Developing an SHM system for FRP-strengthened beams

John P. Newhook

doi:10.1117/12.607482

19 May 2005 Developing an SHM system for FRP-strengthened beams

John P. Newhook

Proceedings Volume 5767, Nondestructive Evaluation and Health Monitoring of Aerospace Materials, Composites, and Civil Infrastructure IV; (2005) https://doi.org/10.1117/12.607482
Event: Nondestructive Evaluation for Health Monitoring and Diagnostics, 2005, San Diego, CA, United States

Abstract

Fibre reinforced polymer (FRP) laminates are used to rehabilitate concrete beams that do not possess the required ultimate flexural capacity. Because this is a new technology, there is a need to use structural health monitoring techniques in many of the field projects to verify their field performance and increase user confidence. This paper discusses the process of developing an SHM system for concrete beams with FRP flexural strengthening laminates. In the specific case of FRP laminates, debonding or delamination is a damage mechanism of specific concern. Through an experimental and theoretical study it is shown that strain monitoring would be the most effective technique for this application. Due to the need for a dense spatial resolution of sensors with low noise, Brillouin scatter or multi-Bragg grating style fibre optic sensors are suggested as the most appropriate for this application. A damage assessment methodology based of the shape of the laminate strain profile is established. While the precise methodology is specific to this application, the process of SHM system development discussed in the paper is adaptable to a wide range of field structures.

Citation Download Citation

John P. Newhook "Developing an SHM system for FRP-strengthened beams", Proc. SPIE 5767, Nondestructive Evaluation and Health Monitoring of Aerospace Materials, Composites, and Civil Infrastructure IV, (19 May 2005); https://doi.org/10.1117/12.607482

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