Steel-reinforced concrete-filled steel tubular (SRCFST) structures were proposed in recent years and have been employed in engineering practices. To date, the existing studies mainly focused on the behaviours of SRCFST structural members under static or seismic load. Only very limited studies of the SRCFST structural members subjected to impact load, which might cause severe damage and even structural collapse, can be found in literature. In this study, experimental and numerical studies on square SRCFST specimens under lateral impact load are conducted. A total of eighteen square SRCFST specimens are fabricated and tested via a drop hammer impact device. Various parameters (i.e. impact velocity, boundary condition, impact direction, cross-section of steel profile and axial load level) are considered to evaluate their effects on impact responses of square SRCFST members. The damage modes, impact forces, mid-span displacement responses and energy absorption capacities of the tested specimens are extracted from testing data and analysed. Furthermore, by using the software ABAQUS, numerical model is established and validated with the testing results. With the validated numerical models, the damage evolution, sectional stress and energy distribution of the structure with different parameters and impacting scenarios are evaluated. The impact behaviours of square SRCFST and concrete-filled steel tubular (CFST) members are also compared and discussed.

近年来，提出了钢筋混凝土钢管结构（SRCFST），并已在工程实践中使用。迄今为止，现有研究主要集中在SRCFST结构构件在静载荷或地震载荷下的行为。在文献中只能找到关于SRCFST结构构件受到冲击载荷的非常有限的研究，这可能会导致严重的损坏甚至结构崩溃。在这项研究中，对方形SRCFST试样在横向冲击载荷下进行了实验和数值研究。总共制作了18个方形SRCFST标本，并通过落锤冲击装置进行了测试。各种参数（例如，撞击速度，边界条件，撞击方向，考虑钢截面的横截面和轴向载荷水平，以评估它们对方形SRCFST构件的冲击响应的影响。从测试数据中提取并分析了试样的损伤模式，冲击力，中跨位移响应和能量吸收能力。此外，通过使用ABAQUS软件，建立了数值模型并通过测试结果进行了验证。利用已验证的数值模型，评估了具有不同参数和撞击场景的结构的损伤演化，截面应力和能量分布。还对方形SRCFST和钢管混凝土（CFST）构件的冲击行为进行了比较和讨论。从测试数据中提取并分析了被测样品的中跨位移响应和能量吸收能力。此外，通过使用ABAQUS软件，建立了数值模型并通过测试结果进行了验证。利用已验证的数值模型，评估了具有不同参数和撞击场景的结构的损伤演化，截面应力和能量分布。还对方形SRCFST和钢管混凝土（CFST）构件的冲击行为进行了比较和讨论。从测试数据中提取并分析了被测样品的中跨位移响应和能量吸收能力。此外，通过使用ABAQUS软件，建立了数值模型并通过测试结果进行了验证。利用已验证的数值模型，评估了具有不同参数和撞击场景的结构的损伤演化，截面应力和能量分布。还对方形SRCFST和钢管混凝土（CFST）构件的冲击行为进行了比较和讨论。评估了具有不同参数和影响场景的结构的截面应力和能量分布。还对方形SRCFST和钢管混凝土（CFST）构件的冲击行为进行了比较和讨论。评估了具有不同参数和影响场景的结构的截面应力和能量分布。还对方形SRCFST和钢管混凝土（CFST）构件的冲击行为进行了比较和讨论。