外包鋼套法加固震損鋼筋混凝土框架抗震性能試驗研究
殷杰1，朱春明1，龔治國1，張富文2
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殷杰1，朱春明1，龔治國1，張富文2(1 上海市建筑科學(xué)研究院(集團)有限公司， 上海 200032；2 上海市工程結(jié)構(gòu)新技術(shù)重點實驗室，上海 200032)［摘要］為研究已震損及未損鋼筋混凝土框架采用外包鋼套加固后的抗震性能，按照1/2縮尺制作了4榀兩層雙跨鋼筋混凝土框架模型，其中1榀為原型對比框架，1榀直接加固，另外2榀進行不同程度的震損后采用外包鋼套法進行加固，最后對所有框架模型進行擬靜力試驗。試驗結(jié)果表明，對震損及未損鋼筋混凝土框架采用外包鋼套法進行合理、可靠加固后，框架結(jié)構(gòu)的承載力有較大程度的提高，并具有良好的塑性變形和耗能能力，震損程度對加固框架的剛度、強度退化以及耗能能力未產(chǎn)生明顯影響。從承載力、延性、耗能及對震損的加固修復(fù)等方面來看，采用外包鋼套加固混凝土框架結(jié)構(gòu)是一種非常有效的抗震加固方法。［關(guān)鍵詞］外包鋼套； 震損； 混凝土框架； 抗震性能； 加固中圖分類號：TU352文獻標識碼：A文章編號：1002848X(2013)12006707Experimental study on seismic performance of earthquakedamaged RC framestrengthened by enveloped steelYin Jie1， Zhu Chunming1， Gong Zhiguo1， Zhang Fuwen2(1 Shanghai Research Institute of Building Sciences(Group) Co., Ltd., Shanghai 200032, China;2 Shanghai Key Laboratory of New Technology Research on Engineering Structure, Shanghai 200032, China)Abstract:To study the seismic performance of earthquakedamaged and undamaged RC frame strengthened by enveloped steel, four pieces of twostory and twospan RC frame models with 1/2 scale were designed and produced. One model was original control specimen, one was strengthened by enveloped steel without predamage, and the others were strengthened after predamage. Lowcyclic and repeated load was imposed on all the models until they failed. Results show that reasonably strengthened by enveloped steel, both specimens with and without earthquakedamage have significant improvements on ultimate bearing capacity， and have good ductility and energy dissipation ability. The earthquakedamaged degree has little effect on stiffness degradation, strength degradation and energy dissipation ability. From every aspect such as bearing capacity, ductility, energy dissipation, strengthening effect and so on, RC frame strengthened by enveloped steel is a very effective seismic strengthening method, which can meet the seismic requirements of “no damage under minor earthquakes, repairable under moderate earthquakes, no collapse under severe earthquakes”.Keywords:enveloped steel; earthquakedamaged; RC frame; seismic performance; strengthening*國家科技支撐計劃子課題(2009BAJ28B02)，上海市建筑科學(xué)研究院科研創(chuàng)新基金項目(HT0208041D000)。作者簡介：殷杰，博士，高級工程師，Email：yinjie76@sina.com。參考文獻［1］TANARSLAN H M. Repairing and strengthening of earthquakedamaged RC beams with CFRP strips［J］. Magazine of Concrete Research, 2010, 62(5):365378.［2］VATANIOSKOUEI A. Repairing of seismically damaged RC exterior beamcolumn connection using CFRP［J］. Journal of Reinforced Plastics and Composites, 2010, 29(21):32573274.［3］余江滔，陸洲導(dǎo)，張克純. 震損鋼筋混凝土框架節(jié)點修復(fù)后抗震性能試驗研究［J］. 建筑結(jié)構(gòu)學(xué)報，2010,31(12)：6473.［4］陸洲導(dǎo)，劉長青，張克純，等. 外包鋼套法加固鋼筋混凝土框架節(jié)點試驗研究［J］.四川大學(xué)學(xué)報：工程科學(xué)版，2010，42(3)：5662.［5］王新玲，范建偉，姚章堂，等. 損傷程度對碳纖維布加固混凝土框架結(jié)構(gòu)抗震性能影響的研究［J］. 建筑結(jié)構(gòu)，2011，41(6)：9497.［6］GB 50152—92 混凝土結(jié)構(gòu)試驗方法標準［S］. 北京：中國建筑工業(yè)出版社，1992.
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