Identification of minute damage in composite bridge structures equipped with fiber optic sensors using the location of neutral axis and finite element analysis

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

2 Scopus citations

Abstract

By definition, the neutral axis of a loaded composite beam structure is the curve along which the section experiences zero bending strain. When no axial loading is present, the location of the neutral axis passes through the centroid of stiffness of the beam cross-section. In the presence of damage, the centroid of stiffness, as well as the neutral axis, shift from the healthy position. The concept of neutral axis can be widely applied to all beam-like structures. According to literature, a change in location of the neutral axis can be associated with damage in the corresponding cross-section. In this paper, the movement of neutral axis near locations of minute damage in a composite bridge structure was studied using finite element analysis and experimental results. The finite element model was developed based on a physical scale model of a composite simply-supported structure with controlled minute damage in the reinforced concrete deck. The structure was equipped with long-gauge fiber optic strain and temperature sensors at a healthy reference location as well as two locations of damage. A total of 12 strain sensors were installed during construction and used to monitor the structure during various loading events. This paper aims to explain previous experimental results which showed that the observed positions of neutral axis near damage locations were higher than the predicted healthy locations in some loading events. Analysis has shown that finite element analysis has potential to simulate and explain the physical behavior of the test structure.

Original languageEnglish (US)
Title of host publicationHealth Monitoring of Structural and Biological Systems 2016
EditorsTribikram Kundu
PublisherSPIE
ISBN (Electronic)9781510600461
DOIs
StatePublished - Jan 1 2016
EventHealth Monitoring of Structural and Biological Systems 2016 - Las Vegas, United States
Duration: Mar 21 2016Mar 24 2016

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9805
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherHealth Monitoring of Structural and Biological Systems 2016
CountryUnited States
CityLas Vegas
Period3/21/163/24/16

All Science Journal Classification (ASJC) codes

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

Keywords

  • composite bridge structure
  • finite element analysis
  • long-gauge fiber optic sensors
  • minute damage detection
  • neutral axis
  • structural health monitoring

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  • Cite this

    Li, X., & Glisic, B. (2016). Identification of minute damage in composite bridge structures equipped with fiber optic sensors using the location of neutral axis and finite element analysis. In T. Kundu (Ed.), Health Monitoring of Structural and Biological Systems 2016 [980524] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9805). SPIE. https://doi.org/10.1117/12.2219138