设置粘弹性阻尼器的预应力节段拼装桥墩抗震性能分析-(6166)

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1、哈尔滨工业大学工学硕士学位论文AbstractIncorporatingprecastconcretecomponentsinbridgepiershasthepotentialtoacceleratebridgeconstructionandtoreducethenegativeimpactsthatconstructionoperationshaveontrafficflow.Meanwhile,theunboundedpost-tensioned(PT)precastconcretesegmentalbridge

2、columnsarecapableofundergoinglargelateraldeformationwithnegligibleresidualdrift.Theuseofprecastsegmentalconstructionforbridgepiershasincreasedinthepastcoupleofdecades,butnotinregionsofhighseismicityduetothelimitedenergydissipationcapacityandunknownsregardingtheb

3、ehaviorduringearthquakes.Inthispaper,thetheoreticalandnumericalinvestigationofunboundedpost-tensionedbridgepierswithexternal,fullyreplaceableviscoelastic(VE)dampersaredeveloped,tofurtheradvancethedevelopmentofhigh-performanceseismic-resistantbridgepiers.(1)Visco

4、elastic(VE)dampersareoneofthemostcommonearthquakemitigationdevices.Inthispaper，basedontherequirementofspecificinstallationwithinthebridgepiersandenergydissipationcapacity,anumberofVEdampersaredesignedandfabricatedusingNBR3305viscoelasticmaterials.Themechanicalpr

5、opertiestestsofVEdampersareperformedtodescribeitscomplexcharacteristicschangingwithexcitingfrequencyandstrainamplitude.Inthisstudy,theKelvinmodelisusedtosimulatetheperformanceofVEdampers,whichissimpleandsmallsystemofequation,convenientforlinearandnonlinearsystem

6、s.ComparisonbetweenthenumericalandexperimentalresultsshowsthattheVEdamperscanbemodeledbytheKelvinmodelandthefabricateddampersareeffectiveinreducingtheseismicresponsesofstructures.Meanwhile,thispaperaddressesthemathematicalmodelingofVEdampersconsideringthetransla

7、tionandrotationsimultaneously,andanalyzesthedynamicbehaviorofVEdampersinstalledatthefootofpiers.(2)Thelateralstrengthanddeformationcharacteristicsofunboundedpost-tensionedbridgepierswithexternal,fullyreplaceableviscoelastic(VE)dampersarefirstdevelopedanalyticall

8、y.Elastoplasticstaticanalysisisperformedbasedonthefibermodelandbeam-columnelementtoinvestigatetheresponseofpost-tensionedbridgepier.Thefibermodeladoptsmultiplelinear-