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不同强度聚乙烯纤维布约束混凝土柱轴压特性试验研究

发表时间:2013-07-31  浏览量:1002  下载量:304
全部作者: 邓宗才,徐永朝
作者单位: 北京工业大学城市与工程防灾减灾省部共建教育部重点实验
摘 要: 研究聚乙烯纤维增强聚合物(polyethylene fiber reinforced polymer,PEFRP)约束混凝土柱体的轴心抗压性能,重点分析其破坏形态、应力-应变全曲线、峰值应力、峰值应变、变形性能。试验结果表明:1) 相对于未约束混凝土试件,2层、3层高强度聚乙烯布约束棱柱体(PEA-L-2,PEA-L-3),2层、3层中等高强度聚乙烯布约束棱柱体(PEB-L-2,PEB-L-3)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) 2层、3层高强度聚乙烯布约束圆柱(PEA-C-2,PEA-C-3),2层、3层中等强度聚乙烯布约束圆柱体(PEB-C-2,PEB-C-3)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够较好地评价聚乙烯布约束柱的变形能力,计算结果表明:高强高模量对提高柱韧性指数I1的效果比中等强度聚乙烯布显著,而延伸率高的中等强度聚乙烯布对改善柱后期延性效果更好。
关 键 词: 复合建筑材料;聚乙烯纤维增强聚合物;轴压性能;约束混凝土;延性
Title: Experimental study on behavior of concrete columns confined by different strength polyethylene fiber sheets under axial compression
Author: DENG Zongcai, XU Yongchao
Organization: Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology
Abstract: Based on the experiments on concrete columns confined with polyethylene fiber reinforced polymer (PEFRP) sheets under axial compression, this research was emphasized on analyzing failure configuration, bearing capacity, stress-strain curve and ductility. The results showed that: 1) Comparing with the control specimen (without being confined), bearing capacity of concrete quadrate columns confined by two or three layer sheets of high strength polyethylene fiber (PEA-L-2, PEA-L-3), and two or three layer sheets of medium strength polyethylene fiber (PEB-L-2, PEB-L-3) improved 10%, 35%, 27% and 30% respectively. Peak strain improved 195%, 80%, 207% and 182% respectively; 2) Bearing capacity of concrete circular columns confined by two or three layer sheets of high strength polyethylene fiber (PEA-C-2, PEA-C-3), or by two or three layer sheets of medium strength polyethylene fiber (PEB-C-2, PEB-C-3) improved 11%, 21%, 37% and 53% respectively. Peak strain improved 112%, 150%, 159% and 142% respectively. 3) Toughness index was adopted to evaluate the ductility of constraint column. The results showed that PEA was better than PEB in improving column toughness index I1, but PEB which had high elongation rate could improve column late ductility effect more apparently.
Key words: composite construction materials; polyethylene fiber reinforced polymer; axial compression performance; confined concrete; ductility
发表期数: 2013年7月第14期
引用格式: 邓宗才,徐永朝. 不同强度聚乙烯纤维布约束混凝土柱轴压特性试验研究[J]. 中国科技论文在线精品论文,2013,6(14):1288-1294.
 
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