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


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This study investigates an existing steel plate girder railroad bridge in order 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 on the top flange and the other on the bottom flange. The train passes over the bridge at different speeds, ranging from 10 km/h to 90 km/h, so as to monitor the dynamic response of the bridge. The results show that the proposed instrumentation technique is capable of estimating the deflection of the bridge for various loading conditions, which is crucial in structural monitoring.



Key Engineering Materials (Volumes 321-323)

Edited by:

Seung-Seok Lee, Joon Hyun Lee, Ik Keun Park, Sung-Jin Song, Man Yong Choi




W. S. Chung et al., "Monitoring of a Steel Plate Girder Railroad Bridge with Fiber Bragg Grating Sensors", Key Engineering Materials, Vols. 321-323, pp. 264-267, 2006

Online since:

October 2006




[1] R.C. Tennyson, A.A. Mufti, S. Rizkalla, G. Tadros and B. Benmokrane. Structural health monitoring of innovative bridges in Canada with fiber optic sensors. Smart Mater. Struct., Vol. 10 (2001), pp.560-573.


[2] E. Udd. Fiber Optic Smart Structures, John Wiley and Sons, New York. (1995).

[3] J.M. Gere, S.P. Timoshenko, Mechanics of Materials, 4 th ed., PWS Publishing Company (1997).

[4] S. Vurpillot, G. Kreuger, D. Benouaich, D. Clement and D. Inaudi. Vertical deflection of a pre- stressed concrete bridges obtained using deformation sensors and inclinometer measurements, ACI Structural Journal, Vol. 95, No. 5 (1998).


1 2 3 4 5 6 -1.

[1] [2] [3] [4] [5] [6] FBG LVDT FEM Elapsed time (sec).

5 10 15 20 25 -1.

[1] [2] [3] [4] [5] [6] Elapsed time (sec) FBG LVDT FEM.

1 2 3 4 5 6 -1.

[1] [2] [3] [4] [5] [6] Elapsed time (sec) FBG LVDT.

10 20 30 40 50 60.

[1] [2] [3] [4] [5] [6] Deflection (mm) Elapsed time (sec) FBG LVDT.