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.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第3期559-564,共6页
Journal of Southeast University：Natural Science Edition
基金
土木工程防灾国家重点实验室基金资助项目(SLDRCE09-D-02)
国家自然科学基金资助项目(50778134)
高等学校博士学科点专项科研基金资助项目(200802471089)
关键词
地震损伤
玄武岩纤维
抗震性能
三维框架节点
计算分析
seismic damage
basalt fiber reinforced polymer
seismic performance
3D beam-column joint
calculation analysis
