Steel fibers increase the strain capacity of normal and high-strength concrete columns. Availability of normal or high-strength concrete and conventional reinforcement is limited for low-rise concrete houses in rural areas. It is in the interest of society, of the thousands of people that live in those houses, that house performance be evaluated. This paper assesses the behavior of 18 short, square-section columns made of low-strength concrete reinforced with hybrid steel bars and micro-fibers under axial compressive loads. The investigated variables were the steel ratio (2.8% and 5.6%) and layout of transverse reinforcement and the fiber dosage (10 kg/m³ and 20 kg/m³). Response of the specimens was assessed in terms of crack patterns and failure modes, compressive stress–strain curves and the contribution of concrete, conventional steel reinforcement and steel fibers to the performance of the columns. Experimental stress–strain curves of the columns were compared with those computed using existing analytical models. The comparison of the measured and calculated stress–strain curves showed that it is required to calibrate a model for the columns with the key characteristics included in the experimental campaign. The study developed a behavioral model that is consistent with the trends of the results measured. The effectiveness of the proposed model was evaluated through statistical analysis.

钢纤维增加了普通和高强度混凝土柱的应变能力。对于农村地区的低层混凝土房屋，普通或高强度混凝土以及常规钢筋的可用性受到限制。为了社会的利益，评估这些房屋的成千上万的人的住房性能。本文评估了18个由低强度混凝土制成的，由混合钢筋和微纤维增强的短方形截面柱在轴向压缩载荷下的性能。研究的变量是钢的比例（2.8％和5.6％），横向钢筋的布局以及纤维的用量（10 kg / m ³和20 kg / m ³）。根据裂缝模式和破坏模式，压缩应力-应变曲线以及混凝土，常规钢筋和钢纤维对柱性能的影响，评估了样品的响应。将柱子的实验应力-应变曲线与使用现有分析模型计算出的曲线进行了比较。测量和计算的应力-应变曲线的比较表明，需要针对具有试验活动中关键特征的色谱柱模型进行校准。该研究开发了一种行为模型，该模型与测量结果的趋势一致。通过统计分析评估了所提出模型的有效性。