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提出了一种预应力钢带加固钢筋混凝土柱的新技术。进行了2个预应力钢带加固和1个CFRP加固的钢筋混凝土短柱的低周反复加载试验,通过与1个未加固的普通钢筋混凝土短柱的对比研究,比较分析了预应力钢带加固和CFRP加固短柱的破坏形态、滞回曲线、位移延性系数、骨架曲线、耗能性能以及刚度退化。研究结果表明,与未加固短柱相比,预应力钢带加固和CFRP加固的钢筋混凝土短柱极限荷载最大提高幅度分别为30.73%和31.04%,位移延性最大提高幅度分别为32.3%和52%。同等工况下,预应力钢带加固和CFRP加固短柱的抗震性能相近,可防止混凝土压碎剥落和纵筋屈曲,有效抑制混凝土裂缝扩展和减缓试件刚度退化,但预应力钢带加固钢筋混凝土短柱具有显著的经济优势和施工操作优势。
A new technology of strengthening prestressed steel bars with reinforced concrete columns was proposed. The low-cycle repeated loading test of two reinforced concrete short columns strengthened by prestressed steel strip and one CFRP reinforced strip was carried out. By comparing with an unreinforced conventional reinforced concrete short column, the reinforcement of prestressed steel strip was analyzed And CFRP reinforced short column damage morphology, hysteresis curve, displacement ductility coefficient, the skeleton curve, energy dissipation and stiffness degradation. The results show that the maximum increase of ultimate load of the short columns of reinforced concrete reinforced with prestressed steel strip and CFRP is 30.73% and 31.04% respectively, and the maximum increase of displacement ductility is 32.3% and 52% . In the same condition, the seismic behavior of the prestressed strip reinforcement and the CFRP reinforced short columns are similar, which can prevent the concrete from crushing and longitudinal buckling, effectively inhibit the expansion of concrete cracks and reduce the stiffness degradation of the specimens, but the prestressing steel strips reinforce the reinforcement Concrete short columns have significant economic advantages and construction operation advantages.