This paper proposes a novel cross-shaped column in which steel fibre reinforced concrete (SFRC) is integrated with a high-strength stirrup to enhance its seismic behaviour. An experimental investigation was conducted on eight cross-shaped column specimens subjected to cyclic lateral loading. All of the specimens were evaluated in terms of their cracking patterns, failure modes, hysteresis behaviour, deformation and ductility, strength and stiffness degradation, and energy dissipation performance. The effects of the stirrup strength, stirrup spacing, steel fibre content, and axial load ratio were investigated. The experimental results demonstrated that all of the specimens exhibited flexural failure. The cracked concrete of the specimens with steel fibres could be prevented from spalling. The hysteresis loops of all of the specimens were relatively full without a readily observable pinching phenomenon and the specimens possessed a satisfactory energy dissipation capacity. Compared with the normal specimens, the specimens with high-strength stirrups, close stirrup spacing, and steel fibre exhibited a higher energy dissipation capacity, lateral bearing capacity, displacement ductility, and initial stiffness. However, the ductility rapidly decreased as the axial load ratio increased. Additionally, neither the incorporation of steel fibre nor the reduction of the stirrup spacing or the axial load ratio substantially mitigated the stiffness degradation. Based on the test results, calculation models were proposed for calculating the seismic bending moment capacities of the specimens. The calculated values were in accordance with the test results.

本文提出了一种新型的十字形柱，其中钢纤维混凝土（SFRC）与高强度箍筋结合在一起以增强其抗震性能。对八个承受循环横向载荷的十字形圆柱试样进行了实验研究。对所有试样的破裂模式，破坏模式，磁滞行为，变形和延展性，强度和刚度退化以及能量耗散性能进行了评估。研究了箍筋强度，箍筋间距，钢纤维含量和轴向载荷比的影响。实验结果表明，所有试样均表现出弯曲破坏。可以防止钢纤维试样的开裂混凝土剥落。所有样品的磁滞回线都比较完整，没有容易观察到的收缩现象，并且样品具有令人满意的能量消散能力。与普通试样相比，具有高强度箍筋，紧密箍筋间距和钢纤维的试样具有更高的能量耗散能力，侧向承载能力，位移延性和初始刚度。但是，延性随着轴向载荷比的增加而迅速降低。另外，既不掺入钢纤维也不减少箍筋间距或轴向载荷比，基本上不减轻刚度的降低。根据试验结果，提出了计算模型的抗弯弯矩承载力的计算模型。