矩形钢管混凝土框架结构受力性能试验研究

EXPERIMENTAL RESEARCH ON MECHANICAL BEHAVIOR OF CONCRETE FILLED RHS FRAMES

为了研究矩形钢管混凝土梁在框架结构中的受力性能,并进一步分析全矩形钢管混凝土框架结构的抗震性能,对竖向荷载和低周反复水平荷载作用下的两榀单跨两层矩形钢管混凝土框架模型进行了抗震性能试验研究。以柱含钢率为变化参数,研究分析了矩形钢管混凝土框架结构的破坏机制、滞回特征、延性、强度及刚度退化等性能。结果表明:与钢筋混凝土、钢结构框架相比较,矩形钢管混凝土框架结构具有承载力高、耗能能力强、强度退化不明显、延性性能好等优点。由此可以推断:矩形钢管混凝土框架结构在承载力、抗震性能以及材料利用等方面有较多的优越性,有进一步研究和推广应用的价值。

In order to investigate the mechanical behavior of concrete filled RHS （rectangular hollow section） beams and the seismic behavior of concrete filled RHS frames, two one-bay, two-story concrete-filled RHS frame specimens are tested under static vertical loads and low cycle horizontal loads. Taking the steel ratio of column cross-section as the main experimental parameter, hysteretic behavior, ductility, degradation of strength and stiffness are examined and analyzed. The result indicates that the concrete-filled RHS frames have advantages such as higher bearing capacity, excellent energy dissipation capacity and ductility behavior, and inconspicuous strength degradation compared with the reinforced concrete frame and the steel frame. Therefore, it is concluded that the concrete-filled RHS frame has wonderful superiority on bearing capacity, seismic behavior and effective use of material; it deserves further research and wide application.