FRP加固桥梁RC短柱拟静力及网络拟动力试验
摘要
针对桥梁钢筋混凝土(RC)短柱刚度大而剪跨比小的特点,通过试验方法研究其抗震性能。制作了7个受剪承载力不足的短柱试件,在恒定轴力作用下分别进行未加固短柱、碳纤维(CFRP)加固短柱和玻璃纤维(GFRP)加固短柱的拟静力试验和网络拟动力试验。分析各试件的滞回曲线、骨架曲线、累积耗能曲线和刚度退化曲线,研究其延性、强度和刚度,并初步比较了拟静力试验结果与拟动力试验结果的差异。试验结果表明:FRP加固RC短柱能够在基本不改变结构动力特性的条件下,有效地增加延性,改善抗震性能;试件在拟动力试验中耗能能力小于拟静力试验中耗能能力。研究成果可为加固RC结构的抗震分析和工程设计提供参考。
Since reinforcement concrete short column of bridge had a large stiffness but its shear span ratio was small,the seismic testing method was used to explore the seismic performances.Seven specimens lacking of shearing strength were constructed,quasi-static testing(QST) and the networked pseudo-dynamic testing(NPDT) were carried out under an invariable axial force,the models included specimens which were not retrofitted,specimens retrofitted by carbon fiber reinforced plastic(CFRP) and specimens retrofitted by glass fiber reinforced plastic(GFRP).The results under different working conditions were analyzed and compared.The hysteretic curve,skeleton curve,energy dissipation curve and stiffness degradation curve were obtained.Furthermore,the ductility,strength and stiffness were researched,and the difference between results of QST and NPDT were compared.The results indicate that the RC short columns retrofitted by fiber reinforced plastic have superior ductility so as to enhance the seismic performances effectively,but have no influence on dynamic characteristics.The energy dissipation capacity of specimens under NPDT is less than under QST.The research provides reference to seismic analysis and engineering design of retrofitted reinforcement concrete structures.
Since reinforcement concrete short column of bridge had a large stiffness but its shear span ratio was small,the seismic testing method was used to explore the seismic performances.Seven specimens lacking of shearing strength were constructed,quasi-static testing(QST) and the networked pseudo-dynamic testing(NPDT) were carried out under an invariable axial force,the models included specimens which were not retrofitted,specimens retrofitted by carbon fiber reinforced plastic(CFRP) and specimens retrofitted by glass fiber reinforced plastic(GFRP).The results under different working conditions were analyzed and compared.The hysteretic curve,skeleton curve,energy dissipation curve and stiffness degradation curve were obtained.Furthermore,the ductility,strength and stiffness were researched,and the difference between results of QST and NPDT were compared.The results indicate that the RC short columns retrofitted by fiber reinforced plastic have superior ductility so as to enhance the seismic performances effectively,but have no influence on dynamic characteristics.The energy dissipation capacity of specimens under NPDT is less than under QST.The research provides reference to seismic analysis and engineering design of retrofitted reinforcement concrete structures.
引文
[1]Bonacci J F,Maalej M.Externally bonded FRP forservice life extension of RC infrastructure[J].Journalof Infrastructure System,2000,6(1):41-51.
[2]Priestley M J N,Seible F,Xiao Y,et al.Steel jacketretrofit of short RC bridge columns for enhanced shearstrength———Part 1:Theoretical considerations and testdesign[J].ACI Structure Journal,1994,91(4):394-405.
[3]Priestley M J N,Seible F,Xiao Y,et al.Steel jacketretrofit of short RC bridge columns for enhanced shearstrength———Part 2:Experimental results[J].ACIStructure Journal,1994,91(5):537-551.
[4]于清,陶忠,高献.FRP约束混凝土柱抗震性能若干问题的探讨[J].地震动工程与工程振动,2006,26(4):75-82.(YU Qing,TAO Zhong,GAO Xian.Several problems in seismic behavior of FRP-confinedconcrete columns[J].Earthquake Engineering andEngineering Vibration,2006,26(4):75-82.(inChinese))
[5]Xiao Y,Priestley MJ N,Seible F.Seismic assessmentand retrofit of bridge column footing[J].ACI StructureJournal,1996,93(1):79-94.
