Damage detection in bridges through fiber optic structural health monitoring

J. D. Doornink; B. M. Phares; T. J. Wipf; D. L. Wood

doi:10.1117/12.686011

20 October 2006 Damage detection in bridges through fiber optic structural health monitoring

J. D. Doornink, B. M. Phares, T. J. Wipf, D. L. Wood

Proceedings Volume 6371, Photonic Sensing Technologies; 637102 (2006) https://doi.org/10.1117/12.686011
Event: Optics East 2006, 2006, Boston, Massachusetts, United States

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.

Citation Download Citation

J. D. Doornink, B. M. Phares, T. J. Wipf, and D. L. Wood "Damage detection in bridges through fiber optic structural health monitoring", Proc. SPIE 6371, Photonic Sensing Technologies, 637102 (20 October 2006); https://doi.org/10.1117/12.686011

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