Monitoring of prestress losses using long-gauge fiber optic sensors

Hiba Abdel-Jaber, Branko Glisic

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

Abstract

Prestressed concrete has been increasingly used in the construction of bridges due to its superiority as a building material. This has necessitated better assessment of its on-site performance. One of the most important indicators of structural integrity and performance of prestressed concrete structures is the spatial distribution of prestress forces over time, i.e. prestress losses along the structure. Time-dependent prestress losses occur due to dimensional changes in the concrete caused by creep and shrinkage, in addition to strand relaxation. Maintaining certain force levels in the strands, and thus the concrete cross-sections, is essential to ensuring stresses in the concrete do not exceed design stresses, which could cause malfunction or failure of the structure. This paper presents a novel method for monitoring prestress losses based on long-gauge fiber optic sensors embedded in the concrete during construction. The method includes the treatment of varying environmental factors such as temperature to ensure accuracy of results in on-site applications. The method is presented as applied to a segment of a post-tensioned pedestrian bridge on the Princeton University campus, Streicker Bridge. The segment is a three-span continuous girder supported on steel columns, with sensors embedded at key locations along the structure during construction in October 2009. Temperature and strain measurements have been recorded intermittently since construction. The prestress loss results are compared to estimates from design documents.

Original languageEnglish (US)
Title of host publicationHealth Monitoring of Structural and Biological Systems 2017
EditorsTribikram Kundu
PublisherSPIE
ISBN (Electronic)9781510608252
DOIs
StatePublished - Jan 1 2017
EventHealth Monitoring of Structural and Biological Systems 2017 - Portland, United States
Duration: Mar 26 2017Mar 29 2017

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10170
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherHealth Monitoring of Structural and Biological Systems 2017
CountryUnited States
CityPortland
Period3/26/173/29/17

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Keywords

  • FBG sensors
  • Post-tensioned
  • Prestress loss
  • Prestressed concrete
  • Structural health monitoring

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  • Cite this

    Abdel-Jaber, H., & Glisic, B. (2017). Monitoring of prestress losses using long-gauge fiber optic sensors. In T. Kundu (Ed.), Health Monitoring of Structural and Biological Systems 2017 [101702P] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10170). SPIE. https://doi.org/10.1117/12.2260103