[6]陶忠,于清,韩林海,等.FRP约束钢筋混凝土圆柱力学性能的试验研究[J].建筑结构学报,2004,25(6):75-82.(TAO Zhong,YU Qing,HAN Linhai,etal.Experimental behavior of FRP-confined circular RCcolumns[J].Journal of Building Structures,2004,25(6):75-82.(in Chinese))
[7]李忠献,许成祥,景萌,等.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,XUChengxiang,JING Meng,et al.Experimental research on seismicbehavior of reinforced concrete short columnsstrengthened with carbon fiber sheets[J].Journal ofBuilding Structures,2002,23(6):41-48.(inChinese))
[8]刘保东,牛晓斐,王建兵.FRP加固钢筋混凝土桥墩的抗震性能分析[J].工程抗震与加固改造,2006,28(6):85-89.(Liu Baodong,Niu Xiaofei,Wang Jianbing.Earthquake resistant behavior ofreinforced concrete piers strengthened with FRP[J].Earthquake Resistant Engineering and Retrofitting,2006,28(6):85-89.(in Chinese))
[9]叶列平,赵树红,李全旺,等.碳纤维布加固混凝土柱的斜截面受剪承载力计算[J].建筑结构学报,2000,21(2):59-67.(YE Lieping,ZHAO Shuhong,LI Quanwang,et al.Calculation of shear strength ofconcrete column strengthened with carbon fiberreinforced plastic sheet[J].Journal of BuildingStructures,2000,21(2):59-67.(in Chinese))
[10]刘钧,侯杰,邱法维.钢筋混凝土独柱式桥墩的拟动力试验研究[J].工程抗震与加固改造,2006,28(5):43-48.(Liu Jun,Hou Jie,Qiu Fawei.Pseudo-dynamic test research of reinforced concrete bridgecolumn pier[J].Earthquake Resistant Engineering andRetrofitting,2006,28(5):43-48.(in Chinese))
[11]JGJ 101—96建筑抗震试验方法规程[S].(JGJ101—96 Specificating of testing methods forearthquake resistant building[S].(in Chinese))
[12]肖岩,胡庆,郭玉荣,等.结构拟动力远程协同试验网络平台的开发研究[J].建筑结构学报,2005,26(3):122-129.(XIAO Yan,HU Qing,GUO Yurong,et al.A network platform for remote pseudo-dynamictesting[J].Journal of Building Structures,2005,26(3):122-129.(in Chinese))
[13]郭玉荣,张国伟,肖岩,等.单自由度结构远程分析及拟动力试验平台[J].湖南大学学报(自然科学版),2006,33(2):18-21.(GUO Yurong,ZHANGGuowei,XIAO Yan,et al.A platform for remoteanalysis and pseudo-dynamic testing of SDOF structures[J].Journal of Hunan University(Natural Sciences),2006,33(2):18-21.(in Chinese))
[14]王伟.碳纤维布加固混凝土圆截面短柱抗震性能试验研究[D].哈尔滨:哈尔滨工业大学,2005.(WANG Wei.Experimental investigation on seismicperformance of CFRP retrofitted RC short columns withcircular section[D].Harbin:Harbin Institute ofTechnology,2005.(in Chinese))
[15]董旭华,王伟,肖岩,等.纤维塑料加固与修复RC短柱抗震性能试验[J].沈阳建筑大学学报(自然科学版),2006,22(2):252-256.(DONG Xuhua,WANG Wei,XIAO Yan,et al.Experimental study onseismic retrofit and repair of circular reinforcementconcrete short columns by fiber reinforced plastic[J].Journal of Shenyang Jianzhu University(NaturalScience),2006,22(2):252-256.(in Chinese))
[16]董旭华,肖岩,王伟,等.GFRP加固RC桥梁短柱滞回性能试验与分析[J].武汉理工大学学报,2006,28(7):59-62.(DONG Xuhua,XIAO Yan,WANG Wei,et al.Hysteretic behavior of GFRPretrofitted RC bridge short columns[J].Journal ofWuhan University of Technology,2006,28(7):59-62.(in Chinese))
[17]Priestley M J N,Seible F,Uang C M.The Northridgeearthquake of January 17,1994———Damage analysis ofselected freeway bridges[R].California:University ofCalifornia,1994.
[2]Priestley M J N,Seible F,Xiao Y,et al.Steel jacketretrofit of short RC bridge columns for enhanced shearstrength———Part 1:Theoretical considerations and testdesign[J].ACI Structure Journal,1994,91(4):394-405.
[3]Priestley M J N,Seible F,Xiao Y,et al.Steel jacketretrofit of short RC bridge columns for enhanced shearstrength———Part 2:Experimental results[J].ACIStructure Journal,1994,91(5):537-551.
