预应力碳纤维条带加固混凝土圆墩抗震性能试验
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摘要
针对地震灾害中桥墩柱的破坏形态,考虑轴压比变化、预应力大小、纤维布层数和加载顺序等因素的影响,对9根采用与未采用预应力碳纤维条带加固的钢筋混凝土圆形墩柱进行了低周反复荷载试验研究。通过各试件主要破坏形态和滞回曲线的对比,分析了各因素对承载力、延性性能、滞回特性、耗能能力等重要抗震性能指标的影响。结果表明:采用预应力碳纤维条带加固后,柱的承载力、延性性能、耗能能力均有较大幅度提升;预应力碳纤维条带提供的主动横向约束力能有效抑制斜向剪切裂缝的开展,将圆墩柱的破坏形态由剪切破坏转变为延性较好的弯曲破坏;先施加轴力后进行预应力碳纤维条带加固所得的加固承载力低于后施加轴力的试件。
Aimed at the failure modes of piers in earthquake, considering the influence of axialcompression ratio, pre-stress of carbon fiber reinforced polymer (CFRP) belts, layers of CFRPbelts and loading sequences, test on nine RC piers strengthened with pre-stressed CFRP beltsunder lateral low cyclic load and constant axial load was carried out. By comparing the failuremodes and hysteresis curves of the specimens, the influence of each parameter on the bearingcapacity, ductility, hysteretic behavior and energy dissipating capacity was analyzed. The resultsshow that the bearing capacity, ductility and energy dissipating capacity of the strengthened piersare improved significantly. The diagonal shear cracking can be inhibited by the lateral activeconfined stress provided by pre-stressed CFRP belts, and then the failure mechanism of thespecimens strengthened with pre-stressed CFRP belts can be changed from shear to flexure whichis of satisfactory ductility. Compared with the sequence of strengthcning with pre-stressed CFRPbelts at first and then exerting axial load, the sequence of exerting axial load at first will decrease the bearing capacity of the specimens.
Aimed at the failure modes of piers in earthquake, considering the influence of axialcompression ratio, pre-stress of carbon fiber reinforced polymer (CFRP) belts, layers of CFRPbelts and loading sequences, test on nine RC piers strengthened with pre-stressed CFRP beltsunder lateral low cyclic load and constant axial load was carried out. By comparing the failuremodes and hysteresis curves of the specimens, the influence of each parameter on the bearingcapacity, ductility, hysteretic behavior and energy dissipating capacity was analyzed. The resultsshow that the bearing capacity, ductility and energy dissipating capacity of the strengthened piersare improved significantly. The diagonal shear cracking can be inhibited by the lateral activeconfined stress provided by pre-stressed CFRP belts, and then the failure mechanism of thespecimens strengthened with pre-stressed CFRP belts can be changed from shear to flexure whichis of satisfactory ductility. Compared with the sequence of strengthcning with pre-stressed CFRPbelts at first and then exerting axial load, the sequence of exerting axial load at first will decrease the bearing capacity of the specimens.
引文
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[16]郭子雄,张杰,杨勇.设置外包预应力钢板箍RC短柱抗震性能研究[J].哈尔滨工业大学学报,2006,38(1):140-144.GUO Zi-xiong,ZHANG Jie,YANG Yong.Study onthe Seismic Performance of RC Column Confined byPrestrssed Steel Plate Hoops[J].Journal of HarbinInstitute of Technology,2006,38(1):140-144.
[2]庄卫林,刘振宇,蒋劲松.汶川大地震公路桥梁震害分析及对策[J].岩石力学与工程学报,2009,28(7):1377-1387.ZHUANG Wei-lin,LIU Zhen-yu,JIANG Jin-song.Earthquake-induced Damage Analysis of HighwayBridges in Wenchuan Earthquake and Countermeas-ures[J].Chinese Journal of Rock Mechanics and En-gineering,2009,28(7):1377-1387.
[3]陆新征.马玉虎,唐代远,等.汶川地震典型RC框架结构抗倒塌加固效果分析[J].建筑科学与工程学报，2011,28(2):21-27.LU Xin-zheng,MA Yu-hu,TANG Dai-yuan,et al.Strengthening Effect Analysis of Seismic Collapse Re-sistance of Typical RC Frame Structures in WenchuanEarthquake[J].Journal of Architecture and Civil En-gineering,2011,28(2):21-27.
