外包钢套法加固震损钢筋混凝土框架抗震性能试验研究
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殷杰1，朱春明1，龚治国1，张富文2(1 上海市建筑科学研究院(集团)有限公司， 上海 200032；2 上海市工程结构新技术重点实验室，上海 200032)［摘要］为研究已震损及未损钢筋混凝土框架采用外包钢套加固后的抗震性能，按照1/2缩尺制作了4榀两层双跨钢筋混凝土框架模型，其中1榀为原型对比框架，1榀直接加固，另外2榀进行不同程度的震损后采用外包钢套法进行加固，最后对所有框架模型进行拟静力试验。试验结果表明，对震损及未损钢筋混凝土框架采用外包钢套法进行合理、可靠加固后，框架结构的承载力有较大程度的提高，并具有良好的塑性变形和耗能能力，震损程度对加固框架的刚度、强度退化以及耗能能力未产生明显影响。从承载力、延性、耗能及对震损的加固修复等方面来看，采用外包钢套加固混凝土框架结构是一种非常有效的抗震加固方法。［关键词］外包钢套； 震损； 混凝土框架； 抗震性能； 加固中图分类号：TU352文献标识码：A文章编号：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*国家科技支撑计划子课题(2009BAJ28B02)，上海市建筑科学研究院科研创新基金项目(HT0208041D000)。作者简介：殷杰，博士，高级工程师，Email：yinjie76@sina.com。参考文献［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，陆洲导，张克纯. 震损钢筋混凝土框架节点修复后抗震性能试验研究［J］. 建筑结构学报，2010,31(12)：6473.［4］陆洲导，刘长青，张克纯，等. 外包钢套法加固钢筋混凝土框架节点试验研究［J］.四川大学学报：工程科学版，2010，42(3)：5662.［5］王新玲，范建伟，姚章堂，等. 损伤程度对碳纤维布加固混凝土框架结构抗震性能影响的研究［J］. 建筑结构，2011，41(6)：9497.［6］GB 50152—92 混凝土结构试验方法标准［S］. 北京：中国建筑工业出版社，1992.
［7］JGJ 101—96 建筑抗震试验方法规程［S］. 北京：中国建筑工业出版社，1997.
