CFRP加固高强混凝土方柱的延性性能试验分析与计算
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摘要
为了研究碳纤维增强复合材料(CFRP)加固高强混凝土方柱的抗震性能,对13个高强混凝土方柱进行低周反复荷载试验,研究了试件破坏形态、滞回特性、骨架曲线、耗能能力和延性等抗震性能,探讨了轴压比、剪跨比、CFRP加固量对高强混凝土方柱延性性能的影响,给出了计算CFRP布有效约束系数和位移延性系数的公式。结果表明:随着轴压比增大、剪跨比减小,试件耗能能力和延性降低;横向包裹CFRP布可以显著改善高强混凝土方柱耗能能力和延性;与未加固试件相比,横向包裹CFRP布对轴压比较大或剪跨比较小试件的延性提高效果更为显著;随着加固量的增加,试件的耗能能力和延性增大,但增加幅度逐渐降低。
To investigate the seismic behaviors of high-strength reinforced concrete(RC) square columns strengthened with carbon fiber reinforced polymer(CFRP),the low cyclic loading test of thirteen high-strength RC square columns was conducted.The seismic behaviors of columns,such as failure patterns,hysteresis behaviors,skeleton curves,energy dissipation capacity and ductility were studied,and the influences of axial load ratio,shear span ratio and CFRP strengthening volume on the ductility of high-strength RC square columns were discussed.The calculation formulae of CFRP effective constraint coefficient and displacement ductility coefficient were proposed.Results show that the ductility and energy dissipation capacity can be significantly reduced as the increase of axial load ratios or the decrease of shear span ratios;CFRP can observably improve the ductility and energy dissipation capacity of high-strength RC square columns;compared with the columns without CFRP,the seismic behaviors of columns with high axial load ratio or low shear span ratio are improved more obviously after being strengthened with CFRP in transverse;and the ductility,energy dissipation capacity increase with the increases of strengthening volume,but the improvement extent reduces gradually.
To investigate the seismic behaviors of high-strength reinforced concrete(RC) square columns strengthened with carbon fiber reinforced polymer(CFRP),the low cyclic loading test of thirteen high-strength RC square columns was conducted.The seismic behaviors of columns,such as failure patterns,hysteresis behaviors,skeleton curves,energy dissipation capacity and ductility were studied,and the influences of axial load ratio,shear span ratio and CFRP strengthening volume on the ductility of high-strength RC square columns were discussed.The calculation formulae of CFRP effective constraint coefficient and displacement ductility coefficient were proposed.Results show that the ductility and energy dissipation capacity can be significantly reduced as the increase of axial load ratios or the decrease of shear span ratios;CFRP can observably improve the ductility and energy dissipation capacity of high-strength RC square columns;compared with the columns without CFRP,the seismic behaviors of columns with high axial load ratio or low shear span ratio are improved more obviously after being strengthened with CFRP in transverse;and the ductility,energy dissipation capacity increase with the increases of strengthening volume,but the improvement extent reduces gradually.
引文
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[17]邬晓光,张柳煜,郝毅,等.碳纤维加固钢筋混凝土梁的受弯全过程分析[J].长安大学学报:自然科学版,2008,28(2):53-57.WU Xiao-guang,ZHANG Liu-yu,HAO Yi,et al.Flex-ural-tensile Strength of Concrete Beams in CompleteCourse of Reinforcement with Carbon-fiber-reinforced-polymer(CFRP)[J].Journal of Chang'an University:Natural Science Edition,2008,28(2):53-57.
[18]张柳煜,邬晓光,李启乾.粘贴加固材料厚度与钢筋混凝土T梁极限承载力分析[J].筑路机械与施工机械化,2010,27(7):67-69.ZHANG Liu-yu,WU Xiao-guang,LI Qi-qian.Analysis onThickness of Reinforcement Material and Ultimate Bear-ing Capacity of RC T-section Beams Strengthened withSteel Plate and CFRP[J].Road Machinery&Construc-tion Mechanization,2010,27(7):67-69.
[19]陈小英,李唐宁,黄音,等.CFRP体外预应力加固钢筋混凝土T型梁试验[J].中国公路学报,2010,23(2):56-63.CHEN Xiao-ying,LI Tang-ning,HUANG Yin,et al.Ex-periment on Reinforced Concrete T-beams Strengthenedwith External Prestressed CFRP Sheets[J].China Jour-nal of Highway and Transport,2010,23(2):56-63.
[2]ANGGAWIDJAJA D,UEDA T,DAI J,et al.DeformationCapacity of RC Piers Wrapped by New Fiber-reinforcedPolymer with Large Fracture Strain[J].Cement and Con-crete Composites,2006,28(10):914-927.
[3]WU G,LU Z T,WU Z S.Strength and Ductility of Con-crete Cylinders Confined with FRP Composites[J].Con-struction and Building Materials,2006,20(3):134-148.
[4]王吉忠,王苏岩,黄承逵.CFRP加固高强混凝土柱抗震性能和延性研究[J].大连理工大学学报,2008,48(5):708-714.WANG Ji-zhong,WANG Su-yan,HUANG Cheng-kui.Research on Ductility and Earthquake-resistance of HighStrength Concrete Column Confined by CFRP[J].Jour-nal of Dalian University of Technology,2008,48(5):708-714.
[5]王苏岩,韩克双,曲秀华.CFRP加固高强混凝土柱改善延性的试验研究[J].世界地震工程,2005,21(3):7-10.WANG Su-yan,HAN Ke-shuang,QU Xiu-hua.Experi-mental Research on Ductility Behavior of High-strengthReinforced Concrete Columns Strengthened with CarbonFiber Sheets[J].World Earthquake Engineering,2005,21(3):7-10.
