十字形截面钢-混凝土组合异形柱的抗震性能

为研究十字形截面钢-混凝土组合异形柱的抗震性能,对5个不同轴压比、配钢形式的试件进行低周反复加载试验。研究了滞回曲线、骨架曲线、延性性能、刚度退化、耗能性能等抗震性能,对比分析了轴压比和配钢形式对抗震性能的影响。结果表明,轴压比较大的试件具有更高的承载能力,但延性降低、刚度退化速率加快;与普通钢筋混凝土异形柱相比,在异形柱内配置型钢可改善滞回性能、增强刚度、延性性能、承载能力和耗能性能,减轻破坏程度,从而提高抗震性能。配钢形式为T形钢加方钢管的试件除刚度退化外,其他性能均优于实腹型配钢试件。

Seismic behavior of steel reinforced concrete cross-shaped columns

To investigate the seismic behavior of steel reinforced concrete cross-shaped columns, five specimens with different axial compression ratio and form of steel layout were tested under low cyclic loading. Hysteretic curves, skeleton curves, ductility performance, rigidity degeneration, and energy dissipation capacity were analyzed. The effects of axial compression ratio and form of steel layout to specimens were compared and analyzed. The results showed that with axial compression ratio increasing, the bearing capacity of specimens became higher, but the ductility and energy dissipation capacity turn to be lower, and the rate of rigidity degeneration trended to be quicker. Compared with ordinary reinforced concrete cross-shaped columns, the hysteretic behavior of concrete cross-shaped columns reinforced when shape steel was improved, the rigidity, ductility performance, bearing capacity and energy dissipation capacity were enhanced, the degree of failure were alleviated. Therefore, the seismic behavior of steel reinforced concrete cross-shaped columns was improved significantly. The seismic behavior of specimens of T-shaped steel combined with square steel tube was superior to solid-web steel reinforced concrete cross-shaped column except rigidity degeneration.