预应力碳纤维条带加固高轴压比混凝土圆柱抗震性能试验研究
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摘要
为了研究预应力碳纤维条带加固高轴压比混凝土圆柱的抗震性能,进行了7个钢筋混凝土圆柱试件的低周反复荷载试验,其中1个为设计轴压比0.82的未加固对比柱试件,另外6个为不同高轴压比下的预应力碳纤维条带加固柱试件,主要考虑了环向预应力和轴压比两种参数对加固柱抗震性能的影响。研究结果表明:采用预应力碳纤维条带加固高轴压比混凝土圆柱后,其承载力、延性性能、耗能能力均有大幅度提升;预应力纤维条带提供的环向主动约束力能够有效抑制斜向剪切裂缝的开展,加固后高轴压比圆柱呈现出弯曲破坏特征;采用试验数据回归分析方法,得到了预应力碳纤维条带加固混凝土圆柱极限荷载点位移Δm计算式,计算结果与试验结果吻合较好。
To study seismic behavior of circular RC columns strengthened with pre-stressed CFRP belts under high axial compression,seven circular RC columns including one contrast column under 0.82 axial load ratio and six columns strengthened with pre-stressed CFRP belts were tested with the main experimental parameters being the prestressing level of CFRP belts and axial load ratio.Test results show that the strength,ductility and energy dissipating capacity of the columns with high axial load ratio are improved significantly after being strengthened with pre-stressed CFRP belts.The diagonal shear cracks of columns can be effectively confining with the active lateral confining stress provided by pre-stressed CFRP belts,and the failure mechanism of the columns with high axial load ratio may show more feature of flexure with satisfactory ductility.Using statistic regression analysis,the formula of displacement Δm of the peak loading point is proposed and the result of the model shows good agreement with the test result.
To study seismic behavior of circular RC columns strengthened with pre-stressed CFRP belts under high axial compression,seven circular RC columns including one contrast column under 0.82 axial load ratio and six columns strengthened with pre-stressed CFRP belts were tested with the main experimental parameters being the prestressing level of CFRP belts and axial load ratio.Test results show that the strength,ductility and energy dissipating capacity of the columns with high axial load ratio are improved significantly after being strengthened with pre-stressed CFRP belts.The diagonal shear cracks of columns can be effectively confining with the active lateral confining stress provided by pre-stressed CFRP belts,and the failure mechanism of the columns with high axial load ratio may show more feature of flexure with satisfactory ductility.Using statistic regression analysis,the formula of displacement Δm of the peak loading point is proposed and the result of the model shows good agreement with the test result.
引文
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[2]薛彦涛,黄世敏,姚秋来,等.汶川地震钢筋混凝土框架结构震害及对策[J].工程抗震与加固改造,2009,31(5):93-100.(Xue Yantao,Huang Shimin,Yao Qiulai,et al.Seismic damage and design conceptfrom the buildings of RC frame structure in Wenchuanearthquake[J].Earthquake Resistant Engineering andRetrofitting,2009,31(5):93-100.(in Chinese))
[3]霍林生,李宏男,肖诗云,等.汶川地震钢筋混凝土框架结构震害调查与启示[J].大连理工大学学报,2009,49(5):718-723.(HUO Linsheng,LI Hongnan,XIAO Shiyun,et al.Earthquake damage investigationand analysis of reinforced concrete frame structures inWenchuan earthquake[J].Journal of Dalian Universityof Technology,2009,49(5):718-723.(in Chinese))
[4]CECS146:2003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.(CECS146:2003 Technical specification for strengtheningconcrete structures with carbon fiber reinforce a polymerlaninate[S].Beijing:China Planning Press,2003.(inChinese))
[5]飞渭,江世永,曾祥蓉.体外预应力FRP片材加固混凝土结构的研究现状及发展[J].后勤工程学院学报,2006,22(4):12-16.(FEI Wei,JIANG Shiyong,ZENG Xiangrong.Experimental research on seismicbehavior of reinforced concrete columns strengthenedwith carbon fiber sheets[J].Journal of LogisticalEngineering University,2006,22(4):12-16.(inChinese))
[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 Changdong,ZHAO Feng,ZHANG Airong,et al.The mechanical behavior ofconcrete pier strengthened with lateral pre-stressed FRPsheets[J].Industrial Construction,2009,39(4):124-127.(in Chinese))
[7]Pantelides C P,Gergelv J,Reaveley L D,et al.Retrofit of RC bridge pier with CFRP advancedcomposites[J].Journal of Structural Engineering,ASCE,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 Y W,Kooroush N N,Hajime S.Seismic oremergency retrofit of RC short columns by use ofprestressed aramid fiber belts as external hoops[R].Tokyo:Architectural Institute of Japan,2001:135-141.
[10]Nesheli K,Meguro K.Seismic retrofitting ofeartherquake-damaged concrete columns by lateralpretensioning of FRP belts[R].San Francisco,USA:National Conference on Earthquake Engineering,2006.
[11]Shahab M T,Hasan M.Experimental and analyticalinvestigation of square RC columns retrofitted with pre-stressed FRP strips[C/CD]//8th InternationalSymposium on FRP Reinforcement for ConcreteStructures.Greece:Patras,2007.
[12]郭子雄,张杰,李传林.预应力钢板箍加固高轴压比框架柱抗震性能研究[J].土木工程学报,2009,42(12):112-117.(GUO Zixiong,ZHANG Jie,LIChuanlin.Seismic strengthening of rectangular RCcolumns using prestressing steel jackets[J].ChinaCivil Engineering Journal,2009,42(12):112-117.(inChinese))
[13]张国军,吕西林,刘伯权.高强混凝土框架柱的恢复力模型研究[J].工程力学,2007,24(3):83-90.(ZHANG Guojun,LU Xilin,LIU Boquan.Study onresilience models of high-strength concrete framecolumns[J].Engineering Mechanics,2007,24(3):83-90.(in Chinese))
[14]郭子雄,张志伟,黄群贤,等.型钢混凝土柱恢复力模型试验研究[J].地震工程与工程振动,2009,29(5):79-85.(GUO Zixiong,ZHANG Zhiwei,HUANGQunxian,et al.Experimental study on hysteretic modelof SRC columns[J].Journal of Earthquak Engineeringand Engineering Vibration,2009,29(5):79-85.(inChinese))
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