考虑FRP加固构件耗能的RC框架抗震性能评估
|
摘要
采用能力谱法评估FRP加固RC框架结构抗震性能时,需求谱所使用的等效阻尼比是依据普通RC框架变形(延性系数)-等效阻尼比关系得到的,并未考虑FRP加固RC构件比普通RC构件多消耗能量(简称FRP构件耗能增量)对整体框架等效阻尼比的影响。根据相关试验结果拟合出FRP加固RC构件等效阻尼比表达式,计算FRP构件耗能增量,确定考虑FRP构件耗能增量的"修正"整体框架等效阻尼比。基于"修正"的框架等效阻尼比,确定FRP加固RC框架的顶点位移和关键层(加固层)层间位移,可以更加准确地评估FRP加固RC框架的抗震性能。算例表明,该方法可行。使用该方法计算结构各振型的地震反应,结合SRSS方法,可评估受高阶振型影响的FRP加固RC框架。
Evaluating seismic retrofit performance of RC frame using FRP composites usually do not consider the additional energy dissipation of components retrofitted with FRP composites compared with the original ones based on capacity spectrum method. According to the test data,the equivalent damping ratio expression of components retrofitted with FRP composites is derived,and the additional energy dissipation can be calculated by using it. The whole frame's equivalent damping ratio considering additional energy dissipation is found on the basis of its definition. The seismic retrofit performance of RC frame using FRP composites can be evaluated more accurately by using"fix"frame' equivalent damping ratio. The example shows that the proposed method is feasible and can be apply to the RC frame retrofitted with FRP composites which is influenced by high modes.
Evaluating seismic retrofit performance of RC frame using FRP composites usually do not consider the additional energy dissipation of components retrofitted with FRP composites compared with the original ones based on capacity spectrum method. According to the test data,the equivalent damping ratio expression of components retrofitted with FRP composites is derived,and the additional energy dissipation can be calculated by using it. The whole frame's equivalent damping ratio considering additional energy dissipation is found on the basis of its definition. The seismic retrofit performance of RC frame using FRP composites can be evaluated more accurately by using"fix"frame' equivalent damping ratio. The example shows that the proposed method is feasible and can be apply to the RC frame retrofitted with FRP composites which is influenced by high modes.
引文
[1]Cem Yalcin,Osman Kaya,Mustafa Sinangil.Seismic retrofitting of R/C columns having plain rebars using CFRP sheets for improved strength and ductility[J].Construction and Building Materials,2008(22):295-307.
[2]Sergio F.Brea,Benjamin,Hysteretic behavior of bridge columns with FRP-jacketed lap splices designed for moderate ductility enhancement[J].Journal of Composites for Construction,2007,11(6):565-574.
[3]Realfonzo R,Napoli A.Cyclic behavior of RC columns strengthened by FRP and steel devices[J].Journal of Structural Engineering,2009,135(10):1164-1176.
[4]DONG Shenggu,WU Gang,WU Zhishen,et al.Confinement effectiveness of FRP in retrofitting circular concrete columns under simulated seismic load[J].Journal of Composites for Construction,2010,14(5):531-540.
[5]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].地震工程与工程振动,2006,26(4):75-82.YU Qing,TAO Zhong,GAO Xian.Several problem in seismic behavior of FRP-confined concrete columns[J].Journal of Earthquake Engineering and Engineering Vibration,2006,26(4):75-82.(in Chinese)
[6]Okan Ozcana,Baris Binicib,Guney Ozcebeb.Seismic strengthening of rectangular reinforced concrete columns using fiber reinforced polymers[J].Engineering Structures,2010(32):964-973.
[7]Colomb F,Tobbi H,Ferrier E,et al.Seismic retrofit of reinforced concrete short columns by CFRP materials[J].Composite Structures,2008(82):475-487.
[8]马恺泽,刘伯权,鄢红良,等.高层建筑结构抗震性能评估方法的研究与改进[J].建筑科学与工程学报,2012,29(4):32-37.MA Kaiwei,LIU Boquan,YAN Hongliang,et al.Research and improvement on seismic performance evaluation method of high-rise building structures[J].Journal of Architecture and Civil Engineering,2012,29(4):32-37.(in Chinese)
[9]李浩,王文,易伟建.基于能力谱的概率-非概率结构体系抗震可靠度[J].地震工程与工程振动,2012,32(1):43-48.LI Hao,WANG Wen,YI Weijian.Probabilistic&non-probabilistic hybrid seismic reliability of structure system based on capacity spectrum method[J].Journal of Earthquake Engineering and Engineering Vibration,2012,32(1):43-48.(in Chinese)
[10]杨伟,欧进萍.损伤谱在结构抗震性能评估中的应用[J].地震工程与工程振动,2011,31(2):40-46.YANG Wei,OU Jinping.Seismic capacity evaluation of RC frames with inelastic damage spectra[J].Journal of Earthquake Engineering and Engineering Vibration,2011,31(2):40-46.(in Chinese)
[11]Kowalsky M J,Priestley M J N,Macrae G A.Displacement-based design of RC bridge columns in seismic regions[J].Earthquake Eng.Struct.Dyn.,1995,24(12):1623-1643.
