层内混杂FRP加固混凝土柱抗震性能
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摘要
为了研究将延性好的混杂纤维布(HFRP)用于结构抗震加固的可行性,通过7根钢筋混凝土方柱的低周反复推拉加载试验,研究了HFRP加固混凝土方柱的抗震性能,分析了HFRP加固方柱的破坏形态、滞回曲线、骨架曲线、延性、刚度退化以及耗能能力,探讨了轴压比、HFRP粘贴层数以及配箍率对HFRP加固方柱抗震性能的影响.试验表明:粘贴HFRP能有效提高方柱的抗震性能;轴压比对HFRP加固方柱的影响较大,低轴压比更有利于HFRP对混凝土柱约束作用的发挥,轴压比越高,越不利于HFRP后期约束作用的发挥,柱延性越低;增加HFRP层数在低轴压比时方柱抗震性能提高明显,而在高轴压比时效果不大;配箍率的增大能提高方柱抗震性能,有利于方柱抗震.
In order to research the feasibility of structural seismic retrofit with Hybrid FRP(HFRP) ,seven square reinforced concrete columns are tested under low cyclic alternate load to investigate the performances such as seismic behaviors,failure mode,hysteresis curves,skeleton curves,ductility,degradation of stiffness and energy consumption of square columns strengthened with HFRP. The effects of the axial load ratio,the amount of HFRP and the stirrup ratio on the seismic performance of square columns strengthened with HFRP are studied. The results show that the seismic performance can be improved effectively for square columns strengthened with HFRP. The effect of axial load ratio is great,and HFRP can confine concrete more effectively when the axial load ratio is low. The higher the axial load ratio is,the lower the confinement and the ductility are. The results also indicate that increasing the amount of HFRP can improve the seismic performance effectively when the axial load ratio is low but barely have any effect when the axial load ratio is high. The seismic performance of the square columns can be improved significantly by increasing the stirrup ratio.
In order to research the feasibility of structural seismic retrofit with Hybrid FRP(HFRP) ,seven square reinforced concrete columns are tested under low cyclic alternate load to investigate the performances such as seismic behaviors,failure mode,hysteresis curves,skeleton curves,ductility,degradation of stiffness and energy consumption of square columns strengthened with HFRP. The effects of the axial load ratio,the amount of HFRP and the stirrup ratio on the seismic performance of square columns strengthened with HFRP are studied. The results show that the seismic performance can be improved effectively for square columns strengthened with HFRP. The effect of axial load ratio is great,and HFRP can confine concrete more effectively when the axial load ratio is low. The higher the axial load ratio is,the lower the confinement and the ductility are. The results also indicate that increasing the amount of HFRP can improve the seismic performance effectively when the axial load ratio is low but barely have any effect when the axial load ratio is high. The seismic performance of the square columns can be improved significantly by increasing the stirrup ratio.
引文
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[7]SHEIKH S A,LI Yi-min.Design of FRP confinement for square concrete columns[J].Engineering Structures,2007,29(6):1074-1083.
[8]过镇海,时旭东.钢筋混凝土原理和分析[M].北京:清华大学出版社,2003:336-337.
[2]顾冬生,吴刚,吴智深,等.CFRP加固高轴压比钢筋混凝土短圆柱抗震性能试验研究[J].工程抗震与加固改造,2006,28(6):71-77.GU Dong-sheng,WU Gang,WU Zhi-shen,et al.Experimental study on seismic performance of RC short circular columnsstrengthened with CFRP composites under high-level compression[J].Earthquake Resistant Engineering and Retrofitting,2006,28(6):71-77.(in Chinese)
[3]赵彤,刘明国,谢剑,等.碳纤维布改善高强混凝土柱延性的试验研究[J].地震工程与工程振动,2001,21(4):46-52.ZHAO Tong,LIU Ming-guo,XIE Jian,et al.Experimental study on the application of continuous carbon fiber sheet to improve the ductility of high-strength concrete columns[J].Earthquake Engineering and Engineering Vibration,2001,21(4):46-52.(in Chinese)
[4]吴刚,魏洋,吴智深,等.玄武岩纤维与碳纤维加固混凝土矩形柱抗震性能比较研究[J].工业建筑,2007,37(6):14-18.WU Gang,WEI Yang,WU Zhi-shen,et al.Comparative study on seismic performance of rectangular concrete columns strengthened with BFRP and CFRP composites[J].Industrial Construction,2007,37(6):14-18.(in Chinese)
[5]SEIBLE F,PRIESTLEY M J N,HEGEMIER G A,et al.Seismic retrofit of RC columns with continuous carbon fiber jackets[J].ASCE,Journal of Composites for Construction,1997,1(2):52-62.
[6]SAADATMANESH H,EHSANI M R,JIN Li-min.Seismic strengthening of circular bridge pier models with fiber composite straps[J].ACI Structural Journal,1996,93(6):639-647.
[7]SHEIKH S A,LI Yi-min.Design of FRP confinement for square concrete columns[J].Engineering Structures,2007,29(6):1074-1083.
[8]过镇海,时旭东.钢筋混凝土原理和分析[M].北京:清华大学出版社,2003:336-337.
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