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Multi-sensor measurement of dynamic deflections and structural health monitoring of flexible and stiff bridges

Multi-sensor measurement of dynamic deflections and structural health monitoring of flexible and... GPS has been extensively used in measurement of displacements of long, flexible bridges, but we summarize evidence that geodetic instruments, GPS (GNSS) and RTS (robotic total stations), in combination with accelerometers, can be used to measure with safety semi-static and dynamic deflections of stiff bridges with main natural frequencies >  1–3 Hz. This is possible through a methodology derived from controlled, supervised learning experiments, field evidence and structural constraints. This methodology permits to understand the noise characteristics of dynamic displacement measurements and to develop techniques to suppress their noise, and has the following characteristics: (i) it is based on redundant/collocated sensors in order to control measurement uncertainty, avoid blunders and compensate for weaknesses inherent in each type of sensor; (ii) focusses on controlled excitations with structural/logical constraints, mostly free attenuating oscillations leading to direct estimation of first modal frequencies. This methodology was applied, refined, validated and exemplified in the study of several types of bridges in Greece, covering among others, cases of progressive decay and of soil-structure interactions. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Bridge Structures IOS Press

Multi-sensor measurement of dynamic deflections and structural health monitoring of flexible and stiff bridges

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Publisher
IOS Press
Copyright
Copyright © 2019 © 2019 – IOS Press and the authors. All rights reserved
ISSN
1573-2487
eISSN
1744-8999
DOI
10.3233/BRS-190152
Publisher site
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Abstract

GPS has been extensively used in measurement of displacements of long, flexible bridges, but we summarize evidence that geodetic instruments, GPS (GNSS) and RTS (robotic total stations), in combination with accelerometers, can be used to measure with safety semi-static and dynamic deflections of stiff bridges with main natural frequencies >  1–3 Hz. This is possible through a methodology derived from controlled, supervised learning experiments, field evidence and structural constraints. This methodology permits to understand the noise characteristics of dynamic displacement measurements and to develop techniques to suppress their noise, and has the following characteristics: (i) it is based on redundant/collocated sensors in order to control measurement uncertainty, avoid blunders and compensate for weaknesses inherent in each type of sensor; (ii) focusses on controlled excitations with structural/logical constraints, mostly free attenuating oscillations leading to direct estimation of first modal frequencies. This methodology was applied, refined, validated and exemplified in the study of several types of bridges in Greece, covering among others, cases of progressive decay and of soil-structure interactions.

Journal

Bridge Structures – IOS Press

Published: Jan 1, 2019

References

  • Operational deformations in long-span bridges
    Brownjohn
  • Long-term monitoring and data analysis of the Tamar Bridge
    Cross
  • The London Millennium Footbridge
    Dallard