Strain measurement in a concrete beam by use of the Brillouin-scattering-based distributed fiber sensor with single-mode fibers embedded in glass fiber reinforced polymer rods and bonded to steel reinforcing bars.
The strain measurement of a 1.65-m reinforced concrete beam by use of a distributed fiber strain sensor with a 50-cm spatial resolution and 5-cm readout resolution is reported. The strain-measurement accuracy is +/-15 microepsilon (microm/m) according to the system calibration in the laboratory environment with non-uniform-distributed strain and +/-5 microepsilon with uniform strain distribution. The strain distribution has been measured for one-point and two-point loading patterns for optical fibers embedded in pultruded glass fiber reinforced polymer (GFRP) rods and those bonded to steel reinforcing bars. In the one-point loading case, the strain deviations are +/-7 and +/-15 microepsilon for fibers embedded in the GFRP rods and fibers bonded to steel reinforcing bars, respectively, whereas the strain deviation is +/-20 microepsilon for the two-point loading case.
Department of Physics, University of Ottawa, Ontario, Canada. xzeng@science.uottawa.ca
Xiaodong
X
Zeng
Xiaoyi
X
Bao
Chia Yee
CY
Chhoa
Theodore W
TW
Bremner
Anthony W
AW
Brown
Michael D
MD
DeMerchant
Graham
G
Ferrier
Alexander L
AL
Kalamkarov
Anastasis V
AV
Georgiades