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First-time demonstration of measuring concrete prestress levels with metal packaged fibre optic sensors

Mckeeman, I and Fusiek, G and Perry, M and Johnston, M and Saafi, M and Niewczas, P and Walsh, M and Khan, S (2016) First-time demonstration of measuring concrete prestress levels with metal packaged fibre optic sensors. Smart Materials and Structures, 25 (9). ISSN 0964-1726

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Abstract

In this work we present the first large-scale demonstration of metal packaged fibre Bragg grating sensors developed to monitor prestress levels in prestressed concrete. To validate the technology, strain and temperature sensors were mounted on steel prestressing strands in concrete beams and stressed up to 60% of the ultimate tensile strength of the strand. We discuss the methods and calibration procedures used to fabricate and attach the temperature and strain sensors. The use of induction brazing for packaging the fibre Bragg gratings and welding the sensors to prestressing strands eliminates the use of epoxy, making the technique suitable for high-stress monitoring in an irradiated, harsh industrial environment. Initial results based on the first week of data after stressing the beams show the strain sensors are able to monitor prestress levels in ambient conditions.

Item type: Article
ID code: 57538
Notes: This is an author-created, un-copyedited version of an article accepted for publication in [insert name of journal]. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://dx.doi.org/10.1088/0964-1726/25/9/095051.
Keywords: fibre Bragg gratings, fibre optic sensors, structural health monitoring, prestress levels, monitoring, prestressed concrete, induction brazing, calibration, strain sensors, Engineering (General). Civil engineering (General), Civil and Structural Engineering
Subjects: Technology > Engineering (General). Civil engineering (General)
Department: Faculty of Engineering > Electronic and Electrical Engineering
Faculty of Engineering > Civil and Environmental Engineering
Depositing user: Pure Administrator
Date deposited: 25 Aug 2016 08:39
Last modified: 21 Sep 2017 13:45
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URI: https://strathprints.strath.ac.uk/id/eprint/57538
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