组合FRP技术加固混凝土矩形柱的抗震性能试验研究
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摘要
研究了一种利用植筋及纤维增强复合材料(FRP)布横向包裹钢筋混凝土柱来改善其抗震性能的新型加固技术。通过5个钢筋混凝土方柱的模型试验,分别研究了植玻璃纤维(GFRP)筋、横向包裹碳纤维(CFRP)布及两者组合的加固技术对提高混凝土柱抗震性能的作用,分析讨论了不同加固方法对混凝土柱位移延性系数的提高、刚度退化及能量耗散能力的影响。试验结果表明,采用植GFRP筋和包裹CFRP布的组合加固技术较前两种加固方法能更加有效地改善钢筋混凝土柱的抗震性能。
A new retrofit method for improving the seismic behavior of reinforced concrete columns is developed in which the embedded bars and fiber-reinforced-plastics (FRP) sheets are used in the retrofitted area. Five reinforced concrete square columns were tested to examine the effect of GFRP (glass FRP)-bars, CFRP (carbon FRP) sheets and their hybridized method on seismic behavior, as well as that on the increase of displacement ductility ratio, stiffness degradation, and energy dissipation. Experimental results show that the new retrofit method of combining embedding FRP-bars and wrapping CFRP sheets is very effective in improving the seismic behavior of concrete columns compared with the other two methods.
A new retrofit method for improving the seismic behavior of reinforced concrete columns is developed in which the embedded bars and fiber-reinforced-plastics (FRP) sheets are used in the retrofitted area. Five reinforced concrete square columns were tested to examine the effect of GFRP (glass FRP)-bars, CFRP (carbon FRP) sheets and their hybridized method on seismic behavior, as well as that on the increase of displacement ductility ratio, stiffness degradation, and energy dissipation. Experimental results show that the new retrofit method of combining embedding FRP-bars and wrapping CFRP sheets is very effective in improving the seismic behavior of concrete columns compared with the other two methods.
引文
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[8]Priestley M J N,Seible F,Xiao Y,Verma R.Steel jacket retrofitting of reinforced concrete bridge columns for enhanced shear strength-part1:Theoretical consideration and test design[J].ACI Structural Journal,1994,91(4):394~405.
[9]ACI Committee440.Guide for the design and construction of concrete reinforced with FRP bars[R].Farmington Hills,Michigan,American Concrete Institute,2001.
[10]Priestley M J N,Park R.Strength and ductility of concrete bridge columns under seismic loading[J].ACI Structural Journal,1987,84(1):61~76.
[11]Liddell D P,Ingham J M,Davidson B J.Influence of loading history on the ultimate displacement of ductility6-current design concrete structure[A].Proceedings of Australian Structural Engineering Conference[C].Gold Coast,Australia,2001.231~238.
[12]Liddell D P.Influence of loading history on ultimate displacement of concrete structures[D].University of Auckland,New Zealand,2000.
[13]范立础,卓卫东.桥梁延性抗震设计[M].北京:人民交通出版社,2001.Fan Lichu,Zhuo Weidong.Seismic design of ductile bridges[M].Beijing:China Communications Press,2001.(in Chinese)
[2]ACI Committee440.Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures[R].Farmington Hills,Michigan,American Concrete Institute,2002.
[3]Priestley M J N,Seible F.Design of seismic retrofit measures for concrete and masonry structures[J].Construction and Building Materials,1995,9(6):365~377.
[4]李忠献,许成祥.碳纤维布加固钢筋混凝土短柱的抗震性能试验研究[J].建筑结构学报,2002,23(6):41~48.Li Zhongxian,Xu Chengxiang.Experimental research on seismic behavior of reinforced concrete short columns strengthened with carbon fiber sheets[J].Journal of Building Structures,2002,23(6):41~48.(in Chinese)
[5]赵彤,周晓杰.用碳纤维布改善钢筋混凝土极短柱抗震性能的试验研究[J].地震工程与工程振动,2002,22(1):85~91.Zhao Tong,Zhou Xiaojie.Research on improving seismic behavior of reinforced concrete short columns with continuous carbon fiber sheet[J].Earthquake Engineering and Engineering Vibration,2002,22(1):85~91.(in Chinese)
[6]张轲,岳清瑞.碳纤维布加固混凝土柱改善延性的试验研究[J].工业建筑,2000,30(2):16~19.Zhang Ke,Yue Qingrui.Experimental research on ductility improvement of concrete columns strengthened with CFS[J].Industrial Construction,2000,30(2):16~19.(in Chinese)
[7]Iacobucci R D,Sheikh S A,Bayrak O.Retrofit of square concrete columns with carbon fiber-reinforced polymer for seismic resistance[J].ACI Structural Journal,2003,100(6):785~794.
[8]Priestley M J N,Seible F,Xiao Y,Verma R.Steel jacket retrofitting of reinforced concrete bridge columns for enhanced shear strength-part1:Theoretical consideration and test design[J].ACI Structural Journal,1994,91(4):394~405.
[9]ACI Committee440.Guide for the design and construction of concrete reinforced with FRP bars[R].Farmington Hills,Michigan,American Concrete Institute,2001.
[10]Priestley M J N,Park R.Strength and ductility of concrete bridge columns under seismic loading[J].ACI Structural Journal,1987,84(1):61~76.
[11]Liddell D P,Ingham J M,Davidson B J.Influence of loading history on the ultimate displacement of ductility6-current design concrete structure[A].Proceedings of Australian Structural Engineering Conference[C].Gold Coast,Australia,2001.231~238.
[12]Liddell D P.Influence of loading history on ultimate displacement of concrete structures[D].University of Auckland,New Zealand,2000.
[13]范立础,卓卫东.桥梁延性抗震设计[M].北京:人民交通出版社,2001.Fan Lichu,Zhuo Weidong.Seismic design of ductile bridges[M].Beijing:China Communications Press,2001.(in Chinese)
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