摘要
为研究不同加载速率下钢筋混凝土粘结-滑移损伤破坏过程中的损伤特征,对钢筋混凝土粘结试件进行了0.01 mm/s～10 mm/s四种不同速度的拔出试验。采用实时动态的声发射监测技术对整个试验过程进行监测,对试验过程中的声发射信号进行声发射振幅-振铃计数特性及功率谱峰值频率特性分析。结果表明,随着滑移速率的增加,声发射振幅-振铃计数拟合曲线变缓,在0～50 k Hz和100～150 k Hz频率范围内的声发射事件比重分别减小和增加。损伤过程的声发射特性对钢筋混凝土粘结滑移损伤演化规律的研究具有重要的价值。
In order to observe the damage characteristics of bond-slip for the reinforced concrete with different slip rate,the real-time dynamic acoustic emission(AE)technology was applied to monitor the whole damage process of bond-slip for the reinforced concrete.The acoustic emission amplitude-count number characteristics and the power spectrum peak frequency of acoustic emission which obtained by FFT were analyzed.The results show that with increase of the slip rate,the curve of acoustic emission amplitude-count number shows the slow tread,the proportion of the acoustic emission event in0_50kHz and100_150kHz ranges decreases and increases respectively.This study has important value in the study of the damage evolution of bond slip for the reinforced concrete.
作者
陈育志
陈师节
CHEN Yuzhi;CHEN Shijie(Architecture Engineering Institute, Jinling Institute of Technology, Nanjing 211169, China;College of Civil and Transportation Engineering, Hobai University, Nanjing 210098, China)
出处
《应用声学》
CSCD
北大核心
2017年第4期343-348,共6页
Journal of Applied Acoustics
基金
国家自然科学基金项目(51178162)
关键词
声发射
粘结滑移
滑移速率
钢筋
混凝土
Acoustic emission
Bond-slip
Slip rate
Steel bar
Concrete
