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Proceedings Paper

Long-term monitoring of a concrete bridge with 100+ fiber optic long-gauge sensors
Author(s): Daniele Inaudi; Samuel Vurpillot; Branko Glisic; Pascal Kronenberg; Sandra LLoret
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Paper Abstract

In 1996, a concrete highway bridge near Geneva (Switzerland) was instrumented with more than 100 low-coherence fiber optic deformation sensors. The Versoix Bridge is a classical concrete bridge consisting in two parallel pre-stressed concrete beams supporting a 30-cm concrete deck and two overhangs. To enlarge the bridge, the beams were widened and the overhang extended. In order to increase the knowledge on the interaction between the old and the new concrete, we choose low-coherence fiber optic sensors to measure the displacements of the fresh concrete during the setting phase and to monitor the long term deformations of the bridge. The aim is to retrieve the spatial displacements of the bridge in an earth-bound coordinate system by monitoring its internal deformations. The vertical and horizontal curvatures of the bridge are measured locally at multiple locations along the bridge span by installing sensors at different positions in the girder cross-section. By taking the double integral of the curvature and respecting the boundary conditions, it is then possible to retrieve the deformations of the bridge. This paper presents the sensor network design and the measurements that were performed during the construction phases, during the bridge operation since it was reopened and under a recent static-loading test.

Paper Details

Date Published: 1 February 1999
PDF: 10 pages
Proc. SPIE 3587, Nondestructive Evaluation of Bridges and Highways III, (1 February 1999); doi: 10.1117/12.339934
Show Author Affiliations
Daniele Inaudi, Swiss Federal Institute of Technology and Smartec SA (Switzerland)
Samuel Vurpillot, Swiss Federal Institute of Technology (Switzerland)
Branko Glisic, Swiss Federal Institute of Technology (Switzerland)
Pascal Kronenberg, Swiss Federal Institute of Technology (Switzerland)
Sandra LLoret, Swiss Federal Institute of Technology (Switzerland)


Published in SPIE Proceedings Vol. 3587:
Nondestructive Evaluation of Bridges and Highways III
Steven B. Chase, Editor(s)

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