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Proceedings Paper

Identifying damage on a bridge deck using vibration-based damage indices derived from limited measurements
Author(s): Abu B. Siddique; Leon D. Wegner; Bruce F. Sparling
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Paper Abstract

Damage induced within the deck of a bridge superstructure produces concomitant changes to its vibration characteristics (notably its natural frequencies and mode shapes). Vibration-based damage detection (VBDD) methods exploit these changes to infer information regarding the nature of the damage. This paper focuses on interpreting the spatial patterns of changes produced in the fundamental mode shape with the goal of determining whether the presence of damage can be reliably detected. The study was carried out under the constraint that mode shapes are derived from limited data, available only at a relatively small number of measurement points on the surface of the bridge deck. A detailed finite element (FE) model of a two-span, slab-on-girder, integral abutment bridge was developed and calibrated to match the measured natural frequencies and mode shapes of a structure located in Saskatoon, Canada. This model was used to simulate the dynamic response of the bridge as various states of small-scale damage were induced at different locations on the deck. The variation of the change in the fundamental mode shape along three longitudinally oriented lines was studied to identify patterns that would allow a reliable determination of whether damage is present and in what region of the bridge it might be located. It is shown that normalizing mode shapes along individual lines separately, rather than along all three lines simultaneously, emphasises localized changes caused by damage, but also magnifies the influence of random measurement noise, making it more difficult to recognize the global spatial patterns indicative of damage.

Paper Details

Date Published: 20 March 2006
PDF: 12 pages
Proc. SPIE 6176, Nondestructive Evaluation and Health Monitoring of Aerospace Materials, Composites, and Civil Infrastructure V, 617611 (20 March 2006); doi: 10.1117/12.660355
Show Author Affiliations
Abu B. Siddique, March Consulting Associates Inc. (Canada)
Leon D. Wegner, Univ. of Saskatchewan (Canada)
Bruce F. Sparling, Univ. of Saskatchewan (Canada)

Published in SPIE Proceedings Vol. 6176:
Nondestructive Evaluation and Health Monitoring of Aerospace Materials, Composites, and Civil Infrastructure V
Aftab A. Mufti; Andrew L. Gyekenyesi; Peter J. Shull, Editor(s)

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