基于声发射的钢-连续纤维复合筋混凝土柱受压特性分析
Analysis of compression characteristics of steel-continuous fiber composite bar reinforced concrete columns based on acoustic emission
摘 要
为研究SFCB（钢-连续纤维复合筋）混凝土柱在单轴压缩状态下的特性，分别以纤维增强聚合物筋、钢-连续纤维复合增强筋作为配筋，设计并制作了12个直径为150 mm，高为300 mm的混凝土柱试件，基于声发射技术进行了单轴受压试验，获得了试件在单轴受压过程中的声发射信号。结果表明，SFCB相较于纤维增强聚合物筋具有良好的延性，可在一定程度上提高混凝土柱试件的极限承载力，其具有稳定的二次刚度，可以提高混凝土柱的抗变形能力；相比于BFRP（玄武岩纤维增强筋），SFCB能更好地限制拉伸裂缝的开展。
单轴压缩
破坏模式
二次刚度
SFCB concrete
uniaxial compression
failure mode
post-yield stiffness
Abstract
In order to study the characteristics of SFCB (steel-continuous fiber composite bar) concrete column under uniaxial compression, 12 concrete column specimens with diameter of 150 mm and height of 300 mm were designed and manufactured with fiber reinforced polymer reinforcement and steel-continuous fiber composite reinforcement as reinforcement respectively. Uniaxial compression tests were carried out based on acoustic emission technology. The acoustic emission signals of the specimens under uniaxial compression were obtained. The results show that SFCB has better ductility than the fiber reinforced polymer bars. SFCB can improve the ultimate bearing capacity of concrete columns to a certain extent. SFCB has stable post-yield stiffness and can improve the anti-deformation capacity of concrete columns. Compared with BFRP(basalt fiber reinforced plastics), SFCB can better limit the development of tensile fracture.
中图分类号 TU377.4 TG115.28 DOI 10.11973/wsjc202111004
所属栏目 试验研究
基金项目 国家自然科学基金资助项目（52008211，51979090）；江苏省高等学校自然科学研究面上项目（20KJB560015）；中央高校基本科研业务费专项资金资助项目（B200202076）
收稿日期 2021/6/4
修改稿日期
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联系人作者唐煜(yt@njfu.edu.cn)
备注吴瑾(1997-),女,硕士研究生,主要从事混凝土无损检测技术的研究工作
引用该论文: WU Jin,CHEN Xudong,TANG Yu,GUO Yuzhu,NING Yingjie. Analysis of compression characteristics of steel-continuous fiber composite bar reinforced concrete columns based on acoustic emission[J]. Nondestructive Testing, 2021, 43(11): 18～22
吴瑾,陈徐东,唐煜,郭玉柱,宁英杰. 基于声发射的钢-连续纤维复合筋混凝土柱受压特性分析[J]. 无损检测, 2021, 43(11): 18～22
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【5】陆春华,何礼远,褚天舒,等.侵蚀环境下GFRP筋力学性能退化试验[J].建筑科学与工程学报,2018,35(6):73-79.
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【10】TANG Y,SUN Z Y,WU G.Compressive behavior of sustainable steel-FRP composite bars with different slenderness ratios[J].Sustainability,2019,11(4):1118.
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