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Monitoring of a Steel Plate Girder Railroad Bridge with Fiber Bragg Grating Sensors  

Chung, Won Seok (한국철도기술연구원)
Kang, Dong Hoon (한국철도기술연구원)
Choi, Eun Soo (한국철도기술연구원)
Kim, Hyun Min (한국철도기술연구원)
Publication Information
Journal of Korean Society of Steel Construction / v.17, no.6, 2005 , pp. 681-688 More about this Journal
Abstract
This study investigates an existing steel plate girder railroad bridge after superstructure rehabilitation to monitor static and dynamic responses using Fiber Bragg Grating (FBG) sensors. This paper also presents an experimental technique to estimate the vertical deflection of the bridge using FBG sensors. Seven FBG sensors are multiplexed in a single optical fiber and installed in parallel pairs along the length of the bridge, with one set at the top flange and the other at the bottom flange. In addition to FBG sensors, a conventional electric strain gauge and anLVDT are installed at the mid-span of the bridge for comparison. A test train consisting of one locomotive is placed at the center of the bridge to produce the maximum static effect. The train is also made to pass over the bridge at different speeds ranging from 10 km/h to 90 km/h to monitor the dynamic response of the bridge. This study demonstrates that the measured strains using the FBG sensor compared well with the readings from the electric strain gauge. The results show that the proposed instrumentation technique is capable of estimating the vertical deflection of the bridge for various loading conditions, which is crucial in structural health monitoring. Several dynamic characteristics of the bridge were also identified.
Keywords
Fiber Bragg grating(FBG); multiplexing; railroad bridge; steel plate girder; dynamic test; deflection;
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