The mechanical behaviors of the self‐stressing steel slag aggregate concrete filled steel tubular (SSSACFST) stub column are investigated for practical structural applications. Twelve specimens under axial and eccentric compression are tested. The influences of different parameters, such as the eccentricity, the diameter–thickness ratio of the steel tube and the expansion rate of the steel slag aggregate concrete (SSAC) are studied. The experimental results show that the shear and the bending deformation dominate the failures of the specimens under axial and eccentric compression, respectively. The column with a high diameter–thickness ratio has a low ultimate bearing capacity and ultimate strain. The incremental range of the load capacity and the ultimate axial and circumferential strains of the specimens will be increased by raising the expansion rate of the SSAC. Based on the experimental results, the applicability of the current concrete filled steel tube design provisions for the SSSACFST stub columns is evaluated, and two analytical models for predicting the bearing capacity of the SSSACSFT stub columns under axial and eccentric compression are proposed.

中文翻译：

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自应力钢渣骨料混凝土钢管短柱的力学性能

研究了自应力钢渣骨料填充钢管（SSSACFST）短柱的力学性能，以用于实际的结构应用。测试了十二个在轴向和偏心压力下的试样。研究了偏心距，钢管的直径-厚度比和钢渣骨料混凝土（SSAC）的膨胀率等不同参数的影响。实验结果表明，在轴向和偏心压缩下，剪切和弯曲变形分别占试样破坏的主导。直径/厚度比高的色谱柱的极限承载力和极限应变低。通过增加SSAC的膨胀率，可以增加试样的承载能力以及极限轴向和圆周应变的增量范围。根据实验结果，评估了现行的钢管混凝土设计规范对SSSACFST短柱的适用性，并提出了两种分析模型来预测SSSACSFT短柱在轴向和偏心压缩下的承载力。