摘要
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。
The aseismic behavior of damaged reinforced concrete(RC) shear wall repaired with the engineered cementitious composite(ECC) was studied by a pseudo-static test. The shear wall was tested by an initial pseudo-static test to severe damage in a shear mode with crushing of concrete, yielding and fracture of a steel bar, then repaired with ECC and retested. The response of the RC shear wall in the twice pseudo-static tests was compared to evaluate the followings, such as the efficiency of repairing a damaged RC shear wall with ECC in term of a failure mode, the bearing capacity, the displacement ductility, the energy dissipation, the stiffness degradation and the utilization of a steel bar. The test results indicate that: a. the bearing capacity of a shear wall is restored; b. on the premise of assuring bearing capacity, the ductility of a shear wall is improved, and the failure mode is changed from brittle failure into ductile failure; c. the energy dissipation capacity is also enhanced; d. rely on the good coordination between ECC and a steel bar, the crushing of concrete and buckling of a steel bar is avoided, and the utilization of a steel bar is improved.
出处
《工程力学》
EI
CSCD
北大核心
2015年第1期72-80,共9页
Engineering Mechanics
基金
国家自然科学基金项目(51478362)
