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Proceedings Paper

Damage detection in bridges through fiber optic structural health monitoring
Author(s): J. D. Doornink; B. M. Phares; T. J. Wipf; D. L. Wood
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Paper Abstract

A fiber optic structural health monitoring (SHM) system was developed and deployed by the Iowa State University (ISU) Bridge Engineering Center (BEC) to detect gradual or sudden damage in fracture-critical bridges (FCBs). The SHM system is trained with measured performance data, which are collected by fiber optic strain sensors to identify typical bridge behavior when subjected to ambient traffic loads. Structural responses deviating from the trained behavior are considered to be signs of structural damage or degradation and are identified through analytical procedures similar to control chart analyses used in statistical process control (SPC). The demonstration FCB SHM system was installed on the US Highway 30 bridge near Ames, IA, and utilizes 40 fiber bragg grating (FBG) sensors to continuously monitor the bridge response when subjected to ambient traffic loads. After the data is collected and processed, weekly evaluation reports are developed that summarize the continuous monitoring results. Through use of the evaluation reports, the bridge owner is able to identify and estimate the location and severity of the damage. The information presented herein includes an overview of the SHM components, results from laboratory and field validation testing on the system components, and samples of the reduced and analyzed data.

Paper Details

Date Published: 20 October 2006
PDF: 12 pages
Proc. SPIE 6371, Photonic Sensing Technologies, 637102 (20 October 2006); doi: 10.1117/12.686011
Show Author Affiliations
J. D. Doornink, Iowa State Univ. (United States)
B. M. Phares, Iowa State Univ. (United States)
T. J. Wipf, Iowa State Univ. (United States)
D. L. Wood, Iowa State Univ. (United States)

Published in SPIE Proceedings Vol. 6371:
Photonic Sensing Technologies
Michael A. Marcus; Brian Culshaw; John P. Dakin, Editor(s)

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