Experimental evaluation of a smart prestressed element instrumented with multiplexed interferometric fiber optic sensors

D. Zonta, M. Pozzi, H. Wu, D. Inaudi

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

1 Citation (Scopus)

Abstract

This paper presents the development and laboratory validation of a fiber opticinstrumented structural element. The sensing technology is based on a multiplexed version of the SOFO strain sensor, prepared in the form of a 3-field smart composite bar; in-line multiplexing is obtained by separating each measurement field through broadband FBGs. The element is a reduced scale reinforced concrete beam, of dimensions 3.8 by 0.5 by 0.3m that can be pre-stressed by an internal Dywidag bar, monitoring the applied load, and is also instrumented with a number of traditional and innovative gauges. The experiment aims to identify the response of the sensors to different damage conditions artificially produced in the element, including cracking and loss of prestressing. A numerical algorithm, based on Bayesian logic, is applied to real-time diagnosis: by processing the sensor measurements and prior information, the method assigns a posterior probability to each assumed damage scenario as well as updated probability distributions to each relevant structural parameter. The paper discusses the ability of the system to identify the different damage conditions.

Original languageEnglish
Title of host publicationProceedings of the 4th European Workshop on Structural Health Monitoring
Pages863-870
Number of pages8
Publication statusPublished - 4 Jul 2008
Event4th European Workshop on Structural Health Monitoring - Cracow, Poland
Duration: 2 Jul 20084 Jul 2008

Conference

Conference4th European Workshop on Structural Health Monitoring
CountryPoland
CityCracow
Period2/07/084/07/08

Keywords

  • structural health monitoring
  • multiplexing
  • building materials
  • concrete products
  • fiber optic sensors
  • monitoring
  • probability distributions
  • numerical methods
  • sensors

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  • Cite this

    Zonta, D., Pozzi, M., Wu, H., & Inaudi, D. (2008). Experimental evaluation of a smart prestressed element instrumented with multiplexed interferometric fiber optic sensors. In Proceedings of the 4th European Workshop on Structural Health Monitoring (pp. 863-870)