Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/31157
Title: Monitoring internal displacements of a model dam using FBG sensing bars
Authors: Zhu, HH
Yin, JH 
Zhang, L
Jin, W 
Dong, JH
Keywords: Dam
Fiber Bragg grating (FBG)
Internal displacement
Optical fiber sensing technology
Physical model test
Issue Date: 2010
Publisher: Multi-Science
Source: Advances in structural engineering, 2010, v. 13, no. 2, p. 249-261 How to cite?
Journal: Advances in structural engineering 
Abstract: Conventional instrumentation has difficulty to measure displacements inside laboratory-scale physical models. In this paper, an innovative fiber Bragg grating (FBG) sensing bar has been developed to perform high-accuracy and real-time monitoring of internal displacements. According to Euler-Bernoulli beam theory, the strain distribution measured by the quasi-distributed FBG sensors adhered on the bar surface can be used to compute the displacement profile along the sensing bar. The effectiveness of the FBG sensing bar has been verified by calibration tests. In the physical model of the Wudu gravity dam, two FBG sensing bars developed by the authors were installed, together with linear variable displacement transformers (LVDTs) and strain rosettes. The FBG sensing bars successfully captured the variation of internal displacement profiles in the model dam. The monitoring results during the overloading test were presented, based on which the deformation mechanism of the dam-foundation system is explained in details. The displacements measured by the FBG sensing bars are validated by their good agreements with those from LVDTs.
URI: http://hdl.handle.net/10397/31157
ISSN: 1369-4332
EISSN: 2048-4011
DOI: 10.1260/1369-4332.13.2.249
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