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Monitoring System For The Subway Structures Using Prestrained FBG Sensors Fixed With Partially Stripped Fibers  

Kim, Ki-Soo (홍익대학교 재료공학부)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.21, no.6, 2008 , pp. 607-613 More about this Journal
Abstract
A monitoring system for the subway structures using prestrained FBG sensors fixed with partially stripped fibers was developed. The sensor packages had pre-strain controllable fixtures. Tensile and compressive strain of the structure could be measured without slip. The FBG sensor system was applied to the concrete lining structure in Taegu subway. Near the structure, the narrow tunnel construction, for the electric power cables and telecommunication cables, started. We wanted to measure the deformations of the subway structures due to the construction by the FBG sensor. The applied sensors had the gauge length of 1 meter to overcome the inhomogeneity of the concrete material with enough length. In order to fix tightly to the structure, the partially stripped parts of the sensor glued to the package and slip phenomenon between fiber and acrylate jacket was prevented. Prestrain of the sensor was imposed by controlling the two fixed points with bolts and nuts in order to measure compressive strain as well as tensile strain. The behavior of subway lining structure could be monitored very well.
Keywords
fiber bragg grating sensors; packaging; structural health monitoring; partially stripped fiber; prestrain controllable fiber sensor; subway structures;
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