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采用增量动力分析方法,考虑3种不同的纤维增强复合材料(FRP)加固方案,对低多层非延性钢筋混凝土框架结构在FRP加固前后的地震倒塌易损性进行了分析。结果表明:整体加固方案可以有效提高非延性钢筋混凝土框架结构的抗地震倒塌能力;采用底层加固方案会使结构的薄弱层上移,不能提高结构的抗地震倒塌能力,反而降低了结构的地震倒塌安全裕度;随着非延性钢筋混凝土框架结构高度的增加,FRP的加固效果逐渐减弱。
Using incremental dynamic analysis method, three kinds of FRP reinforcement schemes are considered to analyze the vulnerability of low multi-story non-ductile RC frame before and after FRP reinforcement. The results show that the overall reinforcement scheme can effectively improve the anti-seismic collapse capability of non-ductile RC frame structures. The use of the bottom reinforcement scheme will cause the weak layer of the structure to move upwards, which will not increase the anti-seismic collapse capability of the structure, but will reduce the structural collapse Safety margin; With the non-ductile reinforced concrete frame structure height increases, FRP reinforcement effect gradually weakened.