[4]于清,陶忠,高献.FRP约束混凝土柱抗震性能若干问题的探讨[J].地震动工程与工程振动,2006,26(4):75-82.(YU Qing,TAO Zhong,GAO Xian.Several problems in seismic behavior of FRP-confinedconcrete columns[J].Earthquake Engineering andEngineering Vibration,2006,26(4):75-82.(inChinese))
[5]Xiao Y,Priestley MJ N,Seible F.Seismic assessmentand retrofit of bridge column footing[J].ACI StructureJournal,1996,93(1):79-94.
[6]陶忠,于清,韩林海,等.FRP约束钢筋混凝土圆柱力学性能的试验研究[J].建筑结构学报,2004,25(6):75-82.(TAO Zhong,YU Qing,HAN Linhai,etal.Experimental behavior of FRP-confined circular RCcolumns[J].Journal of Building Structures,2004,25(6):75-82.(in Chinese))
[7]李忠献,许成祥,景萌,等.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,XUChengxiang,JING Meng,et al.Experimental research on seismicbehavior of reinforced concrete short columnsstrengthened with carbon fiber sheets[J].Journal ofBuilding Structures,2002,23(6):41-48.(inChinese))
[8]刘保东,牛晓斐,王建兵.FRP加固钢筋混凝土桥墩的抗震性能分析[J].工程抗震与加固改造,2006,28(6):85-89.(Liu Baodong,Niu Xiaofei,Wang Jianbing.Earthquake resistant behavior ofreinforced concrete piers strengthened with FRP[J].Earthquake Resistant Engineering and Retrofitting,2006,28(6):85-89.(in Chinese))
[9]叶列平,赵树红,李全旺,等.碳纤维布加固混凝土柱的斜截面受剪承载力计算[J].建筑结构学报,2000,21(2):59-67.(YE Lieping,ZHAO Shuhong,LI Quanwang,et al.Calculation of shear strength ofconcrete column strengthened with carbon fiberreinforced plastic sheet[J].Journal of BuildingStructures,2000,21(2):59-67.(in Chinese))
[10]刘钧,侯杰,邱法维.钢筋混凝土独柱式桥墩的拟动力试验研究[J].工程抗震与加固改造,2006,28(5):43-48.(Liu Jun,Hou Jie,Qiu Fawei.Pseudo-dynamic test research of reinforced concrete bridgecolumn pier[J].Earthquake Resistant Engineering andRetrofitting,2006,28(5):43-48.(in Chinese))
[11]JGJ 101—96建筑抗震试验方法规程[S].(JGJ101—96 Specificating of testing methods forearthquake resistant building[S].(in Chinese))
[12]肖岩,胡庆,郭玉荣,等.结构拟动力远程协同试验网络平台的开发研究[J].建筑结构学报,2005,26(3):122-129.(XIAO Yan,HU Qing,GUO Yurong,et al.A network platform for remote pseudo-dynamictesting[J].Journal of Building Structures,2005,26(3):122-129.(in Chinese))
[13]郭玉荣,张国伟,肖岩,等.单自由度结构远程分析及拟动力试验平台[J].湖南大学学报(自然科学版),2006,33(2):18-21.(GUO Yurong,ZHANGGuowei,XIAO Yan,et al.A platform for remoteanalysis and pseudo-dynamic testing of SDOF structures[J].Journal of Hunan University(Natural Sciences),2006,33(2):18-21.(in Chinese))
[14]王伟.碳纤维布加固混凝土圆截面短柱抗震性能试验研究[D].哈尔滨:哈尔滨工业大学,2005.(WANG Wei.Experimental investigation on seismicperformance of CFRP retrofitted RC short columns withcircular section[D].Harbin:Harbin Institute ofTechnology,2005.(in Chinese))
[15]董旭华,王伟,肖岩,等.纤维塑料加固与修复RC短柱抗震性能试验[J].沈阳建筑大学学报(自然科学版),2006,22(2):252-256.(DONG Xuhua,WANG Wei,XIAO Yan,et al.Experimental study onseismic retrofit and repair of circular reinforcementconcrete short columns by fiber reinforced plastic[J].Journal of Shenyang Jianzhu University(NaturalScience),2006,22(2):252-256.(in Chinese))
[16]董旭华,肖岩,王伟,等.GFRP加固RC桥梁短柱滞回性能试验与分析[J].武汉理工大学学报,2006,28(7):59-62.(DONG Xuhua,XIAO Yan,WANG Wei,et al.Hysteretic behavior of GFRPretrofitted RC bridge short columns[J].Journal ofWuhan University of Technology,2006,28(7):59-62.(in Chinese))
[17]Priestley M J N,Seible F,Uang C M.The Northridgeearthquake of January 17,1994———Damage analysis ofselected freeway bridges[R].California:University ofCalifornia,1994.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心