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通过对1榀单跨二层再生混凝土框架进行低周反复试验,研究其结构的破坏特征、滞回性能、骨架曲线、强度和刚度退化和耗能能力等。同时,利用预先设置在钢筋上的应变片研究和分析再生混凝土框架梁柱中纵筋、箍筋关键点应变在低周反复荷载下的变化规律。试验结果表明,再生混凝土框架梁端、柱脚荷载-曲率滞回曲线较丰满,有良好耗能能力。结构变形为屈服时的3.5倍时,其承载力无明显降低。再生混凝土框架具有良好的抗震性能,应用于工程实际是可行的。
Through the low-cycle repeated test of 1 榀 single span two-story recycled concrete frame, the structural failure characteristics, hysteretic behavior, skeleton curve, strength and stiffness degradation and energy dissipation capacity were studied. At the same time, using the strain gauge pre-set on the steel bar, the variation law of the key point strain of the longitudinal reinforcement and the stirrups in the reclaimed concrete beams and columns under low cyclic loading was studied and analyzed. The test results show that the load-curvature hysteretic curve of the beam-column and the column-foot of recycled concrete frame is relatively full, and has good energy dissipation capacity. When the structural deformation is 3.5 times of yielding, its bearing capacity has no obvious decrease. Recycled concrete frame has good seismic performance, which is feasible for engineering practice.