玄武岩纤维加固震损混凝土框架节点的抗震性能
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摘要
基于三维钢筋混凝土框架节点试验(包括施加低周反复荷载预震损、灌缝修复处理、运用玄武岩纤维加固和施加低周反复荷载至节点破坏试验),研究玄武岩纤维对震损钢筋混凝土框架节点的加固效果。根据试验现象和试验数据,对不同三维框架节点的破坏模式、滞回曲线、骨架曲线、极限承载力、延性系数以及节点表面的玄武岩纤维的应变等参数进行对比分析。研究结果表明:运用玄武岩纤维加固的三维钢筋混凝土框架节点均实现了"强柱弱梁"的设计目标,破坏形态均为梁弯曲破坏形式,加固后节点的滞回曲线饱满,极限承载力和位移延性系数均有所提高,节点的抗震性能得到很大提高。
Based on the test of repaired column-beam joints(C-BJs) pre-damaged under low cycle reversed loading,seismic performance of the C-BJs strengthened with basalt fiber sheets was studied.The test procedures included pre-damage,rehabilitation,reinforcement with basalt fiber sheets and re-test under low cycle reversed loading.According to the test phenomena and test data,the failure modes,hysteresis curves,skeleton curves,ultimate bearing capacity,ductility and the strain of the basalt fiber sheets of different C-BJs were compared and analyzed.The test results show that the C-BJs strengthened with basalt fiber sheets exhibit strong column-weak beam failure mechanism.All connections fail due to the concrete crushing and rupture of longitudinal bars as a result of plastic hinges at the fixed beam end.The hysteretic curves of the C-BJs strengthened with basalt fiber sheets are full and show better energy dissipation.The reinforcement with basalt fiber sheets has a significant effect on increasing the ultimate bearing capacity and improving the displacement ductility and the seismic behaviors of the C-BJs.
Based on the test of repaired column-beam joints(C-BJs) pre-damaged under low cycle reversed loading,seismic performance of the C-BJs strengthened with basalt fiber sheets was studied.The test procedures included pre-damage,rehabilitation,reinforcement with basalt fiber sheets and re-test under low cycle reversed loading.According to the test phenomena and test data,the failure modes,hysteresis curves,skeleton curves,ultimate bearing capacity,ductility and the strain of the basalt fiber sheets of different C-BJs were compared and analyzed.The test results show that the C-BJs strengthened with basalt fiber sheets exhibit strong column-weak beam failure mechanism.All connections fail due to the concrete crushing and rupture of longitudinal bars as a result of plastic hinges at the fixed beam end.The hysteretic curves of the C-BJs strengthened with basalt fiber sheets are full and show better energy dissipation.The reinforcement with basalt fiber sheets has a significant effect on increasing the ultimate bearing capacity and improving the displacement ductility and the seismic behaviors of the C-BJs.
引文
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[8]Adin M A,Yankelevsky D Z,Farhey D N.Cyclic behavior ofepoxy repaired reinforced concrete beam-column joints[J].StructJ ACI,1993,90(2):170?179.
[9]吴波,王维俊.碳纤维布加固钢筋混凝土框架节点的抗震性能试验研究[J].土木工程学报,2005,38(4):60?65.WU Bo,WANG Wei-jun.An experimental study on the seismicbehavior of beam-column joints strengthened with carbon fibersheets[J].Chinese Civil Engineering Journal,2005,38(4):60?65.
[10]Mukherjee A,Joshi M.FRPC reinforced concrete beam-columnjoints under cyclic excitation[J].Composite Structures,2005,70(9):185?199.
[11]Parvin A,WU Shan-hong.Ply angle effect on fiber compositewrapped reinforced concrete beam-column connections undercombined axial and cyclic loads[J].Composite Structures,2008,82(2):532?538.
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[13]刘建伟.空间RC框架夹心节点与传统节点抗震性能对比试验[J].工业建筑,2009,39(2):88?93.LIU Jian-wei.Comparison of aseismic behavior of traditionaland sandwich space RC beam-column joints based on cyclic loadtest[J].Industrial Construction,2009,39(2):88?93.
[2]程莉.玄武岩纤维加固震损混凝土框架节点抗震性能试验研究[D].上海:同济大学土木工程学院,2008:10?13.CHENG Li.Investigation of BFRP-reinforced pre-damagedconcrete beam-column joints under reversed cyclic loading[D].Shanghai:Tongji University.College of Civil Engineering,2008:10?13.
[3]齐凤杰,李锦文,李传校,等.连续玄武岩纤维研究综述[J].高科技纤维与应用,2006,31(2):41?46.QI Feng-jie,LI Jin-wen,LI Chuan-xiao,et al.Summary on theresearch of continuous basalt fibre[J].Hi-tech Fiber&Application,2006,31(2):41?46.
[4]欧阳煜,王鹏,张云超.玄武岩纤维布加固钢筋混凝土梁受弯受剪承载力计算分析[J].工业建筑,2007,37(6):24?27.OUYANG Yu,WANG Peng,ZHANG Yun-chao.Calculation andanalysis of flexural and shear capacity of RC beams strengthenwith BFRP sheets[J].Industrial Construction,2007,37(6):24?27.
[5]吴刚.玄武岩纤维与碳纤维加固混凝土矩形柱抗震性能比较研究[J].工业建筑,2007,37(6):14?18.WU Gang.Comparative study on seismic performance ofrectangular concrete columns strengthened with BFRP andCFRP composites[J].Industrial Construction,2007,37(6):14?18.
[6]吴刚.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.Comparative study on seismic performance ofcircular concrete columns strengthened with BFRP and CFRPcomposites[J].Industrial Construction,2007,37(6):19?23.
[7]吴刚.连续玄武岩纤维在墩柱抗震加固中的应用研究[C]//全国FRP与结构加固学术会议.2005:205?211.WU Gang.Research on seismic retrofit of reinforcementconcrete bridge columns using continuous basalt fiber[C]//National Conference on FRP Reinforcement and Structure.2005:205?211.
[8]Adin M A,Yankelevsky D Z,Farhey D N.Cyclic behavior ofepoxy repaired reinforced concrete beam-column joints[J].StructJ ACI,1993,90(2):170?179.
[9]吴波,王维俊.碳纤维布加固钢筋混凝土框架节点的抗震性能试验研究[J].土木工程学报,2005,38(4):60?65.WU Bo,WANG Wei-jun.An experimental study on the seismicbehavior of beam-column joints strengthened with carbon fibersheets[J].Chinese Civil Engineering Journal,2005,38(4):60?65.
[10]Mukherjee A,Joshi M.FRPC reinforced concrete beam-columnjoints under cyclic excitation[J].Composite Structures,2005,70(9):185?199.
[11]Parvin A,WU Shan-hong.Ply angle effect on fiber compositewrapped reinforced concrete beam-column connections undercombined axial and cyclic loads[J].Composite Structures,2008,82(2):532?538.
[12]葛萧,张华.混凝土框架节点抗震性能研究综述[J].山西建筑,2008,34(22):99?100.GE Xiao,ZHANG Hua.Study on anti-shake capability ofconcrete frame nodes[J].Shanxi Architecture,2008,34(22):99?100.
[13]刘建伟.空间RC框架夹心节点与传统节点抗震性能对比试验[J].工业建筑,2009,39(2):88?93.LIU Jian-wei.Comparison of aseismic behavior of traditionaland sandwich space RC beam-column joints based on cyclic loadtest[J].Industrial Construction,2009,39(2):88?93.
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