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. 2016 Sep 22;16(10):1564.
doi: 10.3390/s16101564.

Strain Sharing Assessment in Woven Fiber Reinforced Concrete Beams Using Fiber Bragg Grating Sensors

Roberto Montanini  1 , Antonino Recupero  2 , Fabrizio De Domenico  3 , Fabrizio Freni  4
Affiliations

Strain Sharing Assessment in Woven Fiber Reinforced Concrete Beams Using Fiber Bragg Grating Sensors

Roberto Montanini et al. Sensors (Basel). .

Abstract

Embedded fiber Bragg grating sensors have been extensively used worldwide for health monitoring of smart structures. In civil engineering, they provide a powerful method for monitoring the performance of composite reinforcements used for concrete structure rehabilitation and retrofitting. This paper discusses the problem of investigating the strain transfer mechanism in composite strengthened concrete beams subjected to three-point bending tests. Fiber Bragg grating sensors were embedded both in the concrete tensioned surface and in the woven fiber reinforcement. It has been shown that, if interface decoupling occurs, strain in the concrete can be up to 3.8 times higher than that developed in the reinforcement. A zero friction slipping model was developed which fitted very well the experimental data.

Keywords: Fiber Bragg grating sensor; embedded optical fiber sensor; fiber reinforced cementitious matrix (FRCM); rehabilitation and retrofitting; strain measurements; strain transfer mechanism; strengthened concrete structures.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
(a) Post-cured concrete beam with embedded FBG; (b) PBO reinforcing woven instrumented with FBGs and electrical strain gauge (before application).
Figure 2
Figure 2
Schematic drawing of instrumented FRCM strengthened beam with embedded FBGs. (not in scale).
Figure 3
Figure 3
Tensile test carried out on the PBO mesh woven instrumented with FBG and strain gauge: Experimental set-up.
Figure 4
Figure 4
Three-point bending test carried out on FRCM strengthened beam instrumented with FBGs: Experimental set-up.
Figure 5
Figure 5
Theoretical model: zero friction slipping hypothesis.
Figure 6
Figure 6
Tensile tests carried out on PBO textile instrumented with FBG and strain gauge: Averaged stress-strain curves.
Figure 7
Figure 7
Three-point bending tests carried out on FRCM-reinforced concrete beams with embedded FBGs: Load-strain curves measured in concrete and in FRCM reinforcement.
Figure 8
Figure 8
Load-strain curves obtained by applying Equations (18) (concrete) and (19) (Fiber Reinforced Cementitious Matrix) with data reported in Table 1.
See this image and copyright information in PMC

References

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