[4]周长东,黄承逵.玻璃纤维聚合物加固混凝土柱抗震性能研究[J].哈尔滨工业大学学报,2006,38(3):427-431.ZHOU Chang-dong,HUANG Cheng-kui.Investiga-tion on Seismic-resistance Behavior of Concrete Col-umns Strengthened with GFRP[J].Journal of HarbinInstitute of Technology,2006,38(3):427-431.
[5]周长东,吕西林,金叶.火灾高温下玻璃纤维筋的力学性能研究[J].建筑科学与工程学报,2006,23(1):23-28.ZHOU Chang-dong,LU Xi-lin,JIN Ye.Research onMechanical Behavior of GFRP Bars in High Tempera-ture[J].Journal of Architecture and Civil Engineer-ing,2006,23(1):23-28.
[6]王伟,宋坤,王大鹏.纤维加固混凝土圆截面短柱抗震性能试验研究[J].世界地震工程,2008,24(4):96-100.WANG Wei,SONG Kun,WANG Da-peng.Experi-mental Investigation on Seismic Performance of CFRPRetrofited RC Short Columns with Circular Section[J].World Earthquake Engineering,2008,24(4):96-100.
[7]周朝阳,黄林,贺学军.粘贴预应力碳纤维布钢梁的放张效应[J].建筑科学与工程学报,2010,27(4):14一18.ZHOU Chao-yang,HUANG Lin,HE Xue-jun.Effectof Releasing Pretension for Steel Beams Bonded withPrestressed Carbon Fiber Sheet[J].Journal of Archi-tecture and Civil Engineering,2010,27(4):14-18.
[8]钟龙,郑山锁,王斌.采用碳纤维布加固预应力混凝土吊车梁的设计方法[J].建筑科学与工程学报,2007,24(2):54-58.ZHONG Long,ZHENG Shan-suo,WANG Bin,et al.Design Method of Strengthening Prestressed ConcreteCrane Girder Using CFRP[J].Journal of Architectureand Civil Engineering,2007,24(2):54-58.
[9]张建伟,张瑞云,杜修力.芳纶纤维布松弛性能试验[J].建筑科学与工程学报,2010,27(1):73-77.ZHANG Jian-wei,ZHANG Rui-yun,DU Xiu-li.Ex-periment of Relaxation Performance of AFRP Sheets[J].Journal of Architecture and Civil Engineering,2010,27(1):73-77.
[10]XIAO Y,MA R.Seismic Retrofit of RC Circular Col-umns Using Prefabricated Composite Kacketing[J].Journal of Structural Engineering,1997,123(10):1357-1364.
[11]SHEIKH S A.Performance of Concrete Structures Retrofitted with Fiber Reinforced Polymers[J].Engi-neering Structures,2002,24:869-879.
[12]YAMAKAWA T,NASROLLAHZADEH NESHELI K,SATOH H.Seismic or Emergency Retrofit of RC Short Columns by Use of Prestressed Aramid Fiber Belts as External Hoops[J].Journal of Structural and Construction Engineering,2001(550):135-141.
[13]NASROLLALAHZADEH NESHELI K,MEGURO K.Seismic Retrofitting of Eartherquake-damaged Concrete Columns by Lateral Pretensioning of FRP Belts[C]//EERI.Proceedings of the Eighth U.S.Na-tional Conference on Earthquake Engineering.San Francisco:EERI,2006:1-9.
[14]MEHDIZAD TALEIE S,MOGHADDAM H.Experi-mental and Analytical Investigation of Square RC Col-umns Retrofitted with Pre-stressed FRP Strips[C]//TRIANTAFILLOU T.The Eighth International Symposium on FRP Reinforcement for Concrete Structures.Patras:University of Patras,2007:1-10.
[15]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 Zhong-xian,XU Cheng-xiang,JING Meng,et al.Experimental Research on Seismic Behavior of Rein-forced Concrete Short Columns Strengthened withCarbon Fiber Sheets[J].Journal of Building Struc-tures,2002,23(6):41-48.
[16]郭子雄,张杰,杨勇.设置外包预应力钢板箍RC短柱抗震性能研究[J].哈尔滨工业大学学报,2006,38(1):140-144.GUO Zi-xiong,ZHANG Jie,YANG Yong.Study onthe Seismic Performance of RC Column Confined byPrestrssed Steel Plate Hoops[J].Journal of HarbinInstitute of Technology,2006,38(1):140-144.
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