BFRP加固震损混凝土框架节点抗震性能试验研究
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摘要
通过4组三维混凝土框架节点进行模拟地震的预损伤试验、构件加固和加固后的低周反复试验,研究不同受损程度下玄武岩纤维加固后节点的抗震性能.通过对试验现象与相关结果包括极限承载力、极限位移、延性系数、钢筋应变、玄武岩纤维应变、耗散能力等方面进行分析表明,楼板对框架梁抗弯承载力的贡献是不容忽视的.经过玄武岩纤维加固后节点的极限承载力和抗震性能达到并超过未加固时的水平,玄武岩纤维可以提高节点核心区的承载力和黏结滑移性能,在较大荷载下,有效约束混凝土柱的横向膨胀和变形,加固后节点的最终破坏形式由柱端的压弯和节点的剪切破坏转变为梁、板的弯曲破坏,即由"弱柱强梁"转变成了"强柱弱梁"的破坏形式.研究结果表明,玄武岩纤维加固地震灾害后的钢筋混凝土框架节点是合理、有效的.
The experimental study on four repaired C-BJs(column-beam joints) including pre-damage under cyclic loads,rehabilitation and re-test under cyclic loads concentrated on seismic behavior.Through the experimental data,ultimate load-carrying capacity,ultimate displacement,ductility,hysteresis curves and dissipative ability,the following conclusion is drawn: It is indispensable for the load-carrying capacity of frame beams to contribute to slab.The repaired C-BJs can reach or even exceed the level of their ultimate load-carrying capacity and original seismic performance before pre-damage.The load-carrying capacity and bond-slip behaviors can be improved by the BFRP(basalt fiber reinforced polymer) in the repaired C-BJs.Concrete columns can be effectively confined to the expansion and deformation.The failure mode of strong beams and weak columns was changed into strong columns and weak beams after rehabilitations.Based on the experimental results and mechanical analysis,a concept of a reduction coefficient of concrete strength after rehabilitation and the formulas of the calculation method for strength is put forward,which has been reliably verified.The study indicates that the method of BFRP-reinforced pre-damaged concrete column-beam joints is reasonable and effective.
The experimental study on four repaired C-BJs(column-beam joints) including pre-damage under cyclic loads,rehabilitation and re-test under cyclic loads concentrated on seismic behavior.Through the experimental data,ultimate load-carrying capacity,ultimate displacement,ductility,hysteresis curves and dissipative ability,the following conclusion is drawn: It is indispensable for the load-carrying capacity of frame beams to contribute to slab.The repaired C-BJs can reach or even exceed the level of their ultimate load-carrying capacity and original seismic performance before pre-damage.The load-carrying capacity and bond-slip behaviors can be improved by the BFRP(basalt fiber reinforced polymer) in the repaired C-BJs.Concrete columns can be effectively confined to the expansion and deformation.The failure mode of strong beams and weak columns was changed into strong columns and weak beams after rehabilitations.Based on the experimental results and mechanical analysis,a concept of a reduction coefficient of concrete strength after rehabilitation and the formulas of the calculation method for strength is put forward,which has been reliably verified.The study indicates that the method of BFRP-reinforced pre-damaged concrete column-beam joints is reasonable and effective.
引文
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[2]王亚勇.汶川地震建筑震害启示-抗震概念设计[J].建筑结构学报,2008,29(4):20-25.Wang Yayong.Lessons learnt from building damages inthe Wenchuan earthquake-seismic concept design ofbuildings[J].Journal of Building Structures,2008,29(4),20-25.(in Chinese)
[3]唐九如.钢筋混凝土框架节点抗震[M].南京:东南大学出版社,1989.
[4]谢尔盖,李中郢.玄武岩纤维材料的应用前景[J].纤维复合材料,2003,17(3):17-20.Xie Ergai,Li Zhongying.Application prospect of basaltfiber[J].Fiber Composites,2003,17(3):17-20.(inChinese)
[5]胡显奇,罗益峰,申屠年.玄武岩连续纤维及其复合材料[J].高科技纤维与应用,2002,27(2):1-5.Hu Xianqi,Luo Yifeng,Shen Tunian.Basalt continuousfiber and its reinforcing composite material[J].Hi-techFiber&Application,2002,27(2):1-5.(in Chinese)
[6]许淑惠,彭国勋,党新安.玄武岩连续纤维的产业化开发[J].建筑材料学报,2005,8(3):261-267.Xu Shuhui,Peng Guoxun,Dang Xinan.Industrializa-tion development of the continuous basalt fiber[J].Journal of Building Materials,2005,8(3):261-267.(in Chinese)
[7]Sim J,Park C,Moon D Y.Characteristics of basalt fi-ber as a strengthening material for concrete structures[J].Composites Part B Engineering,2005,36:504-512.
[8]吴刚,魏洋,吴智深,等.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,Wei Yang,Wu Zhishen,et al.Comparativestudy on seismic performance of rectangular concretecolumns strengthened with BFRP and CFRP composites[J].Industrial Construction,2007,37(6):14-18.(inChinese)
[9]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 Dongsheng,Wu Zhishen,et al.Compar-ative study on seismic performance of circular concretecolumns strengthened with BFRP and CFRP composites[J].Industrial Construction,2007,37(6):19-23.(in Chinese)
[10]朱伯龙,陆洲导,吴虎南.房屋结构灾害检测与加固[M].上海:同济大学出版社,1995.
[11]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 Weijun.An experimental study on theseismic behavior of beam-column joints strengthenedwith carbon fiber sheets[J].China Civil EngineeringJournal,2005,38(4):60-65.(in Chinese)
[12]洪涛.碳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,2002.
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