Direct and indirect Structural Health Monitoring of steel railway bridges: A state-of-the-art review and future challenges
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Zihao Liu
Mehrisadat Alamdari
Rune Schlanbusch
Abstract
Steel railway bridges are a vital part of the transportation infrastructure, and their normal operation is crucial to a functioning society. However, aging bridges are subjected to traffic loads and harsh environmental conditions, which can lead to deterioration mechanisms. When damages caused by such mechanisms reach a critical level, they can lead to catastrophic bridge failures, high maintenance costs, and loss of human lives. Thus, early damage detection, localization, quantification, and the estimation of the remaining useful life of a bridge are crucial. Structural Health Monitoring (SHM) systems based on vibration measurements have been developed for bridge monitoring. SHM is characterized as direct or indirect (drive-by) depending on how the sensors are used. In direct SHM, vibration sensors are mounted on the bridge to measure the response of the bridge as the trains pass, while in indirect SHM, vibration sensors are installed on passing trains to measure the response of the bridge. The high cost for the deployment and maintenance of direct SHM instrumentation across the large number of bridges in a typical railway network limits its scalability, making network-wide deployment economically impractical. As a result, indirect SHM has been explored as a less costly alternative for network-level monitoring, while direct SHM remains highly valuable for critical assets, high-risk structures, and validating indirect monitoring methods. Despite growing interest, the main research gap is the existence of only two review papers on SHM in steel railway bridges, with the studies referred to in the review papers covering only direct SHM and mainly damage detection, localization, and quantification. The goal of the current review article is to address this research gap by reviewing the state-of-the-art in SHM methods applied to steel railway bridges between 2010 and 2025. The state-of-the-art encompasses direct SHM studies with numerical, experimental, and field validation on full-scale bridges, and indirect SHM studies with numerical and field validation on full-scale bridges and experimental validation on laboratory-scaled bridges.} {Within indirect SHM, frequency identification, which recovers bridge natural frequencies from train-mounted sensors, is treated as an enabling monitoring task that supports SHM workflow. In addition, the review article provides recommendations for future challenges.
How to Cite
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Structural Health Monitoring, Steel, Railway bridges, Damage diagnosis, Damage prognosis, Direct, indirect, Direct Structural Health Monitoring, Indirect Structural Health Monitoring, Damage, Detection, Localization, Quantification, Vibration, Bridge, Railway, Train, Drive-by, review
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