Condition assessment of reinforced concrete beams – comparing digital image analysis with optic fibre Bragg gratings

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Kearsley, Elsabe P.
Jacobsz, Schalk Willem

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EDP Sciences

Abstract

Reinforced concrete is the most widely used construction material and thus effective condition assessment of reinforced concrete elements forms a significant part of structural health monitoring. An effective structural health monitoring system should be able to give the owner prior warning that structural elements are reaching conditions approaching either serviceability or ultimate limit states. The aim of this investigation is to compare strain data recorded during load testing of a reinforced concrete beam using Fibre optic Bragg Gratings (FBG) and a photographic technique to determine circumstances most suitable for the use of each of the techniques. The test results indicate that FBG sensors can be used to detect small strains as well as large strains in uncracked concrete elements, while optical images can be used to accurately map crack development over the surface area of the structure.

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Keywords

Reinforced concrete, Owner, Uncracked concrete, Fibre optic Bragg gratings (FBG), Concrete beams and girders, Concrete testing, Geometrical optics, Load testing, Repair, Retrofitting, Strain, Structural health monitoring, Condition assessments, Digital image analysis, Photographic techniques, Ultimate limit state

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Citation

Kearsley, P. & Jacobsz, S.W. 2018, 'Condition assessment of reinforced concrete beams – comparing digital image analysis with optic fibre Bragg gratings', MATEC Web of Conferences, vol. 199, no. 6011, pp. 1-7.