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单层网壳结构的阻尼减振控制分析.docx

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单层网壳结构的阻尼减振控制分析 Abstract Inrecentyears,single-layershellstructureshavebeenwidelyusedinconstructionduetotheirvariousadvantagessuchaslightweight,highstrengthandbeautifulappearance.However,thedynamicresponseofsingle-layershellstructuresunderexternalexcitation,suchasearthquake,windandtraffic,isamajorconcernforthestructuralsafetyofthesestructures.Thedampingcontrolofsingle-layershellstructuresisaneffectivewaytoreducethedynamicresponseandimprovethesafety.Inthispaper,thedampingcontrolmethodsforsingle-layershellstructuresarediscussedandevaluated. Introduction Single-layershellstructures,asatypeoflightweightandefficientstructuralsystem,havebeenwidelyusedinvariousapplicationssuchasgymnasiums,exhibitionhalls,airportsandmuseums.Duetotheirthinandcurvedforms,shellstructureshaveuniquemechanicalpropertiessuchaslargedeformationcapacity,highstrength-to-weightratioandexcellentaestheticappeal.Nevertheless,thedynamicresponseofshellstructuresunderexternalexcitationssuchasearthquake,windandtrafficisacriticalissuefortheirsafetyandserviceability.Thedynamicresponseofshellstructurescanleadtoexcessivedeformation,stressconcentration,andevencollapse,whichhavebeenobservedinseveralshellstructuresworldwide.Therefore,itisnecessarytoinvestigatethedynamicresponseofshellstructuresanddevelopappropriatedampingcontrolstrategiestomitigatethestructuralvibration. DampingControlMethodsforSingle-layerShellStructures PassiveDampingControlMethod Passivedampingcontrolisatechniquethataltersthevibrationcharacteristicsofthestructurebyaddingdampingdevicesormaterialstothestructurewithoutrequiringanexternalenergysource.Passivedampingdevicescanbeclassifiedintotwocategories:viscousdampingdevicesandtunedmassdamping(TMD)devices. ViscousDampingDevices Viscousdampingdevicessuchasdampersandviscoelasticmaterialsarecommonlyusedtoreducethevibrationofsingle-layershellstructures.Dampersaretypicallyinstalledatstrategiclocationsinthestructuretoabsorbtheexcessenergyofthestructureduringvibration.Viscoelasticmaterialsareattachedtotheshe