Concrete-filled steel tube (CFST) has been widely used in civil engineering. Numerous studies have shown that concrete-filled double-skin steel tube (CFDST) columns exhibit satisfactory mechanical properties under various loading conditions. Furthermore, ultra-high performance fiber-reinforced concrete (UHPFRC) has been developed as a prominent representative of new construction materials. This study investigates the residual bearing capacities of 10 concrete-filled steel tube specimens (three CFST columns and seven CFDST columns) after impact loading. The investigated parameters include the steel ratio, the concrete type, the section form, axial load ratio, the impact energy and the presence/absence of impact load. The results demonstrate that, when the inner steel tube thicknesses are identical, increasing the steel ratio from 0.296 to 0.467 (the outer steel tube thickness increases from 5 mm to 8 mm) can effectively improve the residual performance. For the non-impacted specimens, the bearing capacity of the CFDST columns is increased by 47.1% as the concrete type is changed from NSC to UHPFRC. For the impacted specimens, due to the influence of the test setup and other reasons, the concrete type has only a slight influence on the residual performance of CFDST columns; however, it has a substantial influence on the residual performance of the CFST columns. Furthermore, with the concrete type in the CFST columns changing from NSC to UHPFRC, the residual performance of CFST columns can be significantly enhanced.

钢管混凝土（CFST）已广泛用于土木工程中。大量研究表明，填充混凝土的双层钢管（CFDST）柱在各种载荷条件下均表现出令人满意的机械性能。此外，超高性能纤维增强混凝土（UHPFRC）已被开发为新型建筑材料的杰出代表。这项研究调查了10个钢管混凝土试样（三个CFST柱和七个CFDST柱）在冲击载荷后的残余承载力。研究的参数包括钢比，混凝土类型，截面形式，轴向载荷比，冲击能量和冲击载荷的有无。结果表明，当内钢管厚度相同时，钢比从0.296增加到0。467（外钢管的厚度从5毫米增加到8毫米）可以有效地改善残余性能。对于未受冲击的试样，随着混凝土类型从NSC变为UHPFRC，CFDST柱的承载力提高了47.1％。对于受冲击的试样，由于测试设置的影响和其他原因，混凝土类型对CFDST柱的残余性能影响很小。但是，它对CFST色谱柱的残留性能有重大影响。此外，随着CFST柱中的混凝土类型从NSC变为UHPFRC，CFST柱的残余性能可以得到显着提高。随着混凝土类型从NSC变为UHPFRC，CFDST柱的承载力提高了47.1％。对于受冲击的试样，由于测试设置的影响和其他原因，混凝土类型对CFDST柱的残余性能影响很小。但是，它对CFST色谱柱的残留性能有重大影响。此外，随着CFST柱中的混凝土类型从NSC变为UHPFRC，CFST柱的残余性能可以得到显着提高。随着混凝土类型从NSC变为UHPFRC，CFDST柱的承载力提高了47.1％。对于受冲击的试样，由于测试设置的影响和其他原因，混凝土类型对CFDST柱的残余性能影响很小。但是，它对CFST色谱柱的残留性能有重大影响。此外，随着CFST柱中的混凝土类型从NSC变为UHPFRC，CFST柱的残余性能可以得到显着提高。它对CFST色谱柱的残留性能有重大影响。此外，随着CFST柱中的混凝土类型从NSC变为UHPFRC，CFST柱的残余性能可以得到显着提高。它对CFST色谱柱的残留性能有重大影响。此外，随着CFST柱中的混凝土类型从NSC变为UHPFRC，CFST柱的残余性能可以得到显着提高。