冲击荷载下基于埋入式光纤光栅传感器的混凝土动态应变测试

余尚江;陈显;杨吉祥

振动与冲击 ›› 2011, Vol. 30 ›› Issue (11) : 112-116.

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PDF(1285 KB)
振动与冲击 ›› 2011, Vol. 30 ›› Issue (11) : 112-116.
论文

冲击荷载下基于埋入式光纤光栅传感器的混凝土动态应变测试

  • 余尚江; 陈显; 杨吉祥
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Measurement of dynamic strain in concrete based on embedded fbg sensors during shpb impact test

  • Yu Shang-jiang; Chen Xian; Yang Ji-xaing
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摘要

为实现冲击荷载下混凝土材料内动态应变的直接测量,研制了基于光纤Bragg光栅的混凝土光纤光栅应变传感器。将光纤光栅传感器埋入混凝土试件在SHPB装置上进行了冲击试验,由光纤传感器和粘贴于试件表面的电阻应变计分别测量了试件内和表面的动态应变。利用测量结果分析了混凝土在冲击荷载下的动态应力应变响应。对测量结果的分析和比较表明,采用埋入光纤传感器来实现混凝土结构内应变直接测量的方法可行、合理,研制的光纤光栅传感器适合于混凝土内动态应变测量,可更广泛地应用于混凝土、岩石等介质的动态性能试验及结构的动态响应测试中。

Abstract

In order to .measure the dynamic strain in concrete during impact or explosive test, a fiber Bragg grating (FBG) sensor special designed for inner strain measurement in concrete was developed. The concrete specimens in which the FBG sensors were embedded were prepared and tested under impact in split Hopkinson pressure bar (SHPB). The inner and surface strains were measured by FBG sensors and strain gauges separately and an attempt to construct the dynamic relationship between stress and strain with the data was made. The analyses to the results show that the method of strain measurement in concrete with embedded FBG sensors is feasible and more reasonable if accurate strains and exact performance of concrete are demanded. The FBG sensors were proved to be suitable for dynamic strain measurement in concrete and can be widely used in concrete and rock during their dynamic performance tests and response measurement under impact or explosive loads.

关键词

光纤光栅传感器 / 光纤Bragg光栅 / 冲击 / SHPB装置

Key words

fiber bragg grating (FBG) / FBG strain sensor / impact / SHPB

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余尚江;陈显;杨吉祥 . 冲击荷载下基于埋入式光纤光栅传感器的混凝土动态应变测试[J]. 振动与冲击, 2011, 30(11): 112-116
Yu Shang-jiang;Chen Xian;Yang Ji-xaing. Measurement of dynamic strain in concrete based on embedded fbg sensors during shpb impact test[J]. Journal of Vibration and Shock, 2011, 30(11): 112-116

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