[6]SEIBLE F,PRIESTLEY M J N,HEGEMIER G A,et al.Seismic Retrofit of RC Columns with Continuous CarbonFiber Jackets[J].Journal of Composite for Construction,1997,1(2):52-62.
[7]XIAO Y,MA R.Seismic Retrofit of RC Circular ColumnsUsing Prefabricated Composite Jacketing[J].Journal ofStructure Engineering,1997,123(10):1357-1364.
[8]闫长旺.钢骨超高强混凝土框架节点抗震性能研究[D].大连:大连理工大学,2009.YAN Chang-wang.Study on Seismic Performance of SteelReinforced Ultra High Strength Concrete Frame Connec-tion[D].Dalian:Dalian University of Technology,2009.
[9]刘伯权,白国良,张国军.高轴压比高强混凝土框架柱抗震性能试验研究[J].土木工程学报,2005,38(1):45-50.LIU Bo-quan,BAI Guo-liang,ZHANG Guo-jun.An Ex-perimental Study on the Seismic Behavior of HighStrength Reinforced Concrete Frame Columns with HighAxial Compression Ratio[J].China Civil Engin-eeringJournal,2005,38(1):45-50.
[10]赵鹏展.GFRP管混凝土柱-钢筋混凝土梁节点抗震性能研究[D].大连:大连理工大学,2010.ZHAO Peng-zhan.Study on Seismic Performance of Con-crete-filled GFRP Tubes Column-reinforced ConcreteBeam Joint[D].Dalian:Dalian University of Technolo-gy,2010.
[11]李凤兰,黄承逵,温世臣,等.低周反复荷载下钢纤维高强混凝土柱延性试验研究[J].工程力学,2005,22(6):159-164.LI Feng-lan,HUANG Cheng-kui,WEN Shi-chen,et al.Ductility of Steel Fiber Reinforced High-strength Con-crete Columns Under Cycle Loading[J].EngineeringMechanics,2005,22(6):159-164.
[12]张轲,岳清瑞,叶列平.碳纤维布加固钢筋混凝土柱滞回耗能分析及目标延性系数确定[J].工业建筑,2001,31(6):5-8.ZHANG Ke,YUE Qing-rui,YE Lie-ping.Analysis ofHystersis Energy Disspation and Acceptable DuctilityFactor for Concrete Column Strengthened with CFS[J].Industrial Construction,2001,31(6):5-8.
[13]叶列平,赵树红,李全旺,等.碳纤维布加固混凝土柱受剪承载力计算[J].建筑结构学报,2000,21(2):59-67.YE Lie-ping,ZHAO Shu-hong,LI Quan-wang,et al.Cal-culation of Shear Strength of Concrete Column Strength-ened with Carbon Fiber Reinforced Plastic Sheet[J].Journal of Building Structures,2000,21(2):59-67.
[14]李春良,程永春,何峰.预应力碳纤维布加固钢筋混凝土梁的经典层合理论力学解析[J].中国公路学报,2009,22(1):60-65.LI Chun-liang,CHENG Yong-chun,HE Feng.TheoreticalStudy of RC Beam Strengthened with Prestressed CFRPSheet Based on Classical Laminate Theory[J].ChinaJournal of Highway and Transport,2009,22(1):60-65.
[15]薛伟辰,钱卫.部分预应力CFRP筋混凝土梁疲劳性能研究[J].中国公路学报,2008,21(2):43-48.XUE Wei-chen,QIAN Wei.Study of Fatigue Behaviors ofPartially Prestressed Concrete Beams with CFRP Tendons[J].China Journal of Highway and Transport,2008,21(2):43-48.
[16]方志,李红芳,彭波.体外CFRP预应力筋混凝土梁的受力性能[J].中国公路学报,2008,21(3):40-47.FANG Zhi,LI Hong-fang,PENG Bo.Mechanical Behav-iors of Concrete Beam of External Prestressed CFRP Ten-dons[J].China Journal of Highway and Transport,2008,21(3):40-47.
[17]邬晓光,张柳煜,郝毅,等.碳纤维加固钢筋混凝土梁的受弯全过程分析[J].长安大学学报:自然科学版,2008,28(2):53-57.WU Xiao-guang,ZHANG Liu-yu,HAO Yi,et al.Flex-ural-tensile Strength of Concrete Beams in CompleteCourse of Reinforcement with Carbon-fiber-reinforced-polymer(CFRP)[J].Journal of Chang'an University:Natural Science Edition,2008,28(2):53-57.
[18]张柳煜,邬晓光,李启乾.粘贴加固材料厚度与钢筋混凝土T梁极限承载力分析[J].筑路机械与施工机械化,2010,27(7):67-69.ZHANG Liu-yu,WU Xiao-guang,LI Qi-qian.Analysis onThickness of Reinforcement Material and Ultimate Bear-ing Capacity of RC T-section Beams Strengthened withSteel Plate and CFRP[J].Road Machinery&Construc-tion Mechanization,2010,27(7):67-69.
[19]陈小英,李唐宁,黄音,等.CFRP体外预应力加固钢筋混凝土T型梁试验[J].中国公路学报,2010,23(2):56-63.CHEN Xiao-ying,LI Tang-ning,HUANG Yin,et al.Ex-periment on Reinforced Concrete T-beams Strengthenedwith External Prestressed CFRP Sheets[J].China Jour-nal of Highway and Transport,2010,23(2):56-63.
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