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Proceedings Paper

Bridge spatial displacement monitoring with 100 fiber optic deformation sensors: sensors network and preliminary results
Author(s): Samuel Vurpillot; Nicoletta Casanova; Daniele Inaudi; Pascal Kronenberg
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Paper Abstract

In 1996, our laboratory fitted a highway bridge near Geneva 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 behavior 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 its long term deformations. The aim is to retrieve the spatial displacements of the bridge in an earth-bound coordinate system by monitoring its internal deformations. The curvature of the bridge is measured locally at multiple locations along the bridge span by installing sensors at different distances from the neutral axis. By taking the double integral of the curvature and respecting the boundary conditions, it is then possible to retrieve the deformation of the bridge. The choice of the optimal emplacement of the sensor and the sensor network are also presented.

Paper Details

Date Published: 23 May 1997
PDF: 7 pages
Proc. SPIE 3043, Smart Structures and Materials 1997: Smart Systems for Bridges, Structures, and Highways, (23 May 1997); doi: 10.1117/12.274654
Show Author Affiliations
Samuel Vurpillot, Swiss Federal Institute of Technology (Switzerland)
Nicoletta Casanova, Swiss Federal Institute of Technology, SMARTEC SA, and IMM SA (Switzerland)
Daniele Inaudi, Swiss Federal Institute of Technology and SMARTEC SA (Switzerland)
Pascal Kronenberg, Swiss Federal Institute of Technology (Switzerland)

Published in SPIE Proceedings Vol. 3043:
Smart Structures and Materials 1997: Smart Systems for Bridges, Structures, and Highways
Norris Stubbs, Editor(s)

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