12 October 2010 FBG sensor networks for the estimation of boundary shear stress around the novel piers
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The paper reports results obtained from a field test site in structural monitoring-a "test-to-failure," measuring strain using Fiber Bragg gratings (FBGs) sensor networks on a novel drilled concrete test pier in Huaihe river zone,Anhui province,China. To undertake the study, FBG-based sensors were chosen ,metallic recoated ,steel-tube packaged , and incorporated with steel rebars in this concrete structure. The sensors were interrogated using a compact system based on wavelength-division multiplexing (WDM) and F-P scanning approach. Throughout the test, the FBG sensors were continuously monitored, the incremental increases in the strain caused by boundary shear stress could be seen. The sensors were able to follow the resulting induced changes in load of over a range in excess of 2.5M Newton just prior to failure of the pier and representing extreme levels of strain for such a novel mechanical structure. The measurements made with the FBG-based system were found to be in agreement with the changes expected in the structure, produced by the self-balanced loading applied. The study has demonstrated the successful use of FBG sensor networks used in a test of this root type pier foundation, consequently made assessment about the health and security of the highway bridge.
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Chengang Lü and Ruifeng Zhang "FBG sensor networks for the estimation of boundary shear stress around the novel piers", Proc. SPIE 7659, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Smart Structures and Materials in Manufacturing and Testing, 76590P (12 October 2010); doi: 10.1117/12.866225; https://doi.org/10.1117/12.866225

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