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对29根试件进行了CFRP约束素混凝土和钢筋混凝土圆柱的两阶段轴心抗压试验研究,考察了带载应力水平和截面尺寸对约束混凝土柱膨胀比的影响。试验结果表明:极限膨胀比随带载应力水平的增大先减小后增大。根据对试验数据的回归,得到了带载状态下CFRP约束混凝土圆柱的极限膨胀比影响因子,该因子以带载应力水平与约束比的比值n0/(fl/fco)为变量。在此基础上,对Teng等人建议的未带载情况膨胀比模型进行了改进,得到了可考虑带载影响的FRP约束混凝土全过程膨胀比模型,通过与试验结果比较表明,所有模型的预测效果良好。
Two-stage axial compressive tests on CFRP confined concrete and reinforced concrete columns were carried out on 29 specimens. The influence of stress level and cross-sectional dimension on the expansion ratio of confined concrete columns was investigated. The experimental results show that the ultimate expansion ratio first decreases and then increases with the increase of the load stress level. Based on the regression of the experimental data, the influence factor of the ultimate expansion ratio of CFRP confined concrete cylinder under loaded condition is obtained. The factor is based on the ratio n0 / (fl / fco) of the stress level and the constraint ratio. On this basis, the expansion ratio model of TPC et al. Proposed without load is improved, and the full expansion ratio model of FRP confined concrete considering loading effect is obtained. By comparing with the experimental results, the prediction of all models Good effect.