Response of long-gauge strain sensors in proximity of force application point

Rachel Marek, Branko Glisic

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

Abstract

Strain field distributions within a beam are frequently calculated using linear theory. However, linear beam theory does not provide solutions in the areas close to force application points, due to local strain perturbations caused by the force. Hence, interpretation of strain measurements taken by long-gauge sensors in proximity of force application point is difficult, as the measurements cannot be directly compared with analytical models. In addition, due to perturbation, sensors with different gauge lengths installed at that same location provide different values of measured strain. This paper explores and develops a potential analytical model for strain field perturbation in a beam's regions close to force application points, and investigates the influence of sensor gauge length on strain measurement in these areas. An analytical model derived by Seewald is modified in order to fit the sensor measurements. Based on the model, evaluation of strain measurement is performed taking into account the gauge length of the sensor. Results are validated using data from a real structure, Streicker Bridge at Princeton University campus.

Original languageEnglish (US)
Title of host publicationSensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2018
EditorsKon-Well Wang, Hoon Sohn, Jerome P. Lynch
PublisherSPIE
ISBN (Electronic)9781510616929
DOIs
StatePublished - Jan 1 2018
EventSensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2018 - Denver, United States
Duration: Mar 5 2018Mar 8 2018

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10598
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherSensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2018
CountryUnited States
CityDenver
Period3/5/183/8/18

All Science Journal Classification (ASJC) codes

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

Keywords

  • Long-gauge strain sensors
  • bridge monitoring
  • fiber-optic sensors
  • force application point
  • strain-field perturbation

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  • Cite this

    Marek, R., & Glisic, B. (2018). Response of long-gauge strain sensors in proximity of force application point. In K-W. Wang, H. Sohn, & J. P. Lynch (Eds.), Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2018 [105981H] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10598). SPIE. https://doi.org/10.1117/12.2300889