偏心隔震結構平-扭耦聯(lián)隨機地震響應分析.pdf

1、蘭州理工大學碩士學位論文偏心隔震結構平扭耦聯(lián)隨機地震響應分析姓名：王文武申請學位級別：碩士專業(yè)：結構工程指導教師：李慧20060501偏心隔震結構平扭耦聯(lián)隨機地震響應分析AbstractDuetothevariousstylesofmodelingandoverallarrangementofbuildingstructures，themasscentreofthestructureandrigiditycentreisalwaysno

2、tcoincident，sothetranslation—torsioncouplingresponsemaybeinducedunderearthquakeexcitationbyreasonofstructuraleccentricitiesTheoryanalysisandseismicdisasterhasshownthattorsionalresponseresultsinrapiddestructionInsomecases

3、，itevenbecomesthemainfactorcausingthestructuralfailure，somanyresearchefshavefocusedincreasingattentionandeffortstothisproblemandsignificantprogresshasbeenmadeinthisfieldWithregardtothispoint，thestudyonstructuralresponseo

4、feccentricbase—isolatedstructureispresentedinthispaperThepar“cleofstructureisregardedastheseries—parallelsystem，andthenonlinearstiffnessoftheisolationlayerisdescribedasthebilinearmodelMatlabsof’twareisadoptedtocompilethe

5、caIculationprogram，throughwhich，responseoftheeccentricstructure，symmetrystructureandeccentricisolatedstructureisanalyzedwiththetime—processmethodseparately，andthenthedynamicresponseofthestructuresmentionedaboVeisundercOm

6、parisonThispaperalsopresentsanequivalentlinearizationmethod，whichisavailableforrandomanalysesandcanbeusedtoobtaintheequivalentstiffnessofisolationbearingBysimulatinggroundaccelerationasfilteringwhitenoiseexc“ationandusin

7、gtheequivalentstiffness，randomanalysisofnon一1ineareccentricisolatedstructureisperformedthroughpseudoexcitationmethodThestatisticcharacteristicofstructuralresponseiscalculatedtocomparewiththatofnonisolatedstructuresTheres

8、ultsofbothtimeprocessandrandomanalysisshowthattheeffectofeccentricitywillreducethedominantperiodandmagnitudethedynamicresponseofthestructureBaseisolationsystemcansuppressthestructuralresponseaswellasthetorsionaleffectofe

9、ccentricisolatedstructureComparedwithsymmetrystructure，seismicmitigationextentofeccentricstructuredescendsslightlyKeywords：Baseisola“on；RaⅡdomrespoⅡse；TranslatioⅡ一torsioⅡcoupling；pseudoexcitatioⅡmethod；Equivalent1neariza