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通过21个混凝土棱柱的轴心抗压性能试验,研究了碳、玻纤维层内混杂纤维布(IHFRP)约束混凝土柱的破坏形态、应力-应变全曲线、峰值应力、峰值应变和变形性能。试验结果表明:(1)IHFRP显著提高了柱的承载力,对于相同层数纤维布约束试件随着混杂纤维布中碳纤维含量的增加,承载力增长越显著;(2)基于试验数据线性回归得到了混杂纤维布约束混凝土棱柱的强度计算公式,IHFRP约束混凝土棱柱的强度约束系数为5.45;(3)IH-FRP显著改善了柱的延性性能,通过延性指数较好地分析了约束混凝土棱柱的变形性能。
Through the axial compression tests of 21 concrete prisms, the failure morphology, stress-strain curves, peak stress, peak strain and deformation of confined concrete columns confined with carbon fiber and fiberglass were studied. The experimental results show that: (1) IHFRP significantly enhances the bearing capacity of columns. For the same number of layers of fiber bundles, the load capacity increases significantly with the increase of carbon fiber content in the hybrid fiber cloth. (2) Based on the experimental data, The formula for calculating the strength of concrete prism confined by hybrid fiber cloth was obtained. The strength constraint coefficient of IHFRP-confined concrete prism was 5.45. (3) IH-FRP remarkably improved the ductility of the column. The ductility index of the confined concrete prism Deformation properties.