预应力纤维条带加固震损混凝土圆墩抗震性能试验研究
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摘要
通过12根钢筋混凝土圆墩柱(其中对比柱1根,震损柱3根)在低周反复荷载作用下的试验研究,分析预应力纤维条带加固钢筋混凝土圆墩柱的抗震性能。考虑的主要因素包括:预应力大小、预损程度、纤维种类、表面处理方式。根据试件的破坏形态和滞回曲线,分析各因素对承载力、位移延性、滞回性能、耗能能力等重要抗震性能指标的影响。试验结果表明:采用预应力碳纤维条带加固震损圆墩柱后,震损柱的承载力、延性性能、耗能能力均可在一定程度内得到恢复与提高。对柱体表面打磨、纤维布刷胶之后,再进行预应力0.2碳纤维条带加固的试件抗震性能得到最大程度改善。实际工程抗震加固时应优先选用预应力碳纤维条带,并尽量避免使用预应力玄武岩纤维条带。
Twelve RC cylinder piers including one contrast column and three pre-damaged piers were tested under cyclic lateral loading and constant axial loading to study the seismic-resistance behavior of reinforced concrete piers retrofitted with pre-stressed FRP belts mainly in respect of the experimental parameters such as the prestressing level of FRP belts,pre-damage level,type of FRP and surface treatment.The influence of each parameter on the bearing capacity,displacement ductility,hysteretic behavior and energy dissipating capacity was analyzed by the main failure patterns and hysteretic curves of the specimens.Test results show as follows: The bearing capacity,displacement ductilily and energy dissipating capacity of the retrofitted pre-damaged piers are improved to a certain extent;with polished and glued surface treatment,the specimen strengthened with 0.2 prestressed CFRP belts gets the greatest degree of improvement in seismic performance;the seismic-resistance behavior of the reinforced concrete pier strengthened with pre-stressed BFRP belts is far worse than that of those piers strengthened with CFRP belts;the pre-stressed CFRP belts can be used to improve the seismic behavior of RC cylinder piers in practice;on the contrary,the pre-stressed BFRP belts should be avoided as best as possible in engineering practice.
Twelve RC cylinder piers including one contrast column and three pre-damaged piers were tested under cyclic lateral loading and constant axial loading to study the seismic-resistance behavior of reinforced concrete piers retrofitted with pre-stressed FRP belts mainly in respect of the experimental parameters such as the prestressing level of FRP belts,pre-damage level,type of FRP and surface treatment.The influence of each parameter on the bearing capacity,displacement ductility,hysteretic behavior and energy dissipating capacity was analyzed by the main failure patterns and hysteretic curves of the specimens.Test results show as follows: The bearing capacity,displacement ductilily and energy dissipating capacity of the retrofitted pre-damaged piers are improved to a certain extent;with polished and glued surface treatment,the specimen strengthened with 0.2 prestressed CFRP belts gets the greatest degree of improvement in seismic performance;the seismic-resistance behavior of the reinforced concrete pier strengthened with pre-stressed BFRP belts is far worse than that of those piers strengthened with CFRP belts;the pre-stressed CFRP belts can be used to improve the seismic behavior of RC cylinder piers in practice;on the contrary,the pre-stressed BFRP belts should be avoided as best as possible in engineering practice.
引文
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[2]刘金龙,周文松,唐勇章,等.汶川地震中广元市桥梁结构地震破坏情况调查与分析[J].工程抗震与加固改造,2010,32(4):119-124.LIU Jin-long,ZHOU Wen-song,TANG Yong-zhang,etal.Investigation of Bridge Damage in Guangyuan duringWenchuan Earthquake[J].Earthquake Resistant Engineer-ing and Retrofitting,2010,32(4):119-124.
[3]李翔,吕西林,李建中,等.汶川地震中广元市底层框架结构房屋震害调查与分析[J].结构工程师,2008,24(3):12-15.LI Xiang,LXi-lin,LI Jian-zhong,et al.Damage Investi-gaiton and Analysis of Multistory Masonry Buildings Sup-ported by RC Frames in Guangyuan after Wenchuan Earth-quake[J].Structural Engineers,2008.24(3):12-15.
[4]中国工程建设标准化协会.碳纤维片材加固混凝土结构技术规程[S].北京:中国计划出版社,2003.
[5]吴刚,吕志涛,蒋剑彪.碳纤维布加固钢筋混凝土柱抗震性能的试验研究[J].建筑结构,2002,32(10):42-45.WU Gang,LZhi-tao,JIANG Jian-biao.ExperimentalResearch on Seismic Behavior of Reinforced Concrete Col-umns Strengthened with Carbon Fiber Sheets[J].BuildingStructure,2002,32(10):42-45.
[6]周长东,赵锋,张艾荣,等.预应力FRP布加固混凝土桥墩的力学性能研究[J].工业建筑,2009,39(4):124-127.ZHOU Chang-dong,ZHAO Feng,ZHANG Ai-rong,etal.The Mechanical Behavior of Concrete Pier Strengthenedwith Lateral Pre-stressed FRP Sheets[J].Industrial Con-struction,2009,39(4):124-127.
[7]PANTELIDES C P,GERGELV J,REAVELEY L D,etal.Retrofit of RC Bridge Pier with CFRP Advanced Com-posites[J].Journal of Structural Engineering,1999,125(10):1094-1099.
[8]XIAO Y,WU H,Martin G R.Prefabricated CompositeJacketing of RC Columns for Enhanced Shear Strength[J].Journal of Structural Engineering,ASCE,1999,125(3):255-264.
[9]Tetsuo yamaka wa,Kooroush nasrollahzadeh neshell,Hajime satoh.Seismic or Emergency Retrofit of RC ShortColumns by Use of Prestressed Aramid Fiber Belts as Ex-ternal Hoops[J].Architectural Institute of Japan,2001,135-141.
[10]K.Nasrollahzadeh Nesheli.Seismic Retrofitting of Earth-erquake-damaged Concrete Columns by Lateral Pretensio-ning of FRP Belts[C]//U.S.National Conference onEarthquake Engineering.2006.
[11]Shahab mehdizad taleie,Hasan moghaddam.Experimentaland Analytical Investigation of Square RC Columns Retro-fitted with Pre-stressed FRP Strips[C]∥8th InternationalSymposium on FRP Reinforcement for Concrete Structures.Greece:2007.
[12]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 on theSeismic Performance of RC Column Confined by Pres-trssed Steel Plate Hoops[J].Jouranl of Harbin Instituteof Technology,2006,38(1):140-144.
[13]吴刚,顾冬生,吴智深,等.玄武岩纤维与碳纤维加固混凝土圆形柱抗震性能比较研究[J].工业建筑,2007,37(6):19-23.WU Gang,GU Dong-sheng,WU Zhi-shen,et al.ComparativeStudy on Seismic Performance of Circular Concrete Col-umns Strengthened with BFRP and CFRP Composites[J].Industrial Construction,2007,37(6):19-23.
[14]赵根田,曹芙波.CFRP加固钢筋混凝土震损短柱的抗震性能研究[J].工程抗震与加固改造,2010,32(5):85-90.ZHAO Gen-tian,CAO Fu-bo.Seismic Behavior of Rein-forced Concrete Crack-Short Columns Strengthened withCFRP[J].Earthquake Resistant Engineering and Retrofit-ting,2010,32(5):85-90.
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