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1、第31卷第3期結(jié)構(gòu)工程師Vo1.31.No.32015年6月StructuralEngineersJun.2015鋼筋混凝土框架結(jié)構(gòu)地震易損性分析蔣歡軍,’劉小娟'薄俊晶,(1.同濟(jì)大學(xué)土木工程防災(zāi)國家重點(diǎn)實(shí)驗(yàn)室,上海200092;2.同濟(jì)大學(xué)結(jié)構(gòu)工程與防災(zāi)研究所,上海200092)摘要為評估按我國現(xiàn)行規(guī)范設(shè)計(jì)的鋼筋混凝土框架結(jié)構(gòu)的地震易損性,將鋼筋混凝土框架結(jié)構(gòu)的抗震性能劃分為四個(gè)等級,采用構(gòu)件端部的塑性轉(zhuǎn)角和結(jié)構(gòu)層間位移角作為性能指標(biāo)分別從構(gòu)件層次和樓層層次對抗震性能等級進(jìn)行量化??紤]地震動的隨機(jī)性和結(jié)構(gòu)材料強(qiáng)度的隨機(jī)性,對285600個(gè)結(jié)構(gòu)——地震動隨機(jī)樣本進(jìn)行彈塑
2、性動力時(shí)程分析,形成易損性曲線,研究設(shè)防烈度、結(jié)構(gòu)高度、場地類別等因素對鋼筋混凝土框架結(jié)構(gòu)地震易損性的影響。結(jié)果表明,層數(shù)越多,場地特征周期越長,結(jié)構(gòu)在各性能水平的超越概率越大。最后,根據(jù)易損性分析結(jié)果,對多水準(zhǔn)的抗震性能目標(biāo)進(jìn)行了分析,為基于性能的抗震設(shè)計(jì)提供參考。關(guān)鍵詞鋼筋混凝土框架結(jié)構(gòu),地震易損性分析,塑性轉(zhuǎn)角,層間位移角SeismicFragilityAnalysisofRCMoment-ResistingFramesJIANGHuanjun’'LIUXia~uan·BOJunjing·(1.StateKeyLaboratoryofDisasterReductio
3、ninCivilEngineering,Ton~iUniversity,Shanghai200092,China;2.ResearchInstituteofStructuralEngineeringandDisasterReduction,Ton~iUniversity,Shanghai200092,China)AbstractSeismicfragilitywasaccessedforRCmoment—resistingframesdesignedaccordingtocurrentChineseseismicdesigncodeforbuildings,basedon
4、fourperformancelevelsproposedinthispaper.Theplasticrotationangleattheendsofstructuralcomponentsandthemaximuminter.storydriftratio,whichreflectsthedamagestatesofthestructurefromtheviewpointofthestructuralcomponentlevelandthestorylevelrespectively,wereemployedasperformanceindexes.Takinginto
5、accounttheuncertaintyofearthquakegroundmotionsandstructuralmaterialstrength,285600numericalsimulationsoftimehistoryanalysisforreferencestructureswereconductedwiththeaidofPERFORM一3Dcomputerprogram.Seismicfragilitycurveswerederivedconsideringthemainvariablessuchastheseismicprotectionintensi
6、ty,thenumberofstoriesandthesitesoiltype.Itisindicatedthattheprobabilityexceedingeachperformanceleveltendstobelargerforstructureswithlargernumberofstoriesandlongercharacteristicperiodofsitesoil.Accordingtotheseismicfragilityanalysisresults,themultipleperformanceobjectiveswerecheckedforRCmo
7、ment-resistingframes,whichprovidereferencesforperformance—basedseismicdesign.KeywordsRCmoment-resistingframes,seismicfragilityanalysis,plasticrotation,inter—storydriftratio投入的增加,地震災(zāi)害呈現(xiàn)新的特點(diǎn),即人員傷亡引數(shù)目得到比較有效的控制,但是經(jīng)濟(jì)損失卻急劇增長,這使得地震風(fēng)險(xiǎn)分析越來越得到重視。地近20年來,隨著建筑技術(shù)的發(fā)展和建筑經(jīng)濟(jì)震易損性分析(se