【摘要】 为了研究将延性好的混杂纤维布(HFRP)用于结构抗震加固的可行性,通过7根钢筋混凝土方柱的低周反复推拉加载试验,研究了HFRP加固混凝土方柱的抗震性能,分析了HFRP加固方柱的破坏形态、滞回曲线、骨架曲线、延性、刚度退化以及耗能能力,探讨了轴压比、HFRP粘贴层数以及配箍率对HFRP加固方柱抗震性能的影响.试验表明:粘贴HFRP能有效提高方柱的抗震性能;轴压比对HFRP加固方柱的影响较大,低轴压比更有利于HFRP对混凝土柱约束作用的发挥,轴压比越高,越不利于HFRP后期约束作用的发挥,柱延性越低;增加HFRP层数在低轴压比时方柱抗震性能提高明显,而在高轴压比时效果不大;配箍率的增大能提高方柱抗震性能,有利于方柱抗震.更多还原

【Abstract】 In order to research the feasibility of structural seismic retrofit with Hybrid FRP(HFRP) ,seven square reinforced concrete columns are tested under low cyclic alternate load to investigate the performances such as seismic behaviors,failure mode,hysteresis curves,skeleton curves,ductility,degradation of stiffness and energy consumption of square columns strengthened with HFRP. The effects of the axial load ratio,the amount of HFRP and the stirrup ratio on the seismic performance of square columns strengthened with HFRP are studied. The results show that the seismic performance can be improved effectively for square columns strengthened with HFRP. The effect of axial load ratio is great,and HFRP can confine concrete more effectively when the axial load ratio is low. The higher the axial load ratio is,the lower the confinement and the ductility are. The results also indicate that increasing the amount of HFRP can improve the seismic performance effectively when the axial load ratio is low but barely have any effect when the axial load ratio is high. The seismic performance of the square columns can be improved significantly by increasing the stirrup ratio.更多还原