HFRP布约束混凝土圆柱体轴压力学性能试验

邓宗才; 阚德新; 翟胭脂

HFRP布约束混凝土圆柱体轴压力学性能试验

Experimental Study on Mechanical Property of Concrete Circular Columns Confined by HFRP Under Axial Compression

摘要

摘要: 通过碳纤维布、芳纶纤维布、玻璃纤维布和玄武岩纤维布混杂约束混凝土圆柱体的轴心抗压性能试验.研究了HFRP布约束混凝土柱的破坏形式、抗压强度、峰值应变和应力-应变全曲线.试验结果表明:1)相比未约束混凝土试件,1C/1G、1C/1B和1A/1B混杂约束试件的抗压强度分别提高了154%、134%和140%,峰值应变分别提高了393%、363%和476%;2)1C/2G、1C/2B和1A/2B混杂约束试件的抗压强度分别提高了187%、190%和170%,峰值应变分别提高了567%、511%和574%;3)2C/1G、1C/1A/1G和1C/1B/1G混杂约束试件的抗压强度分别提高了245%、233%和157%,峰值应变分别提高了649%、581%和426%;4)基于试验数据拟合HFRP约束混凝土圆柱体的强度约束系数为3.1.最后建立了HFRP约束混凝土圆柱体的3段式应力-应变曲线模型,与试验曲线良好吻合.

Abstract: Based on the experiment of concrete circular columns confined by hybrid fiber sheets of carbon FRP (CFRP)sheet,aramid FRP(AFRP)sheet,glass FRP(GFRP)sheet,fiber reinforced Basalt polymer (BFRP)sheet under axial compression,this paper analyzes failure configuration,bearing capacity,peak strain and stress-strain curve.Experimental results show that:1)Comparing with the specimen without being confined,bearing capacity of specimens confined by 1C/1G、1C/1B and 1A/1B improves 154%,134% and 140% respectively,peak strain improves 393%,363% and 476% respectively;2)Bearing capacity of specimens confined by 1C/2G、1C/2B and 1A/2B improves 187%,190% and 170% respectively,peak strain is improving 567%,511% and 574% respectively;3)Bearing capacity of specimens confined by 2C/1G、1C/ 1A/1G and 1C/1B/1G improves 245%、233% and 157% respectively,peak strain improves 649%,581% and 426% respectively;4)Based on experimental data,confining coefficient is presented to be 3.1;5)A tri- linear model is presented to predict the stress-strain response of concrete circular columns confined by HFRP. The theoretical curves agree well with the experimental data.

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