增大截面和碳纤维布包裹复合加固锈蚀钢筋混凝土柱的抗震性能研究
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摘要
试验对不同锈蚀程度的钢筋混凝土柱使用不同的加固方法进行抗震加固,研究碳纤维布包裹与增大混凝土截面复合加固对锈蚀钢筋混凝土柱的抗震性能影响,考虑轴压比、碳纤维布用量、锈蚀量和加固钢筋用量等因素对加固效果的影响,并编制程序对复合加固锈蚀柱的骨架曲线进行数值模拟,对轴压比、碳纤维布用量、锈蚀量和加固钢筋用量对加固效果的影响进行分析。研究表明,碳纤维布包裹与增大混凝土截面复合加固锈蚀钢筋混凝土构件是一种非常有效的方法,能改善试件的延性,提高加固试件的极限承载力和耗能能力,与仅用增大截面加固的试件相比,复合加固试件抗震性能改善非常明显。
An experimental investigation of the seismic resistance behavior of strengthened corroded reinforced concrete (RC) columns with concrete jacket and Carbon Fiber Reinforced Polymer (CFRP) is presented. Cyclic horizontal loading test was carried out with RC columns damaged by different degrees of rebar corrosion and strengthened with different methods under different axial load levels, with variable axial load level, amount of restrengthening bars and CFRP, and degree of corrosion. Based on the stress and strain relationship of RC columns strengthened with concrete jacket and CFRP, a computer code was developed to simulate the skeleton curve of the strengthened columns and the effects of such factors as axial load ratio, amount of restrengthenin bars and CFRP, and degree of corrosion on the strengthening performance were analyzed. Test results indicate that the strengthened reinforced concrete columns with concrete jacket and CFRP is effective, with remarkable improvement in ductility, load-carrying capacity and hysteretic characteristics. Obviously, retrofitting corroded reinforced concrete columns with both concrete jacket and CFRP is more effective than with concrete jacket alone.
An experimental investigation of the seismic resistance behavior of strengthened corroded reinforced concrete (RC) columns with concrete jacket and Carbon Fiber Reinforced Polymer (CFRP) is presented. Cyclic horizontal loading test was carried out with RC columns damaged by different degrees of rebar corrosion and strengthened with different methods under different axial load levels, with variable axial load level, amount of restrengthening bars and CFRP, and degree of corrosion. Based on the stress and strain relationship of RC columns strengthened with concrete jacket and CFRP, a computer code was developed to simulate the skeleton curve of the strengthened columns and the effects of such factors as axial load ratio, amount of restrengthenin bars and CFRP, and degree of corrosion on the strengthening performance were analyzed. Test results indicate that the strengthened reinforced concrete columns with concrete jacket and CFRP is effective, with remarkable improvement in ductility, load-carrying capacity and hysteretic characteristics. Obviously, retrofitting corroded reinforced concrete columns with both concrete jacket and CFRP is more effective than with concrete jacket alone.
引文
[1]贡金鑫,仲伟秋,赵国藩.受腐蚀钢筋混凝土偏心受压构件低周反复性能的试验研究[J].建筑结构学报,2004,25(5):92-104(Gong Jinxin,Zhong Weiqiu,Zhao Guofan.Experimental study on low-cycle behavior of corroded reinforced concrete member under eccentric compression[J].Journal of Building Structures,2004,25(5):92-104(in Chinese))
[2]史庆轩,牛狄涛,颜桂云.反复荷载作用下锈蚀钢筋混凝土压弯构件恢复力性能的试验研究[J].地震工程与工程震动,2000,20(4):44-50(Shi Qingxuan,Niu Ditao,Yan Guiyun.Experimental research on hysteretic characteristics of corroded R C members with flexural and compressive axial loads under repeated horizontal loading[J].Earthquake Engineering and Engineering Vibration,2000,20(4):44-50(in Chinese))
[3]牛荻涛,陈新孝,王学民.锈蚀钢筋混凝土压弯构件抗震性能试验研究[J].建筑结构,2004,34(10):36-38(Niu Ditao,Chen Xinxiao,Wang Xuemin.Experimental study on seismic performance of corroded reinforced concrete members with flexure and compression[J].Building Structure,2004,34(10):36-38(in Chinese))
[4]Belarbi A,Bae S W.An experimental study on the effect of environmental exposures and corrosion on RC columns with FRP composite jackets[J].Composites Part B:Engineering,2007,38(6):674-684
[5]Leea HS,Kageb T,Noguchic T,et al.An experimental study on the retrofitting effects of reinforced concrete columns damaged by rebar corrosion strengthened with carbon fiber sheets[J].Cement and Concrete Research,2003,33(4):563-570
