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Sensors 2018, 18(4), 1224; https://doi.org/10.3390/s18041224

Monitoring of Carbon Fiber-Reinforced Old Timber Beams via Strain and Multiresonant Acoustic Emission Sensors

1
Department of Applied Physics, University of Granada, Campus Fuentenueva s/n, 18071 Granada, Spain
2
Department of Building Constructions, University of Granada, Campus Fuentenueva s/n, 18071 Granada, Spain
3
Department of Electronics and Computer Technology, University of Granada, Campus Fuentenueva s/n, 18071 Granada, Spain
*
Author to whom correspondence should be addressed.
Received: 13 March 2018 / Revised: 9 April 2018 / Accepted: 12 April 2018 / Published: 17 April 2018
(This article belongs to the Special Issue Ultrasonic Sensors 2018)
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Abstract

This paper proposes the monitoring of old timber beams with natural defects (knots, grain deviations, fissures and wanes), reinforced using carbon composite materials (CFRP). Reinforcement consisted of the combination of a CFRP laminate strip and a carbon fabric discontinuously wrapping the timber element. Monitoring considered the use and comparison of two types of sensors: strain gauges and multi-resonant acoustic emission (AE) sensors. Results demonstrate that: (1) the mechanical behavior of the beams can be considerably improved by means of the use of CFRP (160% in bending load capacity and 90% in stiffness); (2) Acoustic emission sensors provide comparable information to strain gauges. This fact points to the great potential of AE techniques for in-service damage assessment in real wood structures. View Full-Text
Keywords: timber; carbon fiber composites; acoustic emission sensors; structural monitoring timber; carbon fiber composites; acoustic emission sensors; structural monitoring
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Rescalvo, F.J.; Valverde-Palacios, I.; Suarez, E.; Roldán, A.; Gallego, A. Monitoring of Carbon Fiber-Reinforced Old Timber Beams via Strain and Multiresonant Acoustic Emission Sensors. Sensors 2018, 18, 1224.

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