@inproceedings{82488d5864a3422cba07f8b5000c5930,
title = "Long-term Field Monitoring of Fatigue Cracks for Steel Bridges with Wireless Large-Area Strain Sensors",
abstract = "Steel bridges are susceptible to fatigue damage under traffic loading and many bridges operate with existing cracks. The discovery and long-term monitoring of those fatigue cracks are critical for safety evaluations. In previous studies, the ability of the soft elastomeric capacitor (SEC) sensor that measures large-area strain was validated for detecting and monitoring fatigue crack growth in a laboratory environment. In this study, the performance of the technology is evaluated for field applications, for which an approach for long-term monitoring of fatigue cracks is developed. The approach consists of an integrated system, termed the Wireless Large-Area Strain Sensors (WLASS), for wireless data collection and storage, and an algorithm for monitoring fatigue cracks with bridge response induced by traffic loading. In particular, the WLASS consists of soft elastomeric capacitors (SECs) combined with sensor boards to convert capacitance to a measurable change in voltage and a wireless sensing platform equipped with event-triggered sensing, wireless data collection, cloud storage, and remote data retrieval. A modified crack growth index (CGI) is developed through wavelet transform. Using the measurements from the integrated system, the modified CGI is able to obtain the crack status under impulsive loading events due to traffic. The performance of the developed approach is validated using a steel highway bridge.",
keywords = "fatigue crack monitoring, large-area strain sensor, peak detection, soft elastomeric capacitor, steel bridges, structural health monitoring, traffic loads, wavelet transform, wireless sensors",
author = "Taher, {Sdiq Anwar} and Jian Li and Jeong, {Jong Hyun} and Simon Laflamme and Hongki Jo and Caroline Bennett and William Collins and Han Liu and Austin Downey and Mona Shaheen",
note = "Publisher Copyright: {\textcopyright} 2022 SPIE.; Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2022 ; Conference date: 04-04-2022 Through 10-04-2022",
year = "2022",
doi = "10.1117/12.2613072",
language = "English (US)",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Daniele Zonta and Daniele Zonta and Branko Glisic and Zhongqing Su",
booktitle = "Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2022",
}