Share Email Print

Proceedings Paper

Damage detection capabilities of strain-based displacement methods in beam-like structures (Conference Presentation)

Paper Abstract

This research presents an evaluation of the damage detection capabilities of displacements calculated from strain measurements in beam-like structure. Displacements can provide useful information for the monitoring and assessment of a bridges health and safety. The displacement of a structure is correlated with the curvature of a structure, so any unusual behavior of the structure that alters the curvature will also affect the displacement of the structure. Additionally, monitoring the displacement of a structure is useful for evaluating service limits as excessive displacement are uncomfortable to users and can cause damage to surrounding structures. Direct displacement monitoring of a real-life structure can be challenging, especially for long-term measurements. Because of this, the focus of this research is on in-direct displacement monitoring using strain-based displacement estimation methods with FBG strain sensors. A numerical analysis was initially performed to evaluate the potential of the methods, which illustrated the damage detection capabilities for a strain-based displacement method. Additionally, small-scale laboratory tests were performed using an aluminum beam instrumented with FBG strain sensors. The beam was tested under static and dynamic loading conditions as well as a cantilever and simply supported boundary conditions. Increasing levels of damage were applied to the beam by reducing the cross-section of the beam in one location to represent a crack. Both an evaluation of the method for damage sensitivity and a comparison with additional strain-based damage detection methods are performed.

Paper Details

Date Published: 1 April 2019
Proc. SPIE 10972, Health Monitoring of Structural and Biological Systems XIII, 109721H (1 April 2019); doi: 10.1117/12.2515385
Show Author Affiliations
Kaitlyn S. Kliewer, Princeton Univ. (United States)
Branko Glisic, Princeton Univ. (United States)

Published in SPIE Proceedings Vol. 10972:
Health Monitoring of Structural and Biological Systems XIII
Paul Fromme; Zhongqing Su, Editor(s)

© SPIE. Terms of Use
Back to Top
Sign in to read the full article
Create a free SPIE account to get access to
premium articles and original research
Forgot your username?