【摘要】 通过6根全GFRP筋混凝土柱和1根混合配筋混凝土柱的低周反复加载试验,研究了体积配箍率、轴压比、剪跨比和纵筋种类对其抗震性能的影响,并将由国内外规范抗剪承载力计算方法得出的理论值与试验值进行对比.研究结果表明:全GFRP筋混凝土短柱均发生了剪切破坏,而全GFRP筋混凝土长柱和混合配筋混凝土短柱发生了弯曲破坏;全GFRP筋混凝土柱的滞回曲线具有明显的捏缩效应,且耗能能力稍差;传统的延性系数评价方法不能客观的评价GFRP筋混凝土柱的抗震性能,而综合性能指标则可以全面的反映GFRP筋混凝土柱的承载力和变形能力;当GFRP体积配箍率增大、剪跨比增大或轴压比减小时,柱的综合性能指标增大,抗震性能更好;各国规范计算的抗剪承载力均偏于安全,规范CSA-S806-12和GB50608—2010的计算值过于保守,而规范ACI 440.1R-15对抗剪承载力的预测相对合理.更多还原

【Abstract】 6 concrete columns reinforced with glass fiber-reinforced polymer(GFRP) bars and stirrups and 1 hybrid-reinforced concrete column were tested under constant axial load and lateral cyclic quasi-static load.The influence of the volumetric ratio of stirrups,the axial load level,the shear span ratio and the longitudinal reinforcement on the seismic performance was discussed.The test shear strength of the specimens were compared with theoretical results of different codes.The results show all the 4 short GFRP-reinforced concrete columns fail in shear failure.The other 2 long GFRP-reinforced concrete columns and the hybrid-reinforced concrete column are flexural failure.The hysteretic curves of GFRP-reinforced concrete columns have significant pinch phenomenon,and the energy dissipation capacity is at a relatively low level compared with hybrid-reinforced concrete columns.The traditional evaluation method of ductility coefficient can not objectively evaluate the seismic performance of GFRP-reinforced concrete columns.The integrated performance index can embody the bearing capacity and deformability.The integrated performance index increases with the volumetric ratio of stirrups increasing,the shear span ratio increasing and the axial load level decreasing,while the seismic performance of the specimens improves.And the theoretical shear strength is relatively conservative in general.The results of CSA-S806-12 and GB 50608—10 codes are too conservative while ACI 440.1 R-15 code predicts well for the shear strength of the specimens.更多还原