A wireless passive sensing system for displacement/strain measurement in reinforced concrete members

Date
2016
Authors
Ozbey B.
Erturk V.B.
Demir H.V.
Altintas, A.
Kurc O.
Advisor
Instructor
Source Title
Sensors (Switzerland)
Print ISSN
14248220
Electronic ISSN
Publisher
MDPI AG
Volume
16
Issue
4
Pages
Language
English
Type
Article
Journal Title
Journal ISSN
Volume Title
Abstract

In this study, we show a wireless passive sensing system embedded in a reinforced concrete member successfully being employed for the measurement of relative displacement and strain in a simply supported beam experiment. The system utilizes electromagnetic coupling between the transceiver antenna located outside the beam, and the sensing probes placed on the reinforcing bar (rebar) surface inside the beam. The probes were designed in the form of a nested split-ring resonator, a metamaterial-based structure chosen for its compact size and high sensitivity/resolution, which is at µm/microstrains level. Experiments were performed in both the elastic and plastic deformation cases of steel rebars, and the sensing system was demonstrated to acquire telemetric data in both cases. The wireless measurement results from multiple probes are compared with the data obtained from the strain gages, and an excellent agreement is observed. A discrete time measurement where the system records data at different force levels is also shown. Practical issues regarding the placement of the sensors and accurate recording of data are discussed. The proposed sensing technology is demonstrated to be a good candidate for wireless structural health monitoring (SHM) of reinforced concrete members by its high sensitivity and wide dynamic range. © 2016 by the authors; licensee MDPI, Basel, Switzerland.

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Book Title
Keywords
Displacement measurement, Elastic-plastic deformation of steel, Metamaterial based sensors, Simply supported beam experiment, Strain measurement, Structural health monitoring, Wireless passive sensors, Concretes, Elastoplasticity, Metamaterials, Plastic deformation, Probes, Radio transceivers, Reinforced concrete, Strain measurement, Structural health monitoring, Displacement/strain measurements, Elastic and plastic deformation, Elastic-plastic deformation, Passive sensor, Reinforced concrete member, Simply supported beams, Wireless measurements, Wireless structural health monitoring, Displacement measurement
Citation
Published Version (Please cite this version)