往复纯扭作用下中空夹层钢管混凝土柱受力性能研究

Mechanical behavior of concrete filled double skin steel tubular columns under cyclic pure torsion

为研究中空夹层钢管混凝土柱在扭矩作用下的滞回性能,以截面形式和空心率为主要参数,开展了4个中空夹层钢管混凝土柱试件在扭矩作用下的拟静力试验,得到了中空夹层钢管混凝土柱在往复扭矩作用下的破坏模式和扭矩-转角关系曲线。试验结果表明:中空夹层钢管混凝土柱在往复扭矩作用下的扭矩-转角滞回曲线较为饱满,没有出现"捏拢"现象,卸载刚度与初始弹性刚度接近,具有较好的耗能能力。往复扭矩作用下,圆形截面中空夹层钢管混凝土柱的扭转性能较方形截面中空夹层钢管混凝土柱更优。在截面外轮廓形状和尺寸相同的条件下,空心率对中空夹层钢管混凝土柱在往复扭矩作用下扭转性能的影响不大。

Based on the quasi-static test on four concrete filled double skin steel tubular columns subject to cyclic pure torsion,the torsion behavior of concrete filled double skin steel tubular columns with various section types and hollow ratios was studied. The failure modes and torsion-rotation angle relations of concrete filled double skin steel tubular columns under cyclic torsion were obtained. The test results show that the hysteretic loops of concrete filled double skin steel tubular columns under pure torsion are plump. The unloading stiffness is close to the initial elastic stiffness. The good energy dissipation capacity of concrete filled double skin steel tubular columns can be observed. Under cyclic torsion moment,the torsion-resistance capacity of circular concrete filled double skin steel tubular columns is better than that of square's. With the same thickness of inner steel tube,the same outer section size and shape,the hollow ratio of concrete filled double skin steel tubular columns has little effect on the cyclic torsion behavior.