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提出一种预应力钢带加固钢筋混凝土柱的新技术,并通过预应力钢带加固高轴压比钢筋混凝土矩形截面柱的拟静力试验,对该预应力钢带加固方法进行初步研究。在试验中主要考察轴压比和预应力钢带间距两个主要参数对加固后钢筋混凝土矩形截面柱抗震性能的影响规律。结合试验研究结果,对加固试件和未加固的对比试件的滞回曲线、骨架曲线、位移延性、刚度退化和耗能性能等抗震性能指标进行了比较研究。研究结果表明,预应力钢带加固技术可以明显改善钢筋混凝土柱抗震性能,具有良好应用前景。
A new technique of prestressing steel strip to reinforce reinforced concrete columns was put forward and the prestressing steel strip reinforcement method was preliminarily studied through the quasi-static test of strengthening prestressed strip with reinforced concrete columns with high axial compressive ratio. In the experiment, the influence of two main parameters, axial compression ratio and prestressed strip spacing on the seismic behavior of reinforced concrete rectangular cross-section columns was investigated. Combined with the experimental results, the seismic performance indexes such as hysteresis curve, skeleton curve, displacement ductility, stiffness degradation and energy dissipation performance of the strengthened and un-strengthened specimens were compared. The results show that the prestressed steel strip reinforcement technology can significantly improve the seismic behavior of reinforced concrete columns, and has good application prospects.