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Proceedings Paper

Development of a wireless strain node and the software to monitor fracture-critical bridges
Author(s): Jeremiah Fasl; Vasileios Samaras; Matt Reichenbach; Todd Helwig; Sharon L. Wood; David Potter; Richard Lindenberg; Karl Frank
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Paper Abstract

Real-time, monitoring systems can enhance the bridge inspection process by providing data for estimating the health of the bridge and potentially notifying bridge owners of problems between inspection visits. A low-power, wireless, strain data acquisition device has recently been developed to acquire dynamic strain data. Strain gages can be used to monitor the number and size of stress cycles in fatigue-sensitive members. From the cycle count, Palmgren-Miner's rule can be used to determine an effective stress range. The remaining fatigue life can then be calculated and compared to existing conditions and the age of the bridge. Because damage is expected to escalate over time, more frequent inspections may be needed when a bridge approaches its fatigue life. The strain node can be programmed in LabVIEW WSN to detect critical events or perform a rainflow analysis. To aid in system interaction, a software interface will be designed to allow for automated processing and transmission of data to a cloud server, thereby allowing engineers and bridge owners to access the data from anywhere so as to make informed decisions when prioritizing inspections. This paper will present the development of the strain node and the software interface.

Paper Details

Date Published: 5 April 2012
PDF: 7 pages
Proc. SPIE 8347, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2012, 83471R (5 April 2012); doi: 10.1117/12.915071
Show Author Affiliations
Jeremiah Fasl, The Univ. of Texas at Austin (United States)
Vasileios Samaras, The Univ. of Texas at Austin (United States)
Matt Reichenbach, The Univ. of Texas at Austin (United States)
Todd Helwig, The Univ. of Texas at Austin (United States)
Sharon L. Wood, The Univ. of Texas at Austin (United States)
David Potter, National Instruments Corp. (United States)
Richard Lindenberg, Wiss, Janney, Elstner Associates, Inc. (United States)
Karl Frank, Hirschfeld Industries (United States)


Published in SPIE Proceedings Vol. 8347:
Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2012
Andrew L. Gyekenyesi, Editor(s)

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