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采用聚对苯二甲酸乙二醇酯(PET)纤维布对不同箍筋锈蚀程度混凝土方柱进行外包抗震加固。通过对混凝土柱施加水平低周往复荷载,研究了PET纤维布外包损伤钢筋混凝土柱的破坏形态、滞回曲线、刚度退化、骨架曲线及耗能性能,并同一个未损伤柱和一个未损伤加固柱的试验结果进行对比,分析了不同箍筋锈蚀程度、外包PET纤维布体积率对混凝土柱抗震性能的影响。试验结果表明:钢筋混凝土柱在低周反复荷载作用下的破坏模式为脆性剪切破坏,但随着外包PET体积配筋率的增大由脆性剪切破坏变为弯曲-剪切破坏;随着钢筋锈蚀率的增加,损伤柱的受剪承载力、耗能性能及刚度降低;损伤钢筋混凝土柱在经过PET纤维布加固后,试验柱的承载力、刚度退化及抗震耗能性能均得到了显著提高。
Polyethylene terephthalate (PET) fiber cloth is used to outsource seismic reinforcement of concrete columns with different stirrups corroded degree. Through the application of horizontal low-cycle reciprocating loads to the concrete columns, the failure modes, hysteresis curves, stiffness degeneration, skeleton curves and energy dissipation properties of the reinforced concrete columns covered by PET fiber cloth were studied. The same uninjured columns and one unreduced reinforcement Column test results were compared and analyzed the degree of corrosion of different stirrups, outsourcing PET fiber cloth volume ratio of the seismic behavior of concrete columns. The experimental results show that the failure mode of reinforced concrete columns under cyclic loading is brittle shear failure, but the brittle shear failure changes to bending-shear failure with the increase of volume fraction of outsourcing PET, The corrosion rate of steel bars increases, the shear capacity, the energy dissipation performance and the stiffness of the damaged columns decrease. After the reinforced concrete columns are strengthened with PET fiber cloth, the bearing capacity, stiffness degradation and seismic energy dissipation performance of the test columns are significantly improve.