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 με (μm/m) according to the system calibration in the laboratory environment with non-uniform-distributed strain and ±5 με 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 με for fibers embedded in the GFRP rods and fibers bonded to steel reinforcing bars, respectively, whereas the strain deviation is ±20 με for the two-point loading case.
© 2002 Optical Society of America
[Optical Society of America ]
Xiaodong Zeng, Xiaoyi Bao, Chia Yee Chhoa, Theodore W. Bremner, Anthony W. Brown, Michael D. DeMerchant, Graham Ferrier, Alexander L. Kalamkarov, and Anastasis V. Georgiades, "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," Appl. Opt. 41, 5105-5114 (2002)