Concrete-filled steel tubular (CFST) columns are widely used in engineering structures, and they have many different cross section types. Among these, normal solid sections and concrete-filled double-skin steel tubular sections are often used. Although many studies have been conducted on CFST columns with these two section types, no studies have been conducted on their damage assessment under blast loading. In this study, experimental analysis and a numerical simulation method were integrated to evaluate the responses and assess the damage of two concrete-filled steel tubular (CFST) columns with different cross sections subjected to near-field blast loading. The results showed that for a scaled distance of 0.14 m/kg^1/3, plastic bending deformation occurred on the surfaces of the two CFST columns facing the explosive. The antiexplosion performance of the normal solid-section (NSS) CFST column was better than that of the concrete-filled double-skin steel tubular (CFDST) column. The explosion centre was set at the same height as the middle of column, and the distributions of the peak pressure values of the two columns were similar: the peak pressures at the middle points of the columns were the greatest, and the peak pressures at the bottom were higher than those at the top. With the analysis of the duration of the positive pressure, the damage at the middle was the most severe when subjected to blast loading. Using pressure-impulse damage theory and the validated numerical simulations, two pressure-impulse damage evaluation curves for NSS and CFDST columns were established separately by analysing the experimental and simulation data. Finally, based on the two pressure-impulse damage evaluation curves, the two pressure-impulse damage criteria for these two different fixed-end CFST columns were defined based on the deflection of the surfaces facing the explosives. Furthermore, the mathematical formulae for the two different column types were established to generate pressure-impulse diagrams. With the established formulae, the damage of the CFST columns with these two cross section types can be evaluated. Damage to other similar CFST columns with different cross section types due to near-field blast loading can also be evaluated by this method.

中文翻译：

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近场爆破荷载作用下钢管混凝土柱损伤评估研究

钢管混凝土柱（CFST）广泛用于工程结构，并且具有许多不同的横截面类型。其中，通常使用普通实心型材和混凝土填充的双层钢管。尽管已经对具有这两种截面类型的CFST柱进行了许多研究，但尚未对爆炸载荷下的破坏评估进行过研究。在这项研究中，实验分析和数值模拟方法相结合，以评估响应和评估两根不同截面的钢管混凝土（CFST）柱在近场爆炸荷载作用下的损伤。结果表明，对于标度距离为0.14 m / kg ^1/3，两根CFST立柱面对炸药的表面发生塑性弯曲变形。普通实心截面（CFS）钢管柱的抗爆性能优于混凝土双壁钢管（CFDST）钢管。爆炸中心设置在与立柱中间相同的高度，并且两根立柱的峰值压力分布相似：立柱中点的峰值压力最大，而在立柱中点的峰值压力最大。底部高于顶部。通过对正压持续时间的分析，在承受爆炸载荷时，中间的损坏最为严重。利用压力脉冲损伤理论和经过验证的数值模拟，通过分析实验和模拟数据，分别建立了NSS和CFDST柱的两个压力-脉冲损伤评估曲线。最后，根据两条压力冲击损伤评估曲线，根​​据面对炸药的表面的挠度，为这两种不同的固定端CFST柱定义了两种压力冲击损伤准则。此外，建立了两种不同色谱柱类型的数学公式以生成压力脉冲图。通过建立的公式，可以评估这两种横截面类型的CFST柱的损伤。也可以通过此方法评估由于近场爆破载荷而对不同横截面类型的其他类似CFST柱造成的损坏。根据两条压力冲击破坏评估曲线，根​​据面对炸药的表面的挠度，为这两种不同的固定端CFST柱定义了两种压力冲击破坏准则。此外，建立了两种不同色谱柱类型的数学公式以生成压力脉冲图。通过建立的公式，可以评估这两种横截面类型的CFST柱的损伤。也可以通过此方法评估由于近场爆破载荷而对不同横截面类型的其他类似CFST柱造成的损坏。根据两条压力冲击破坏评估曲线，根​​据面对炸药的表面的挠度，为这两种不同的固定端CFST柱定义了两种压力冲击破坏准则。此外，建立了两种不同色谱柱类型的数学公式以生成压力脉冲图。通过建立的公式，可以评估这两种横截面类型的CFST柱的损伤。也可以通过此方法评估由于近场爆炸载荷而对不同横截面类型的其他类似CFST柱造成的损坏。建立了两种不同色谱柱类型的数学公式，以生成压力脉冲图。通过建立的公式，可以评估这两种横截面类型的CFST柱的损伤。也可以通过此方法评估由于近场爆破载荷而对不同横截面类型的其他类似CFST柱造成的损坏。建立了两种不同色谱柱类型的数学公式，以生成压力脉冲图。通过建立的公式，可以评估这两种横截面类型的CFST柱的损伤。也可以通过此方法评估由于近场爆炸载荷而对不同横截面类型的其他类似CFST柱造成的损坏。