[6]贡金鑫,李金波,赵国藩.受腐蚀钢筋混凝土构件的恢复力模型[J].土木工程学报,2005,38(11):38-44(Gong Jinxin,Li Jinbo,Zhao Guofan.Restoring force model of corroded reinforced concrete elements[J].China Civil Engineering Journal,2005,38(11):38-44(in Chinese))
[7]敬登虎.FRP约束混凝土的应力-应变模型及其在加固中的应用研究[D].南京:东南大学,2006(Jing Denghu.Researches on models of Stress-strain and applications in rehabilitation for concrete confined by FRP[D].Nanjing:Southeast University,2006(in Chinese))
[8]Morettia M,Tassios T P.Behaviour of short columns subjected to cyclic shear displacements:Experimental results[J].Engineering Structures,2007,29(8):2018-2029
[9]Galal K,Arafa A,Ghobarah A.Retrofit of RC square short columns[J].Engineering Structures,2005,27(5):801-813
[10]Parvin A,Wang W.Concrete columns confined by fiber composite wraps under combined axial and cyclic lateral loads[J].Composite Structures,2002,58(4):539-549
[11]JGJ116—98建筑抗震加固技术规程[S].北京:中国建筑工业出版社(JGJ116—98Technical specification for seismic strengthening of building[S].Beijing:China Architecture&Building Press(in Chinese))
[12]卢亦焱,陈少雄,赵国藩.外包钢与碳纤维布复合加固钢筋混凝土柱抗震性能试验研究[J].土木工程学报,2005,38(8):10-17(Lu Yiyan,Chen Shaoxiong,Zhao Guofan.An experimental study on the seismic behavior of reinforced concrete column strengthened with bonded steelhoops and carbon fiber reinforced polymer sheet[J].China Civil Engineering Journal,2005,38(8):10-17(in Chinese))
[13]Vandoros K G,Dritsos S E.Concrete jacket construction detail effectiveness when strengthening RC columns[J].Construction and Building Materials,2008,22(3):264-276
[2]史庆轩,牛狄涛,颜桂云.反复荷载作用下锈蚀钢筋混凝土压弯构件恢复力性能的试验研究[J].地震工程与工程震动,2000,20(4):44-50(Shi Qingxuan,Niu Ditao,Yan Guiyun.Experimental research on hysteretic characteristics of corroded R C members with flexural and compressive axial loads under repeated horizontal loading[J].Earthquake Engineering and Engineering Vibration,2000,20(4):44-50(in Chinese))
[3]牛荻涛,陈新孝,王学民.锈蚀钢筋混凝土压弯构件抗震性能试验研究[J].建筑结构,2004,34(10):36-38(Niu Ditao,Chen Xinxiao,Wang Xuemin.Experimental study on seismic performance of corroded reinforced concrete members with flexure and compression[J].Building Structure,2004,34(10):36-38(in Chinese))
[4]Belarbi A,Bae S W.An experimental study on the effect of environmental exposures and corrosion on RC columns with FRP composite jackets[J].Composites Part B:Engineering,2007,38(6):674-684
[5]Leea HS,Kageb T,Noguchic T,et al.An experimental study on the retrofitting effects of reinforced concrete columns damaged by rebar corrosion strengthened with carbon fiber sheets[J].Cement and Concrete Research,2003,33(4):563-570
[6]贡金鑫,李金波,赵国藩.受腐蚀钢筋混凝土构件的恢复力模型[J].土木工程学报,2005,38(11):38-44(Gong Jinxin,Li Jinbo,Zhao Guofan.Restoring force model of corroded reinforced concrete elements[J].China Civil Engineering Journal,2005,38(11):38-44(in Chinese))
[7]敬登虎.FRP约束混凝土的应力-应变模型及其在加固中的应用研究[D].南京:东南大学,2006(Jing Denghu.Researches on models of Stress-strain and applications in rehabilitation for concrete confined by FRP[D].Nanjing:Southeast University,2006(in Chinese))
[8]Morettia M,Tassios T P.Behaviour of short columns subjected to cyclic shear displacements:Experimental results[J].Engineering Structures,2007,29(8):2018-2029
[9]Galal K,Arafa A,Ghobarah A.Retrofit of RC square short columns[J].Engineering Structures,2005,27(5):801-813
[10]Parvin A,Wang W.Concrete columns confined by fiber composite wraps under combined axial and cyclic lateral loads[J].Composite Structures,2002,58(4):539-549
[11]JGJ116—98建筑抗震加固技术规程[S].北京:中国建筑工业出版社(JGJ116—98Technical specification for seismic strengthening of building[S].Beijing:China Architecture&Building Press(in Chinese))
[12]卢亦焱,陈少雄,赵国藩.外包钢与碳纤维布复合加固钢筋混凝土柱抗震性能试验研究[J].土木工程学报,2005,38(8):10-17(Lu Yiyan,Chen Shaoxiong,Zhao Guofan.An experimental study on the seismic behavior of reinforced concrete column strengthened with bonded steelhoops and carbon fiber reinforced polymer sheet[J].China Civil Engineering Journal,2005,38(8):10-17(in Chinese))
[13]Vandoros K G,Dritsos S E.Concrete jacket construction detail effectiveness when strengthening RC columns[J].Construction and Building Materials,2008,22(3):264-276
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