建筑结构学报2018，Vol.39Issue(4)：140-152,13.DOI:10.14006/j.jzjgxb.2018.04.016
钢-聚丙烯混杂纤维混凝土单轴循环受压应力-应变关系研究
Experimental investigation on stress-strain relation of steel-polypropylene hybrid fiber reinforced concrete subjected to uniaxial cyclic compression
摘要
Abstract
In order to investigate the mechanical behavior of steel-polypropylene hybrid fiber reinforced concrete (HFRC),a total of 48 concrete specimens for different fiber types,fiber volume fractions and aspect ratios were fabricated and tested under uniaxial cyclic compression.The influences of fiber parameters on the complete cyclic stress-strain relation of HFRC were analyzed.The results show that the failure of HFRC is ductile.The introduction of hybrid fibers has a synergetic effect on improving the cyclic mechanical behavior of concrete,e.g.peak stress,ductility,hysteretic dissipative energy and performance degradation.The hybrid fibers can lead to a remarkable restraint in plastic strain accumulation.The stiffness degradation of HFRC is moderate than that of plain concrete,meanwhile,the influence of fiber parameters is insignificant.In addition,negligible effects of fibers on the process of stress deterioration can be observed.Furthermore,based on the experimental results and other test data reported in open literature,a constitutive model is developed to generalize the stress-strain responses under uniaxial cyclic compression of HFRC specimens.It's agreed well between calculated results and test results.关键词
混杂纤维混凝土/单轴循环受压试验/应力-应变关系/破坏机理/混杂效应Key words
hybrid fiber reinforced concrete/uniaxial cyclic compression test/stress-strain relation/failure mechanism/synergetic effect分类
建筑与水利引用本文复制引用
徐礼华,李彪,池寅,黄彪,李长宁,时豫川..钢-聚丙烯混杂纤维混凝土单轴循环受压应力-应变关系研究[J].建筑结构学报,2018,39(4):140-152,13.基金项目
国家自然科学基金项目(51608397,51478367),高等学校博士学科点专项科研基金项目(20130141110044). （51608397,51478367）
