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该文采用拟静力试验研究了采用高延性纤维增强水泥基复合材料(ECC)修复后的震损钢筋混凝土剪力墙的抗震性能。先对剪力墙进行了初次拟静力试验,剪力墙呈现剪切破坏,混凝土压溃,脚部钢筋压弯、屈服甚至断裂,然后采用ECC对震损的钢筋混凝土剪力墙进行了修复,随后进行了再次拟静力试验。通过对比分析前后两次试验结果,从剪力墙破坏模式、承载能力、延性、耗能能力、刚度退化、钢筋效用发挥等方面的差异,综合评价ECC用于修复震损剪力墙的有效性。试验结果表明:a)剪力墙的承载能力基本得到恢复;b)在保证承载能力的前提下,剪力墙的延性得到提高,改变剪力墙的破坏模式,由脆性破坏转化为延性破坏;c)提高墙体的耗能能力;d)避免剪力墙墙脚混凝土的压溃和钢筋的屈曲,依靠ECC与钢筋良好的变形协调性,提高脚部钢筋的利用率。
In this paper, the quasi-static test was used to study the seismic behavior of a reinforced concrete shear wall after repaired by high ductility fiber reinforced cement-based composites (ECC). The first quasi-static test of the shear wall was carried out first, the shear wall was sheared and damaged, the concrete was crushed, the leg steel was bent, yield and even fractured, and then the reinforced RC shear wall was repaired by ECC , Followed by a second quasi-static test. By comparing the results of two tests before and after, the validity of ECC for repairing earthquake-damaged shear walls is evaluated synthetically from the differences of failure modes, bearing capacity, ductility, energy dissipation capacity, stiffness degradation and reinforcement effectiveness of shear walls. . The results show that: a) the bearing capacity of the shear wall has basically been restored; b) the ductility of the shear wall is improved under the premise of ensuring the bearing capacity; the failure mode of the shear wall is changed from brittle failure to ductile failure; c) to improve the energy dissipation capacity of the wall; d) to avoid the crushing of the shear wall concrete and the buckling of the rebar, and to rely on the good deformation compatibility between the ECC and the rebar to improve the utilization of the leg rebar.