Estimating deflection of a simple beam model using fiber optic bragg-grating sensors |
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Authors: | N -S Kim N -S Cho |
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Institution: | (1) Department of Civil Engineering, Pusan National University, 609-735 Busan, South Korea;(2) Hyundai Institute of Construction Technology, Hyundai Engineering and Construction Co., Ltd, 102-4 Mabuk-Ri, Goosung-Eup, 449-710 Kyunggi-Do, Yongin, South Korea |
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Abstract: | In this paper, we develop a method to estimate the bridge deflection using fiber optic Bragg-grating (FBG) strain sensors.
For most structural evaluation of bridge integrity, it is very important to measure the geometric profile, which is a major
factor representing the global behavior of civil structures, especially bridges. In the past, because of the lack of appropriate
methods to measure the deflection curve of bridges on site, the measurement of deflection has been restricted to just a few
discrete points along the bridge, and the measuring points have been limited to the locations installed with displacement
transducers. However, by applying classical beam theory, a formula is rearranged to estimate the continuously deflected profile
by using strains measured directly from several points. In addition, FBG strain sensors, which are electromagnetic, noise-free
and multipoint measurable, are employed to obtain flexural strains more accurately and stably. The regression analysis is
performed to obtain a strain function from the measured strain data. Finally, the deflection curve can be estimated by applying
the strain function to the formula. An experimental test has also been carried out to verify the developed method. |
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Keywords: | Bridge deflection fiber optic Bragg-grating sensor multipoint measurable strain function |
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