This study investigated the capacity of finite element modelling (FEM) approaches to predict the experimentally obtained behaviour of concrete-filled spiral-welded stainless-steel tube (CF-SWSST) short and long columns. Using the ABAQUS software, FEM was carried out of 24 CF-SWSST column tests. Nominal outside diameter to thickness ratios, effective length to diameter ratios and load eccentricity to diameter ratios equal to 51–114.5, 4.5–12.0, and 0–0.4 had been considered for the tests that were modelled. The distinct spiral weld seam geometry of the SWSST was explicitly considered in the FEM. Widely reported and accepted FEM modelling approaches and material models were adopted for this work. The concrete damaged plasticity model was utilised for the concrete core, while the stress–strain behaviour of stainless-steel was modelled using a modified Ramberg-Osgood relationship. On average, the capacities predicted by the FEM for the CF-SWSST columns were found to be non-conservative. The non-conservativeness was higher for specimens under concentric axial loading and increased with column and section slenderness. The actual to predicted capacity ratios were much closer to 1.0 for eccentrically loaded CF-SWSST columns, with conservative capacities predicted for eccentrically loaded specimens with the smallest section slenderness. For load eccentricity to diameter ratios of 0.15 and 0.4, there was negligible difference in the prediction conservativeness. Compared to analogous concrete-filled spiral-welded mild-steel tube columns, the FEM predictions obtained for the CF-SWSST columns were notably less conservative. This suggested that separate material constitutive models may be warranted for the FEM of CF-SWSSTs compared to their mild-steel counterparts. For the modelled eccentrically loaded specimens, the FEM predicted globally flexurally deformed states which agreed with those obtained experimentally, though the local buckling patterns were not replicated. In addition, the FEM qualitatively captured the experimentally obtained bending stiffness and strain variations. A modelling sensitivity study found that the FEM results were effectively equivalent even when the SWSSTs were modelled as plain seamless tubes.

这项研究调查了有限元建模（FEM）方法的能力，以预测通过实验获得的混凝土填充螺旋焊接不锈钢管（CF-SWSST）短柱和长柱的性能。使用ABAQUS软件，在24个CF-SWSST色谱柱测试中进行了有限元分析。建模试验考虑了标称外径与厚度之比，有效长度与直径之比以及载荷偏心率与直径之比等于51-114.5、4.5-12.0和0-0.4。FEM中明确考虑了SWSST独特的螺旋焊缝几何形状。这项工作采用了广泛报道并接受的有限元建模方法和材料模型。混凝土芯采用了混凝土破损可塑性模型，同时使用修正的Ramberg-Osgood关系对不锈钢的应力-应变行为进行建模。平均而言，发现FEM对CF-SWSST色谱柱的预测容量是非保守的。在同心轴向载荷下，样品的非保守性更高，并随着柱和截面的细长而增加。对于偏心加载的CF-SWSST色谱柱，实际容量与预测容量的比值非常接近1.0，对于截面细长度最小的偏心加载的样品，其容量的预测值较为保守。对于负载偏心率与直径之比为0.15和0.4的情况，预测保守性差异可忽略不计。与类似的混凝土填充螺旋焊接低碳钢管柱相比，对于CF-SWSST柱获得的FEM预测明显不那么保守。这表明，与低碳钢对应物相比，CF-SWSSTs的有限元法可能需要单独的材料本构模型。对于建模的偏心试样，有限元法预测了整体弯曲变形状态，与实验获得的状态一致，尽管没有局部屈曲模式。另外，FEM定性地捕获了实验获得的弯曲刚度和应变变化。建模敏感性研究发现，即使将SWSST建模为普通无缝管，FEM结果也有效等效。对于建模的偏心试样，有限元法预测了整体弯曲变形状态，该状态与实验获得的状态一致，尽管没有局部屈曲模式。另外，FEM定性地捕获了实验获得的弯曲刚度和应变变化。建模敏感性研究发现，即使将SWSST建模为普通无缝管，FEM结果也有效等效。对于建模的偏心试样，有限元法预测了整体弯曲变形状态，与实验获得的状态一致，尽管没有局部屈曲模式。另外，FEM定性地捕获了实验获得的弯曲刚度和应变变化。建模敏感性研究发现，即使将SWSST建模为普通无缝管，FEM结果也有效等效。