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为研究底部加强型钢管混凝土边框带钢筋暗撑混凝土组合剪力墙抗震性能及损伤后性能,对普通型和底部加强型试件进行了两阶段低周反复荷载试验,第1阶段试验加载至位移角1/50停止,试件明显屈服损伤,卸载至水平位移恢复初始位置后,进行第2阶段低周反复荷载试验,直至试件严重破坏。分析了各试件的破坏特征、滞回特性、承载力、刚度退化、延性、耗能和应变,给出了承载力简化计算式。研究表明:混凝土墙体未损伤时,底部加强型组合剪力墙较普通型组合剪力墙损伤较轻,承载力提高了8.6%,其他性能接近;混凝土墙体有较大损伤后,底部加强型组合剪力墙剩余承载力高,变形能力大,耗能能力强,抗震性能退化相对较慢,具有较好的抗倒塌能力;给出的承载力计算式可较好的预测其承载力。
In order to study the seismic performance and post-damage performance of reinforced concrete composite shear wall with reinforced concrete filled steel tubular column (CFST) frame at bottom, two-stage low-cycle cyclic loading test was carried out for ordinary and bottom strengthened specimens. The first-stage test was loaded to displacement 1/50 stop, the specimen obviously yielding damage, unloading to the initial position of the horizontal displacement recovery, the second stage low cycle repeated load test until the specimen was severely damaged. The failure characteristics, hysteretic characteristics, bearing capacity, stiffness degradation, ductility, energy dissipation and strain of each specimen are analyzed. A simplified calculation formula of bearing capacity is given. The results show that when the concrete wall is not damaged, the bottom reinforced composite shear wall is less damaged than the common composite shear wall, the bearing capacity is increased by 8.6%, and the other properties are close. After the concrete wall has greater damage, the bottom reinforces The combined shear wall has high residual capacity, large deformation capacity, strong energy dissipation capacity and relatively slow degradation of seismic performance, and has good ability of resisting collapse. The calculated bearing capacity formula can predict the bearing capacity better.