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Published in:
2021 | OriginalPaper | Chapter
Smart Composite Rebars Based on DFOS Technology as Nervous System of Hybrid Footbridge Deck: A Case Study
Authors : Rafał Sieńko, Łukasz Bednarski, Tomasz Howiacki
Published in: European Workshop on Structural Health Monitoring
Publisher: Springer International Publishing
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Abstract
The paper presents the concept and application of the smart pedestrian footbridge, equipped with DFOS strain sensors called EpsilonRebars. These sensors, in the form of composite rods being simultaneously the structural reinforcement for the concrete deck, were placed along the entire span of nearly 80 m. Thanks to the application of distributed optical fibre sensing technique DFOS, it is possible to perform measurements of strains, displacements (deflections) and temperature changes in a geometrically continuous manner along the entire length of the footbridge. The sensors integrated with the deck were used to measure selected physical quantities during the hydration of early-age concrete (thermal-shrinkage strains) as well as during the load tests. Sensor readings can be performed at any time of the structure operations in order to assess its technical condition (e.g. crack appearing) and to analyze the impact of environmental conditions and other factors, e.g. rheological phenomena.