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Proceedings Paper

Estimation of load redistribution on a cable-stayed bridge using a combination of sensing techniques
Author(s): Daniele Zonta; Paolo Esposito; Marco Molignoni; Matteo Pozzi; Riccardo Zandonini; Ming Wang; Yang Zhao; Daniele Inaudi; Daniele Posenato; Branko Glisic
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Paper Abstract

The motivation of this work is the installation of a monitoring system on a new cable-stayed bridge spanning the Adige River 10 km north of the town of Trento. This is a statically indeterminate structure, having a composite steel-concrete deck of length 260 m overall, supported by 12 stay cables, 6 per deck side. These are full locked steel cables of diameters 116 mm and 128 mm, designed for operational loads varying from 5000 to 8000 kN. The structural redundancy suggests that plastic load redistribution among the cables can be expected in the long term. To monitor such load redistribution, the owner decided to install a monitoring system to measure cable stress; the precision specified was of the order of few MPa. However no cable release or any form of on-site calibration involving tension change was allowed. The solution found was a combination of built-on-site electromagnetic and fiber-optic elongation gauges, these appropriately distributed on both the cables and the anchorages. We discuss how the set of gauges allows tension and elongation measurement with the appropriate precision, and compare the initial monitoring results with the tension estimates made using a non-destructive vibration test.

Paper Details

Date Published: 3 April 2012
PDF: 15 pages
Proc. SPIE 8345, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012, 834509 (3 April 2012); doi: 10.1117/12.917540
Show Author Affiliations
Daniele Zonta, Univ. of Trento (Italy)
Paolo Esposito, Univ. of Trento (Italy)
Marco Molignoni, Univ. of Trento (Italy)
Matteo Pozzi, Univ. of Trento (Italy)
Riccardo Zandonini, Univ. of Trento (Italy)
Ming Wang, Northeastern Univ. (United States)
Yang Zhao, Intelligent Instrument System, Inc. (United States)
Daniele Inaudi, Smartec S.A. (Switzerland)
Daniele Posenato, Smartec S.A. (Switzerland)
Branko Glisic, Univ. of Princeton (United States)

Published in SPIE Proceedings Vol. 8345:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012
Masayoshi Tomizuka; Chung-Bang Yun; Jerome P. Lynch, Editor(s)

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