玻璃纤维增强复合材料筋混杂纤维混凝土短柱轴心受压性能的研究  

Study on Properties of GFRP-Reinforced Concrete Stubs with Hybrid Fibers Under Axial Compression

作　　者：肖良丽[1] 纪勤敏 杜壮 XIAO Liangli;JI Qinmin;DU Zhuang(College of City Construction,Wuhan University of Science and Technology,Wuhan 430065,China)

机构地区：[1]武汉科技大学城市建设学院,武汉430065

出　　处：《工业建筑》2022年第2期37-41,125,共6页Industrial Construction

基　　金：国家自然科学基金项目(51278391);武汉市城建委科技计划项目(201553)。

摘　　要：为了探寻玻璃纤维增强复合材料(GFRP)筋混杂纤维混凝土轴心受压短柱的破坏机理和设计方法,进行了5根GFRP筋混杂纤维混凝土短柱和1根普通钢筋混凝土短柱轴心受压性能研究,对GFRP筋混杂纤维混凝土轴心受压短柱的破坏形式、纵筋应变、混凝土压应变、极限荷载值等试验结果进行了分析。结果表明:掺入纤维的GFRP筋混凝土轴心受压短柱具有较好的阻裂性能且破坏后可以保持较好的整体性;掺入纤维的GFRP筋混凝土轴心受压短柱均有明显的塑性阶段,纤维可以有效抑制微裂缝扩展,改善混凝土延性;钢纤维掺入使混凝土弹性模量减小,聚乙烯醇(PVA)纤维使混凝土弹性模量增加;混杂纤维能有效提高GFRP筋混凝土短柱极限承载力,GFRP筋混杂纤维混凝土短柱中PVA纤维掺量为0.1%、钢纤维掺量为0.8%时比例最好。In order to explore the failure mechanism and design method of GFRP-reinforced concrete stubs with hybrid fibers under axial compression,five GFRP-reinforced concrete stubs with bybrid fibers and an ordinary reinforced concrete stub were studied,the failure mode,longitudinal reinforcement strain,concrete compressive strain and ultimate load value of GFRP hybrid-reinforced concrete stubs under axial compression were analyzed.The results showed that the GFRP-reinforced concrete stubs with hybrid fibers had good crack-resistance performances and good integrity after failure;the GFRP-reinforced concrete stubs with hybrid fibers had an obvious plastic stage under axial compression,and the fibers could effectively restrain from propagation of microcracks and increase the ductility of concrete;the elastic modulus of concrete decreased with the increase of steel fibers,and increased with the increase of PVA fibers;the hybrid fibers could effectively improve the ultimate bearing capacity of GFRP-reinforced concrete stubs,and it was the best proportion that the PVA fiber content was 0.1%and the steel fiber content was 0.8%.

关 键 词：GFRP筋 混杂纤维 混凝土短柱 轴心受压 破坏形态 承载力 

分 类 号：TU398.9[建筑科学—结构工程]