[12]Building Seismic Safety Council(1997).NEHRP Guidelines for the Seismic Rehabilitation of Buildings[S].FEMA-273,Federal Emergency Management Agency,Washington,D.C.
[13]Gulkan P,Sozen M A.Inelastic response of reinforced concrete structures to earthquake motions[J].ACI Journal,1974,71:604-610.
[14]罗文斌,钱稼茹.钢筋混凝土框架基于位移的抗震设计[J].土木工程学报,2003,36(5):22-29.LUO Wenbin,QIAN Jiaru.Displacement-based seismic design for RC frames[J].China Civil Engineering Journal,2003,36(5):22-29.(in Chinese)
[15]盛国华,朱浮声,徐明磊.基于性能的FRP加固混凝土柱抗震水平及指标选取[J].东北大学学报(自然科学版),2012,33(2):284-287.SHENG Guohua,ZHU Fusheng,XU Minglei.Performance-based seismic level division and index choosing for RC column strengthened with FRP[J].Journal of Northeastern University(Natural Science),2012,33(2):284-287.(in Chinese)
[2]Sergio F.Brea,Benjamin,Hysteretic behavior of bridge columns with FRP-jacketed lap splices designed for moderate ductility enhancement[J].Journal of Composites for Construction,2007,11(6):565-574.
[3]Realfonzo R,Napoli A.Cyclic behavior of RC columns strengthened by FRP and steel devices[J].Journal of Structural Engineering,2009,135(10):1164-1176.
[4]DONG Shenggu,WU Gang,WU Zhishen,et al.Confinement effectiveness of FRP in retrofitting circular concrete columns under simulated seismic load[J].Journal of Composites for Construction,2010,14(5):531-540.
[5]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].地震工程与工程振动,2006,26(4):75-82.YU Qing,TAO Zhong,GAO Xian.Several problem in seismic behavior of FRP-confined concrete columns[J].Journal of Earthquake Engineering and Engineering Vibration,2006,26(4):75-82.(in Chinese)
[6]Okan Ozcana,Baris Binicib,Guney Ozcebeb.Seismic strengthening of rectangular reinforced concrete columns using fiber reinforced polymers[J].Engineering Structures,2010(32):964-973.
[7]Colomb F,Tobbi H,Ferrier E,et al.Seismic retrofit of reinforced concrete short columns by CFRP materials[J].Composite Structures,2008(82):475-487.
[8]马恺泽,刘伯权,鄢红良,等.高层建筑结构抗震性能评估方法的研究与改进[J].建筑科学与工程学报,2012,29(4):32-37.MA Kaiwei,LIU Boquan,YAN Hongliang,et al.Research and improvement on seismic performance evaluation method of high-rise building structures[J].Journal of Architecture and Civil Engineering,2012,29(4):32-37.(in Chinese)
[9]李浩,王文,易伟建.基于能力谱的概率-非概率结构体系抗震可靠度[J].地震工程与工程振动,2012,32(1):43-48.LI Hao,WANG Wen,YI Weijian.Probabilistic&non-probabilistic hybrid seismic reliability of structure system based on capacity spectrum method[J].Journal of Earthquake Engineering and Engineering Vibration,2012,32(1):43-48.(in Chinese)
[10]杨伟,欧进萍.损伤谱在结构抗震性能评估中的应用[J].地震工程与工程振动,2011,31(2):40-46.YANG Wei,OU Jinping.Seismic capacity evaluation of RC frames with inelastic damage spectra[J].Journal of Earthquake Engineering and Engineering Vibration,2011,31(2):40-46.(in Chinese)
[11]Kowalsky M J,Priestley M J N,Macrae G A.Displacement-based design of RC bridge columns in seismic regions[J].Earthquake Eng.Struct.Dyn.,1995,24(12):1623-1643.
[12]Building Seismic Safety Council(1997).NEHRP Guidelines for the Seismic Rehabilitation of Buildings[S].FEMA-273,Federal Emergency Management Agency,Washington,D.C.
[13]Gulkan P,Sozen M A.Inelastic response of reinforced concrete structures to earthquake motions[J].ACI Journal,1974,71:604-610.
[14]罗文斌,钱稼茹.钢筋混凝土框架基于位移的抗震设计[J].土木工程学报,2003,36(5):22-29.LUO Wenbin,QIAN Jiaru.Displacement-based seismic design for RC frames[J].China Civil Engineering Journal,2003,36(5):22-29.(in Chinese)
[15]盛国华,朱浮声,徐明磊.基于性能的FRP加固混凝土柱抗震水平及指标选取[J].东北大学学报(自然科学版),2012,33(2):284-287.SHENG Guohua,ZHU Fusheng,XU Minglei.Performance-based seismic level division and index choosing for RC column strengthened with FRP[J].Journal of Northeastern University(Natural Science),2012,33(2):284-287.(in Chinese)
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