IHFRP布约束混凝土棱柱轴压力学性能试验研究  

Experiment and Study on Mechanical Property of Concrete Square Columns Confined by IHFRP Under Axial Compression

作　　者：邓宗才[1] 徐永朝[1] 

机构地区：[1]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室,北京市100124

出　　处：《公路》2011年第7期193-197,共5页Highway

基　　金：国家自然科学基金项目;项目编号50978006

摘　　要：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。On the basis of the axial compression test of 21 concrete square columns,failure configuration,stress-strain curve,peak strain,peak stress and ductility of concrete columns confined by IHFRP（interplay hybrid fiber reinforced polymer） are investigated.The results show that：（1） IHFRP are able to improve the bearing capacity of concrete square columns noticeably,the bearing capacity of specimens confined by IHFRP increases with increasing the content of carbon fiber in IHFRP;（2） Based on experimental data,the strength calculating model has been derived,confining coefficient is presented to be 5.45;（3） IHFRP are able to improve the ductility of concrete circular columns noticeably.The deformation property of confined concrete quadrate columns can be illustrated by the ductility index.

关 键 词：混凝土柱加固 层内混杂纤维 碳纤维 玻璃纤维 轴压性能 约束系数 延性 

分 类 号：TU502[建筑科学—建筑技术科学]