Estimation of load redistribution in a cable-stayed bridge using a combination of sensing techniques

Daniele Zonta, Paolo Esposito, Marco Molignoni, Matteo Pozzi, Riccardo Zandonini, Ming Wang, Yang Zhao, Daniele Inaudi, Daniele Posenato, Branko Glisic

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

1 Citation (Scopus)

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.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Place of PublicationBellingham
Volume8345
DOIs
Publication statusPublished - 2012
EventSensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012 - San Diego, CA, United States
Duration: 12 Mar 201215 Mar 2012

Conference

ConferenceSensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012
CountryUnited States
CitySan Diego, CA
Period12/03/1215/03/12

Keywords

  • cable stayed bridge
  • data analysis
  • elasto-magnetic sensor
  • fiber Bragg grating
  • monitoring

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  • Cite this

    Zonta, D., Esposito, P., Molignoni, M., Pozzi, M., Zandonini, R., Wang, M., Zhao, Y., Inaudi, D., Posenato, D., & Glisic, B. (2012). Estimation of load redistribution in a cable-stayed bridge using a combination of sensing techniques. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 8345). [834509]. https://doi.org/10.1117/12.917540