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A platform for research: civil engineering, architecture and urbanism
Strain evaluation of strengthened concrete structures using FBG sensors
Fibre-optic Bragg Grating (FBG) sensor presents a great deal of potential in monitoring the internal status of the concrete structures after repairing or strengthening by an external adhered reinforcement. It can be used in a variety of configurations ranging from pointwise to multi-point strain measurement in order to investigate the strain distribution of the structures. In this paper, an experimental investigation on the rectangular notched-concrete beam, which was strengthened by glass fibre composites with the embedment of multiplexing FBG sensors is presented. Three point bending test was performed to investigate the strain profile of the specimen. Frequency modulated continuous wave (FMCW) technique was used to measure the strain variation of the fibre-grating regions. The results give a good agreement with the electrical resistance strain gauge in early loading condition. The difference of the strain-measuring results between the strain-gauge and FBG sensor was increased when further increasing the applied load. It was suspected that the micro/macro cracks occurred on the concrete surface and that the externally bonded strain-measuring device cannot be detected.
Strain evaluation of strengthened concrete structures using FBG sensors
Fibre-optic Bragg Grating (FBG) sensor presents a great deal of potential in monitoring the internal status of the concrete structures after repairing or strengthening by an external adhered reinforcement. It can be used in a variety of configurations ranging from pointwise to multi-point strain measurement in order to investigate the strain distribution of the structures. In this paper, an experimental investigation on the rectangular notched-concrete beam, which was strengthened by glass fibre composites with the embedment of multiplexing FBG sensors is presented. Three point bending test was performed to investigate the strain profile of the specimen. Frequency modulated continuous wave (FMCW) technique was used to measure the strain variation of the fibre-grating regions. The results give a good agreement with the electrical resistance strain gauge in early loading condition. The difference of the strain-measuring results between the strain-gauge and FBG sensor was increased when further increasing the applied load. It was suspected that the micro/macro cracks occurred on the concrete surface and that the externally bonded strain-measuring device cannot be detected.
Strain evaluation of strengthened concrete structures using FBG sensors
Bewertung der Dehnung von verstärkten Betonstrukturen mittels faseroptischer Bragg-Gitter
Lau, K.T. (author) / Zhou, L.M. (author) / Ye, L. (author)
1999
6 Seiten, 4 Bilder, 1 Tabelle, 5 Quellen
Conference paper
English
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