Development of a wireless strain node and the software to monitor fracture-critical bridges

Jeremiah Fasl; Vasileios Samaras; Matt Reichenbach; Todd Helwig; Sharon L. Wood; David Potter; Richard Lindenberg; Karl Frank

doi:10.1117/12.915071

4 April 2012 Development of a wireless strain node and the software to monitor fracture-critical bridges

Jeremiah Fasl, Vasileios Samaras, Matt Reichenbach, Todd Helwig, Sharon L. Wood, David Potter, Richard Lindenberg, Karl Frank

Author Affiliations +

Proceedings Volume 8347, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2012; 83471R (2012) https://doi.org/10.1117/12.915071
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2012, San Diego, California, United States

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.

Citation Download Citation

Jeremiah Fasl, Vasileios Samaras, Matt Reichenbach, Todd Helwig, Sharon L. Wood, David Potter, Richard Lindenberg, and Karl Frank "Development of a wireless strain node and the software to monitor fracture-critical bridges", Proc. SPIE 8347, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2012, 83471R (4 April 2012); https://doi.org/10.1117/12.915071

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