To study the influence of an initial imperfection on the cyclic performance of concrete-filled steel tubular (CFST) members, twelve specimens were cast with different notch lengths, notch widths, notch orientations and notch locations. These specimens were implemented in a lateral quasi-static test, and the test details, damage modes, load-deflection responses and strain histories were detailed and recorded. The measured and theoretical equivalent elastic flexural stiffness, displacement ductility coefficient, maximum lateral load, and measured and theoretical bending capacity of all the specimens were collected and analysed. The research results showed that all specimens mainly experienced flexural damage with different damage levels. Good agreement was observed between the measured and theoretical elastic flexural stiffness as well as the bending capacity for the intact specimens (specimen 1 and specimen 2). The mid-span notch weakened the equivalent elastic flexural stiffness, displacement ductility and flexural capacity of the CFST specimens. Furthermore, a horizontal mid-span notch resulted in greater impact on the specimen behaviour than a vertical notch or a quarter-span notch, an observation that deserves particular attention.

为了研究初始缺陷对钢管混凝土 (CFST) 构件循环性能的影响，铸造了十二个具有不同缺口长度、缺口宽度、缺口方向和缺口位置的试样。这些试样在横向准静态试验中实施，试验细节、损伤模式、载荷-挠度响应和应变历史被详细记录。收集并分析了所有试件的实测和理论等效弹性弯曲刚度、位移延性系数、最大横向载荷以及实测和理论弯曲能力。研究结果表明，所有试件主要经历了不同损伤程度的弯曲损伤。在测量的和理论的弹性弯曲刚度以及完整试样（试样 1 和试样 2）的弯曲能力之间观察到良好的一致性。中跨缺口削弱了 CFST 试件的等效弹性抗弯刚度、位移延展性和抗弯能力。此外，与垂直缺口或四分之一跨度缺口相比，水平中跨缺口对试样行为的影响更大，这一观察值得特别关注。