Preprint Article Version 2 This version is not peer-reviewed

Non Linear Strain Measures on Concrete Structures by Means of Embedded Optical Fiber Sensors

Version 1 : Received: 18 July 2018 / Approved: 18 July 2018 / Online: 18 July 2018 (13:10:25 CEST)
Version 2 : Received: 3 October 2018 / Approved: 6 October 2018 / Online: 6 October 2018 (10:56:36 CEST)

How to cite: Minutolo, V.; Zona, R. Non Linear Strain Measures on Concrete Structures by Means of Embedded Optical Fiber Sensors. Preprints 2018, 2018070331 (doi: 10.20944/preprints201807.0331.v2). Minutolo, V.; Zona, R. Non Linear Strain Measures on Concrete Structures by Means of Embedded Optical Fiber Sensors. Preprints 2018, 2018070331 (doi: 10.20944/preprints201807.0331.v2).

Abstract

Optical fiber sensors have become a widely-used tool to perform life-long monitoring of large structures. Different set-ups of sensors can be used to obtain information at different scopes. In this paper, the application of a portable Brillouin optical time domain analysis sensor applied to reinforced concrete beams is presented. The sensor is made up of a single-mode optical fiber applied to the structure that enables the measurement of tensile and compressive axial strain along the beams. The fiber is embedded into a concrete casting and fixed along the reinforcement bars so that a complete correlation can be obtained regarding strain and displacements in linear and non-linear flexural response. The use of four sensing fibers positioned along the beam's length at different vertical positions makes it possible to read the strain variation within the cross-section. In accordance with Bernoulli’s hypothesis, this allows curvature diagrams to be obtained across the structure. The measured curvature is used to set up the moment–curvature relationship, which highlights the possibility of the sensor monitoring structures continuously in space and time.

Subject Areas

concrete structures; structure monitoring; optical fiber sensors; distributed sensors; Brillouin scattering

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