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Proceedings Paper

Railway bridge monitoring during construction and sliding
Author(s): Daniele Inaudi; Nicoletta Casanova; Pascal Kronenberg; Samuel Vurpillot
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Paper Abstract

The Moesa railway bridge is a composite steel concrete bridge on three spans of 30 m each. The 50 cm thick concrete deck is supported on the lower flanges of two continuous, 2.7 m high I-beams. The bridge has been constructed alongside an old metallic bridge. After demolishing this one, the new bridge has been slid for 5 m by 4 hydraulic jacks and positioned on the refurbished piles of the old bridge. About 30 fiber optic, low-coherence sensors were imbedded in the concrete deck to monitor its deformations during concrete setting and shrinkage, as well as during the bridge sliding phase. In the days following concrete pour it was possible to follow its thermal expansion due to the exothermic setting reaction and the following thermal and during shrinkage. The deformations induced by the additional load produced by the successive concreting phases were also observed. During the bridge push, which extended over six hours, the embedded and surface mounted sensors allowed the monitoring of the curvature variations in the horizontal plane due to the slightly uneven progression of the jacks. Excessive curvature and the resulting cracking of concrete could be ruled out by these measurements. It was also possible to observe the bridge elongation under the heating action of the sun.

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: 10.1117/12.274655
Show Author Affiliations
Daniele Inaudi, Swiss Federal Institute of Technology and SMARTEC SA (Switzerland)
Nicoletta Casanova, Swiss Federal Institute of Technology, SMARTEC SA, and IMM SA (Switzerland)
Pascal Kronenberg, Swiss Federal Institute of Technology (Switzerland)
Samuel Vurpillot, 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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