材料阻尼对钢筋及钢管混凝土结构地震响应的影响分析

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1、北京交通大学硕士学位论文材料阻尼对钢筋及钢管混凝土结构地震响应的影响分析姓名：田坤申请学位级别：硕士专业：结构工程指导教师：王元丰20071201拙塞奎适太堂亟主堂篮监銮△曼墨!垦△曼王ABSTRACTABSTRACT：Damping,theparametercharacterizingtheenergydissipationinstructuralvibration，isoneoftheimportantfactorsaffectingthedynamicresponseofstructures．Astherea

2、redifferentmechanismscontributetoenergydissipationintherealstructures，itishardtoobtainalluniformunderstandingaboutdamping．Foranalyzingtherealstructures，thedampingvaluesareusuallyconsideredasconstantsorusingRaylei曲dampinginsteadof．Themethodtocalculatethedamping

3、asaconstantbasedonthematerialusedinthestructureignorestheotherstructurefactorsandisnotreasonable．TheRayleighdampingisonlysetupfordeeouplingincomputationwithoutclearphysicalmeaning．Thecomplexdampingwhichconsiderstheinfluenceofstressandamplitudechangingonenergyd

4、issipationismorereasonableincalculatingthestructuralvibration．Inthispaper,introducingthestressrelatedcomplexdampingmodelintothestructuraldynamicequationandutilizingtheFiniteElementMethod，theresponsesofaReinforcedConcrete(RC)fl-anleandaConcrete-FilledSteelTube(

5、CFST)archbridgesufferedtheE1Centrowave，theTianjinwaveandtheNorthridgewavearecalculated，andthewaytoanalysisthecomplicatedstructurewiththestressrelatedcomplexdampingmodelisrealized．Theresultsindicatethatthepredictionsoftheseismicresponsesbasedonvarydampingmodels

6、aredifferent，andthematerialdampingofstructuresisavariablebasedonthestructuralstress．FortheRCfranle，theresponsesbasedonthestressrelatedcomplexdampingmodelatehi曲erthanthatoftheviscousdampingmodel，andtheamountofthematerialdampinginthestructuraldampingisincreasing

7、withthestructuralstress．FortheCFSTarchbridge，theresponsesbasedonthestressrelatedcomplexdampingmodelarealsohigherthanthatoftheviscousdampingmodel，andtheamountofthematerialdampinginthestructuraldampingisincreasingwiththestructuralstresstoo．Theinfluencesoftheconc

8、retestrengthandthesteelratioontheseismicresponsesoftheCFSTarchbridgearealsoconsidered．KEYWORDS：viscousdamping；complexdamping；lossfactor；reinforcedconcreteframe；concrete-filledsteel