高模量聚乙烯纤维布约束混凝土柱轴压特性试验

邓宗才; 徐永朝; 曹炜

高模量聚乙烯纤维布约束混凝土柱轴压特性试验

Experiment on Behavior of Concrete Columns Confined by High Elastic Module Polyethylene Fiber Sheet Under Axial Compression

摘要

摘要: 试验研究了聚乙烯纤维布增强聚合物(PEFRP)约束混凝土柱体的轴心抗压性能,重点分析了其破坏形态、应力-应变全曲线、峰值应力、峰值应变、变形性能等.试验结果表明:1)相对于未约束混凝土试件,PEA-L-2、PEA-L-3、PEB-L-2、PEB-L-3约束混凝土棱柱体的抗压强度分别提高了10%、35%、27%和30%,峰值应变分别提高了195%、80%、207%和182%;2)PEA-C-2、PEA-C-3、PEB-C-2和PEB-C-3约束混凝土圆柱体的抗压强度分别提高了11%、21%、37%和53%,峰值应变提高了112%、150%、159%和142%.压缩韧性指数方法能评价PEFRP约束柱的变形能力,计算结果表明:PEA对提高柱韧性指数I₁效果比PEB显著,而延伸率高的PEB对改善柱后期延性效果更好.

Abstract: Based on the experiment on concrete columns confined with polyethylene fiber reinforced polymer(PEFRP) sheets under axial compression,the authors emphasized on analyzing failure configuration,bearing capacity,stress-strain curve and ductility.It is shown that: 1) comparing with the specimen without being confined,bearing capacity of concrete quadrate columns confined by PEA-L-2,PEA-L-3,PEB-L-2 and PEB-L-3 improves 10%,35%,27% and 30% respectively,peak strain improves 195%,80%,207% and 182% respectively;2) bearing capacity of concrete circular columns confined by PEA-C-2,PEA-C-3,PEB-C-2 and PEB-C-3 improves 11%,21%,37% and 53% respectively,peak strain improves 112%,150%,159% and 142% respectively.Toughness index could be adopted to evaluate the ductility of constraint column,and the result shows that PEA is better than PEB in improving column toughness index I₁,but PEB which has high elongation rate improve column late ductility effect more apparent.

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