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A platform for research: civil engineering, architecture and urbanism
Reinforcing and monitoring of concrete structure with composite and fibre optic sensors
In this work, fiber optic sensors have been embedded into composite materials to obtain a technology to monitor and reinforce concrete structures. Fiber Bragg Grating (FBG) sensors have been chosen as sensing devices as they present several advantages if compared with traditional systems. In particular they are slightly invasive, immune to electromagnetic interference and allow multiplexing of several sensors in a single optical fiber. The reliability of the sensor was verified by comparative measurements using traditional strain gauges. The validity of the proposed system was confirmed by tests in flexural and shear mode on typical concrete beams used in construction and civil sectors. The following conclusions can be drawn: a) The reinforcement ratio is lower than the forecast (a 70% in flexion, a 91.7% in shear and a 74.8% for the full reinforcement prototypes). This fact is due to the failure mode of the beams, which is the detachment (peeling-off) of the composite reinforcing elements, due to the high shear stresses developed between the concrete and the composite at the end of the beam, which are excessive for the concrete superficial layer, which cracks. To solve this problem, a mechanical anchor between the composite reinforcement and the concrete needs to be integrated at the ends of the beam. b) The reliability of the FBG is suitable for the proposed application. The sensors resist up to the beam failure and the agreement with the conventional strain gauges placed at the same position than the Bragg sensors is good. c) During the embedment process, the handling of the fiber optics with the Bragg gratings is quite critical, especially in the case of the pultrusion process.
Reinforcing and monitoring of concrete structure with composite and fibre optic sensors
In this work, fiber optic sensors have been embedded into composite materials to obtain a technology to monitor and reinforce concrete structures. Fiber Bragg Grating (FBG) sensors have been chosen as sensing devices as they present several advantages if compared with traditional systems. In particular they are slightly invasive, immune to electromagnetic interference and allow multiplexing of several sensors in a single optical fiber. The reliability of the sensor was verified by comparative measurements using traditional strain gauges. The validity of the proposed system was confirmed by tests in flexural and shear mode on typical concrete beams used in construction and civil sectors. The following conclusions can be drawn: a) The reinforcement ratio is lower than the forecast (a 70% in flexion, a 91.7% in shear and a 74.8% for the full reinforcement prototypes). This fact is due to the failure mode of the beams, which is the detachment (peeling-off) of the composite reinforcing elements, due to the high shear stresses developed between the concrete and the composite at the end of the beam, which are excessive for the concrete superficial layer, which cracks. To solve this problem, a mechanical anchor between the composite reinforcement and the concrete needs to be integrated at the ends of the beam. b) The reliability of the FBG is suitable for the proposed application. The sensors resist up to the beam failure and the agreement with the conventional strain gauges placed at the same position than the Bragg sensors is good. c) During the embedment process, the handling of the fiber optics with the Bragg gratings is quite critical, especially in the case of the pultrusion process.
Reinforcing and monitoring of concrete structure with composite and fibre optic sensors
Verstärkung und Monitoring von Betonkonstruktionen mit Verbundwerkstoffen und faseroptischen Sensoren
Mezzacasa, Ricardo (author) / Segura, Miguel (author) / Kenny, Jose (author) / Terenzi, Andrea (author)
2004
7 Seiten, 4 Bilder, 2 Tabellen, 6 Quellen
Conference paper
English
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