FRP增强混凝土框架节点恢复力模型
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摘要
为研究FRP增强混凝土梁柱节点及其组成框架结构的整体抗震性能,基于FRP增强混凝土梁柱节点的拟静力试验结果,分析了各类试验节点的滞回特性.考虑刚度退化的影响,提出FRP增强混凝土框架节点的三折线恢复力模型及其特征参数取值范围,并给出层间混杂FRP加固节点的恢复力模型表达式.结果表明,各类FRP加固节点的抗震性能相对于对比构件有明显的提高,相对而言层间混杂FRP的增强作用更为有效.所建立的恢复力模型骨架曲线与试验值非常接近,此模型可用于FRP增强混凝土框架结构的弹塑性动力反应分析及其节点的抗震加固设计.
In order to investigate the seismic performance of concrete beam-column joints strengthened by fiber reinforced plastics(FRP) and the corresponding frame structure,based on the pseudo-static test results of these joints,the hysteretic characteristics of the connections were analyzed.Considering the effect of stiffness degradation,a three lines restoring force model of concrete frame joints reinforced with FRP was proposed and ranges of the characteristic parameters were determined.The expression of restoring force model for joints strengthened by interply hybrid FRP was suggested.The results show that the seismic performance of the joints strengthened by FRP is increased evidently and reinforcement of interplay hybrid FRP is more effective.The framework curve of proposed restoring force model is very close to the test data.This model can be used to analyze the elastic-plastic dynamic response of concrete frame reinforced with FRP and the seismic strengthening design of its connections.
In order to investigate the seismic performance of concrete beam-column joints strengthened by fiber reinforced plastics(FRP) and the corresponding frame structure,based on the pseudo-static test results of these joints,the hysteretic characteristics of the connections were analyzed.Considering the effect of stiffness degradation,a three lines restoring force model of concrete frame joints reinforced with FRP was proposed and ranges of the characteristic parameters were determined.The expression of restoring force model for joints strengthened by interply hybrid FRP was suggested.The results show that the seismic performance of the joints strengthened by FRP is increased evidently and reinforcement of interplay hybrid FRP is more effective.The framework curve of proposed restoring force model is very close to the test data.This model can be used to analyze the elastic-plastic dynamic response of concrete frame reinforced with FRP and the seismic strengthening design of its connections.
引文
[1]Ludovico M D,Prota A,Manfredi G,et al.Seismic strengthening of an under-designed RC structure with FRP[J].Earthquake Engineering and Structural Dy-namics,2008,37:141-162.
[2]Balsamo A,Colombo A,Manfredi G,et al.Seismic be-havior of a full-scale RC frame repaired using CFRP laminates[J].Engineering Structures,2005,27:769-780.
[3]吴波,王维俊.碳纤维布加固钢筋混凝土框架节点的抗震性能试验研究[J].土木工程学报,2005,38(4):60-65.Wu Bo,Wang Weijun.An experimental study on the seismic behavior of beam-column joints strengthened with carbon fiber sheets[J].China Civil Engineering Journal,2005,38(4):60-65.(in Chinese)
[4]王步,刘伯权,王溥.碳纤维布加固混凝土框架外节点抗震性能试验研究[J].工业建筑,2007,37(3):102-105.Wang Bu,Liu Boquan,Wang Pu.Experiment on seis-mic behavior of CFRP-strengthened exterior RC frame joints[J].Industrial Construction,2007,37(3):102-105.(in Chinese)
[5]El-Amoury T,Ghobarah A.Seismic rehabilitation of beam-column joint using GFRP sheets[J].Engineering Structures,2002,24:1397-1407.
[6]Parvin A,Wu Shanhong.Ply angle effect on fiber com-posite wrapped reinforced concrete beam-column connec-tions under combined axial and cyclic loads[J].Com-posite structures,2008,82:532-538.
[7]冼巧玲,江传良,周福霖.混凝土框架节点碳纤维布抗震加固的试验与分析[J].地震工程与工程振动,2007,27(2):104-111.Xian Qiaoling,Jiang Chuanliang,Zhou Fulin.Experi-ment and analysis of RC frame joints strengthened with carbon fiber sheet for increasing seismic capacity[J].Earthquake Engineering and Engineering Vibration,2007,27(2):104-111.(in Chinese)
[8]Karayannis C G,Sirkelis G M.Strengthening and reha-bilitation of RC beam-column joints using carbon-FRP jacketing and epoxy resin injection[J].Earthquake En-gineering and Structural Dynamics,2008,37:769-790.
[9]陈肇元,钱稼如.汶川地震建筑震害调查与灾后重建分析报告[M].北京:中国建筑工业出版社,2008.
[10]彭亚萍,王铁成,刘增夕.FRP增强混凝土平面框架边节点的抗震加固研究[J].建筑结构,2006,36(9):28-30.Peng Yaping,Wang Tiecheng,Liu Zengxi.Research on seismic performance of concrete beam-column joints reinforced with FRP[J].Building Structure,2006,36(9):28-30.(in Chinese)
[2]Balsamo A,Colombo A,Manfredi G,et al.Seismic be-havior of a full-scale RC frame repaired using CFRP laminates[J].Engineering Structures,2005,27:769-780.
[3]吴波,王维俊.碳纤维布加固钢筋混凝土框架节点的抗震性能试验研究[J].土木工程学报,2005,38(4):60-65.Wu Bo,Wang Weijun.An experimental study on the seismic behavior of beam-column joints strengthened with carbon fiber sheets[J].China Civil Engineering Journal,2005,38(4):60-65.(in Chinese)
[4]王步,刘伯权,王溥.碳纤维布加固混凝土框架外节点抗震性能试验研究[J].工业建筑,2007,37(3):102-105.Wang Bu,Liu Boquan,Wang Pu.Experiment on seis-mic behavior of CFRP-strengthened exterior RC frame joints[J].Industrial Construction,2007,37(3):102-105.(in Chinese)
[5]El-Amoury T,Ghobarah A.Seismic rehabilitation of beam-column joint using GFRP sheets[J].Engineering Structures,2002,24:1397-1407.
[6]Parvin A,Wu Shanhong.Ply angle effect on fiber com-posite wrapped reinforced concrete beam-column connec-tions under combined axial and cyclic loads[J].Com-posite structures,2008,82:532-538.
[7]冼巧玲,江传良,周福霖.混凝土框架节点碳纤维布抗震加固的试验与分析[J].地震工程与工程振动,2007,27(2):104-111.Xian Qiaoling,Jiang Chuanliang,Zhou Fulin.Experi-ment and analysis of RC frame joints strengthened with carbon fiber sheet for increasing seismic capacity[J].Earthquake Engineering and Engineering Vibration,2007,27(2):104-111.(in Chinese)
[8]Karayannis C G,Sirkelis G M.Strengthening and reha-bilitation of RC beam-column joints using carbon-FRP jacketing and epoxy resin injection[J].Earthquake En-gineering and Structural Dynamics,2008,37:769-790.
[9]陈肇元,钱稼如.汶川地震建筑震害调查与灾后重建分析报告[M].北京:中国建筑工业出版社,2008.
[10]彭亚萍,王铁成,刘增夕.FRP增强混凝土平面框架边节点的抗震加固研究[J].建筑结构,2006,36(9):28-30.Peng Yaping,Wang Tiecheng,Liu Zengxi.Research on seismic performance of concrete beam-column joints reinforced with FRP[J].Building Structure,2006,36(9):28-30.(in Chinese)
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