The continuous-supported multi-column walls have already been used in modular steel buildings (MSB). Therefore, using two full-scale specimens, the current study evaluated the axial behaviour of planar multi-column walls with structural hollow sections (SHS). Then, a 3D finite element model (FEM) was created and validated to study the individual column and boundary support effects on each column. Prediction equations in EC3, AISC360, and GB50017 were then used to predict the ultimate compressive resistance of columns in walls. Because of the elastic buckling, the current slenderness limit for Class 3 steel cross-sections becomes less conservative. The boundary support effect enhances external columns rigidity and capacity than other columns, leading to instability. FEM provides reasonable estimates of the compressive behaviour of walls and each column. Each column exhibits distinct load distribution, confirming that the assumption of uniform load distribution among columns is unacceptable for multi-column modular walls. The prediction equations showed that GB50017 was safer than the EC3 and AISC, while EC3 was the least secure. Hence, the current study concluded experimental, numerical, and analytical findings to evaluate the axial behaviour of multi-column walls in multi-storey MSBs.

连续支撑的多柱墙已经用于模块化钢结构建筑 (MSB)。因此，本研究使用两个全尺寸试样，评估了具有结构空心截面 (SHS) 的平面多柱墙的轴向性能。然后，创建并验证 3D 有限元模型 (FEM) 以研究单个柱和每根柱上的边界支撑效应。然后使用 EC3、AISC360 和 GB50017 中的预测方程来预测墙中柱的极限抗压强度。由于弹性屈曲，目前 3 类钢横截面的细长限制变得不那么保守。边界支撑效应比其他柱子增强了外部柱子的刚度和承载力，导致不稳定。FEM 提供了对墙和每根柱子的压缩行为的合理估计。每根柱子都表现出不同的荷载分布，这证实了柱子之间均匀荷载分布的假设对于多柱模块化墙是不可接受的。预测方程表明GB50017比EC3和AISC更安全，而EC3最不安全。因此，目前的研究总结了实验、数值和分析结果，以评估多层 MSB 中多柱墙的轴向行为。