Concrete Crack Monitoring Using a Novel Strain Transfer Model for Distributed Fiber Optics Sensors

Antoine Bassil (1, 2) , Xavier Chapeleau (1, 2) , Dominique Leduc (3) , Odile Abraham (4)

1 COSYS-SII - Structure et Instrumentation Intégrée
2 I4S - Statistical Inference for Structural Health Monitoring
3 GeM - Institut de Recherche en Génie Civil et Mécanique
4 GERS-GeoEND - Laboratoire Géophysique et évaluation non destructive

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.

Mots clés: WEDGE SPLITTING TEST; CRACK OPENING; CRACK; CONCRETE; FIBER OPTICS SENSORS; DISTRIBUTED STRAINS; IMPERFECT BONDING; STRAIN TRANSFER

Mots clés: OPTIQUE; CAPTEUR OPTIQUE; FISSURATION; BETON; DEFORMATION; REFLECTOMETRIE; RESISTANCE DES MATERIAUX; FIBRE OPTIQUE

Domaines: Mécanique des structures [physics.class-ph]

Antoine Bassil, Xavier Chapeleau, Dominique Leduc, Odile Abraham. Concrete Crack Monitoring Using a Novel Strain Transfer Model for Distributed Fiber Optics Sensors. Sensors, 2020, 8 (20), pp.1-17. ⟨10.3390/s20082220⟩. ⟨hal-02547903⟩