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提出了钢管混凝土边框内藏钢桁架混凝土组合核心筒,为了解其抗震性能,进行了1个钢管混凝土边框混凝土组合核心筒和1个钢管混凝土边框内藏钢桁架混凝土组合核心筒的低周反复荷载试验研究,2个试验模型为1/6缩尺。在试验基础上,分析比较了2个核心筒的承载力、延性、滞回特性、耗能能力、刚度衰减过程和破坏特征,分析结果表明:钢管混凝土边框内藏钢桁架混凝土组合核心筒抗震性能较好。在试验研究基础上,建立了钢管混凝土边框内藏钢桁架混凝土组合核心筒承载力简化力学计算模型与公式,计算结果与试验结果吻合较好。
In order to understand its anti-seismic performance, a steel tubular concrete frame combined core tube and a steel tube concrete frame built-in steel truss concrete composite core tube were fabricated by low cycle repeated load Experimental study, two experimental models for 1/6 scale. Based on the experiments, the bearing capacity, ductility, hysteretic characteristics, energy dissipation capacity, stiffness attenuation process and failure characteristics of two core cylinders are analyzed and compared. The results show that the seismic behavior of the composite core tube with steel truss frame better. Based on the experimental study, a simplified mechanical model and formula for calculating the bearing capacity of CFST core tube embedded in concrete filled steel tube (CFST) frame are established. The calculation results are in good agreement with the experimental results.