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为了研究预应力碳纤维条带加固钢筋混凝土圆形墩柱的抗震性能,对7根钢筋混凝土圆形墩柱在低周反复荷载作用下的滞回性能进行了试验研究,试验考虑的主要参数为环向预应力大小和轴压比。试验结果表明:预应力纤维条带提供的主动横向约束力能够有效抑制斜向剪切裂缝的开展,将圆形墩柱的破坏形态由剪切破坏转变为延性较好的弯曲破坏。通过分析各工况下被加固圆形墩柱的滞回性能,得出其恢复力模型的滞回规则;采用理论分析与试验数据回归分析相结合的方法,给出预应力碳纤维条带加固混凝土圆形墩柱的正截面抗弯承载力计算公式,得出骨架曲线各特征参数的计算方法,确定了卸载刚度和再加载、反复加载下的强度退化率,最终建立了能够考虑轴压比与环向预应力大小两因素的预应力碳纤维条带加固混凝土圆形墩柱三折线型恢复力模型,计算结果与试验结果吻合较好。
In order to study the seismic behavior of reinforced concrete circular column with prestressed carbon fiber strips, the hysteretic behavior of seven reinforced concrete circular columns subjected to cyclic loading under low cyclic loading was investigated. The main parameters considered in the experiment were the ring To prestress size and axial pressure ratio. The experimental results show that the active lateral restraint provided by the prestressed fiber strip can effectively suppress the development of oblique shear cracks and transform the failure form of circular piers from shear failure to bending failure with good ductility. By analyzing the hysteretic behavior of the circular column strengthened under various conditions, the hysteretic rules of the restoring force model are obtained. By combining the theoretical analysis and experimental data regression analysis, the prestressed carbon fiber reinforced concrete The calculation formula of the flexural capacity of the circular section of the circular column and the calculation method of the characteristic parameters of the skeleton curve are obtained.The strength degeneration rate under unloading stiffness and reloading and repeated loading is determined, The three-fold linear restoring force model of reinforced concrete circular piers is strengthened by prestressed carbon fiber bands with two factors of prestressing force. The calculated results are in good agreement with the experimental results.