The structural performance of perforated steel columns (PSCs) is significantly more complex than the one of solid web I-shaped elements under the diversity of blast loading scenarios. The damage criterion of PSCs is not only related to initial deformation response during the blast but also the residual axial load capacity and it can be considered as a reliable index after the blast effects. Therefore, the PSCs damages will be studied in two stages; direct and post blast effects. In the present study, the dynamic response of PSCs was numerically evaluated under different levels of blast threats using LS-DYNA software. Extensive explicit finite element (FE) analyses are carried out to investigate the effect of various parameters, such as web opening shapes, boundary conditions and strengthening details on the damage index and toughness of the PSCs compared to the parent steel sections. The results of the comparative study show that the damage and toughness decrease when the support condition changes from pinned to fixed ends through the two stages of loadings. PSCs give high toughness compared to its parent sections during blast shock stage while, a remarkable decrease in toughness is observed during the application of axial gravity after blast shock. Furthermore, the web opening shapes have slight effects on the global dynamic behavior of PSCs, particularly in terms of residual capacity. On the contrary, the retrofitting strategy using both closed holes at end and vertical stiffeners have an effective enhancement to get higher toughness in case of the extreme blasts.

穿孔钢柱（PSCs）的结构性能在爆炸载荷的多样性下明显比实心腹板工字形元件复杂得多。PSCs的损伤判据不仅与爆炸过程中的初始变形响应有关，还与残余轴向载荷能力有关，可作为爆炸作用后的可靠指标。因此，PSCs损害将分两个阶段进行研究；直接和后爆炸效果。在本研究中，使用 LS-DYNA 软件对不同水平的爆炸威胁下 PSC 的动态响应进行了数值评估。进行了广泛的显式有限元 (FE) 分析，以研究各种参数的影响，例如腹板开口形状、与母钢截面相比，PSC 的损伤指数和韧性的边界条件和强化细节。对比研究结果表明，经过两个加载阶段，支座条件从销钉端变为固定端时，损伤和韧性均有所降低。PSCs 在爆炸冲击阶段与其母截面相比具有较高的韧性，而在爆炸冲击后施加轴向重力期间，韧性显着下降。此外，幅材开口形状对 PSC 的全局动态行为有轻微影响，特别是在剩余容量方面。相反，采用端部封闭孔和竖向加强筋的改造策略可以有效地增强在极端爆炸的情况下获得更高的韧性。