Journal
SENSORS
Volume 18, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/s18041224
Keywords
timber; carbon fiber composites; acoustic emission sensors; structural monitoring
Funding
- DAVILA Restauracion de Monumentos and DRIZORO(R) S.A.U [3546]
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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.
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