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Abstract
In this paper, we study the strain transfer mechanism between a host material and an optical fiber. A new analytical model handling imperfect bonding between layers is proposed. A general expression of the crack-induced strain transfer from fractured concrete material to optical fiber is established in the case of a multilayer system. This new strain transfer model is examined through performing wedge splitting tests on concrete specimens instrumented with embedded and surface-mounted fiber optic cables. The experimental results showed the validity of the crack-induced strain expression fitted to the distributed strains measured using an Optical Backscattering Reflectometry (OBR) system. As a result, precise estimations of the crack openings next to the optical cable location were achieved, as well as the monitoring of the optical cable response through following the strain lag parameter.
Highlights
Detection and monitoring of crack openings are critical points in the structural health monitoring of civil structures
While several types of sensors and Non Destructive Testing (NDT) techniques can be used for this purpose, optical fibers are interesting because of their ability to perform distributed measurements, making them more likely to intercept cracks propagating in a structural element (Figure 1a)
The authors proposed an analytical model for a Silica optical fiber/coating/host material mechanical system
Summary
Detection and monitoring of crack openings are critical points in the structural health monitoring of civil structures. Some are conceived to be embedded inside the structure during construction, while others are more suitable for surface installation on existing structures These cables, formed of different materials and shaped in different forms, lead to a different strain transfer response due to shear lag effect in the intermediate layers. The authors proposed an analytical model for a Silica optical fiber/coating/host material mechanical system. Imai et al [5] adapted the assumption proposed previously by Duck et al [27], by introducing the effect of a crack discontinuity in the host material as a Gaussian distribution at the contact interface with protective coating It was used as an input to a finite element model, showing that the crack-induced strain distribution in the optical fiber takes the form of an exponential distribution. The experimental results demonstrate the validity of the model and the precision of the estimated crack openings
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