Page 72 - 应用声学2019年第5期

第 38 卷 第 5 期 Vol. 38, No. 5
2019 年 9 月 Journal of Applied Acoustics September, 2019

⋄ 研究报告 ⋄

BFRP筋混凝土粘结-滑移声发射特性研究 ∗

陈育志 1† 陈师节 2

(1 金陵科技学院建筑工程学院 南京 211169)
(2 深圳市市政设计研究院有限公司 深圳 518029)

摘要 为研究 BFRP 筋与混凝土粘结 -滑移过程中的损伤特征，对 BFRP 筋混凝土粘结试件进行了加载速度
为 0.1 mm/s 的拔出试验。采用声发射技术对损伤过程的特点进行了研究，并且针对破坏预警指标的有效表征
进行了深入分析。结果表明，声发射能量、撞击数、振铃计数等参数能够真实反映 BFRP 筋混凝土粘结受载情
况，并得到 250 kHz ∼ 300 kHz 频段的声发射事件百分比及声发射 b 值范围可以作为粘结应力达到峰值时的
预警指标，为 BFRP 筋混凝土粘结 -滑移破坏预警提供了依据。
关键词 声发射，粘结 -滑移，BFRP 筋，混凝土，破坏预警
中图法分类号: TU502;TU375 文献标识码: A 文章编号: 1000-310X(2019)05-0824-06
DOI: 10.11684/j.issn.1000-310X.2019.05.010

Experimental study on AE characteristics of bond-slip for the BFRP
reinforced concrete

CHEN Yuzhi 1 CHEN Shijie 2

(1 Architecture Engineering Institute, Jinling Institute of Technology, Nanjing 211169, China)
(2 Shenzhen Municipal Design and Research Institute Co., Ltd., Shenzhen 518029, China)

Abstract In order to study the damage characteristics of BFRP bars and concrete during the bond-slip
process, the BFRP reinforced concrete specimens were subjected to pull-out test with a speed of 0.1 mm/s.
The characteristics of the damage process were studied by acoustic emission technology, and the effective
characterization of the damage warning indicators was analyzed. The results show that the parameters such as
acoustic emission energy, hit number and count can truly reflect the bond loading of BFRP reinforced concrete.
The percentage of acoustic emission events in the 250 kHz–300 kHz band and the range of acoustic emission b
value can be used as an early warning indicator when the bond stress reaches the peak value, which provides
a basis for the early warning of BFRP reinforced concrete bond slip damage.
Key words Acoustic emission, Bond-slip, BFRP rib, Concrete, Damage warning

2018-11-05 收稿; 2019-03-18 定稿
国家自然科学基金项目 (51178162)
∗
作者简介: 陈育志 (1985- ), 男, 江苏宿迁人, 博士研究生, 研究方向: 钢筋混凝土材料静动态力学性能。
† 通讯作者 E-mail: yuzhichen@jit.edu.cn