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通过对3根模型比为1/2的钢筋混凝土框架柱试件在低周水平往复荷载作用下的抗震试验,研究喷射混杂玄武岩-碳纤维增强复合材料加固震损钢筋混凝土框架柱的抗震性能及加固效果。试验结果表明:震损至纵筋屈服的框架柱经喷射加固后,其极限承载力基本可恢复到震损前框架柱的极限承载力,位移延性系数和循环累积耗能则分别提高了7.43%和22%,且软化阶段刚度退化速度明显慢于未加固框架柱。震损至极限破坏的框架柱经喷射加固后,其峰值荷载和循环累积耗能分别降低了11.9%和39%,而位移延性系数略有提高;虽然因预损程度严重,其初始刚度明显低于未加固框架柱和震损屈服后加固框架柱,但因喷射纤维增强材料FRP加固层的拉结约束作用,其刚度退化速度仍能与未加固框架柱和震损屈服后加固框架柱基本持平。喷射混杂纤维复合材料可以有效恢复甚至改善震损框架柱的抗震性能,抗震加固效果良好。喷射加固方法可以对地震区已震损框架柱进行快速加固,有效防止框架结构在地震余震中发生倒塌等严重破坏。
Seismic tests on three RC frame columns with a model ratio of 1/2 were carried out under horizontal cyclic reciprocating loads to study the seismic behavior and reinforcement of framed reinforced concrete columns with jet-mixed basalt-carbon fiber reinforced composites effect. The experimental results show that the ultimate bearing capacity of the frame post which is subjected to the longitudinal reinforcement yielding can be restored to the ultimate bearing capacity, the displacement ductility coefficient and cyclic cumulative energy consumption increase by 7.43% And 22%, respectively, and the rate of stiffness degradation in the softening stage was significantly slower than that of the unreinforced frame columns. The peak load and cyclic cumulative energy loss decreased by 11.9% and 39%, respectively, while the displacement ductility coefficient increased slightly. However, the initial stiffness was significantly lower due to the severe damage degree However, due to the restraining effect of FRP reinforcement layer of sprayed fiber reinforcement, the stiffness degradation rate can still be basically the same as that of the un-reinforced frame column and the post-earthquake reinforced yielding frame column . Jet hybrid fiber composite materials can effectively restore or even improve the seismic performance of damaged frame columns, and the seismic strengthening effect is good. The jet-reinforcement method can rapidly reinforce the damaged frame columns in the earthquake area and effectively prevent the frame structure from being seriously damaged during the earthquake aftershocks.