)外文翻译第4页BUILDINGCONSIDEREDFORTHEPRESENTSTUDYTHEBASEISOLATEDBUILDINGISMODELEDASASHEARTYPESTRUCTUREMOUNTEDONISOLATIONSYSTEMSWITHONELATERALDEGREEOFFREEDOMATEACHFLOORFOLLOWINGASSUMPTIONSAREMADEFORTHESTRUCTURALSYSTEMUNDERCONSIDERATION1THESUPERSTRUCTUREISCONSIDEREDTOREMAINWITHINTHEELASTICLIMITDURINGTHEEARTHQUAKEEXCITATIONTHISISAREASONABLEASSUMPTIONASTHEISOLATIONATTEMPTSTOREDUCETHEEARTHQUAKERESPONSEINSUCHAWAYTHATTHESTRUCTUREREMAINSWITHINTHEELASTICRANGE2THEFLOORSAREASSUMEDRIGIDINITSOWNPLANEANDTHEMASSISSUPPOSEDTOBELUMPEDATEACHFLOORLEVEL3THECOLUMNSAREINEXTENSIBLEANDWEIGHTLESSPROVIDINGTHELATERALSTIFFNESS4THESYSTEMISSUBJECTEDTOSINGLEHORIZONTALCOMPONENTOFTHEEARTHQUAKEGROUNDMOTION5THEEFFECTSOFSOIL–STRUCTUREINTERACTIONARENOTTAKENINTOCONSIDERATIONFORTHESYSTEMUNDERCONSIDERATION,THEGOVERNINGEQUATIONSOFMOTIONAREOBTAINEDBYCONSIDERINGTHEEQUILIBRIUMOFFORCESATTHELOCATIONOFEACHDEGREESOFFREEDOMTHEEQUATIONSOFMOTIONFORTHESUPERSTRUCTUREUNDEREARTHQUAKEGROUNDACCELERATIONAREEXPRESSEDINTHEMATRIXFORMASWHEREMS,CSANDKSARETHEMASS,DAMPINGANDSTIFFNESSMATRICESOFTHESUPERSTRUCTURE,RESPECTIVELY;12,,,TSNSSANDXXXXXX。。ARETHEUNKNOWNRELATIVEFLOORDISPLACEMENT,VELOCITYANDACCELERATIONVECTORS,RESPECTIVELY;。。XBAND。。XGARETHERELATIVEACCELERATIONOFBASEMASSANDEARTHQUAKEGROUNDACCELERATION,RESPECTIVELY;AND{R}ISTHEVECTOROFINFLUENCECOEFFICIENTSTHECORRESPONDINGEQUATIONOFMOTIONFORTHEBASEMASSUNDEREARTHQUAKEGROUNDACCELERATIONISEXPRESSEDBYWHEREMBANDFBARETHEBASEMASSANDRESTORINGFORCEDEVELOPEDINTHEISOLATIONSYSTEM,RESPECTIVELY;K1ISTHESTORYSTIFFNESSOFFIRSTFLOOR;ANDC1ISTHEFIRSTSTORYDAMPINGTHERESTORINGFORCEDEVELOPEDINTHEISOLATIONSYSTEM,

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