{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,3]],"date-time":"2026-04-03T01:41:46Z","timestamp":1775180506511,"version":"3.50.1"},"reference-count":160,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2025,2,20]],"date-time":"2025-02-20T00:00:00Z","timestamp":1740009600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JSAN"],"abstract":"<jats:p>The structural health monitoring (SHM) of bridge infrastructure has become essential for ensuring safety, serviceability, and long-term functionality amid aging structures and increasing load demands. SHM leverages sensor networks to enable real-time data acquisition, damage detection, and predictive maintenance, offering a more reliable alternative to traditional visual inspection methods. A key challenge in SHM is optimal sensor placement (OSP), which directly impacts monitoring accuracy, cost-efficiency, and overall system performance. This review explores recent advancements in SHM techniques, sensor technologies, and OSP methodologies, with a primary focus on bridge infrastructure. It evaluates sensor configuration strategies based on criteria such as the modal assurance criterion (MAC) and mean square error (MSE) while examining optimisation approaches like the Effective Independence (EI) method, Kinetic Energy Optimisation (KEO), and their advanced variants. Despite these advancements, several research gaps remain. Future studies should focus on scalable OSP strategies for large-scale bridge networks, integrating machine learning (ML) and artificial intelligence (AI) for adaptive sensor deployment. The implementation of digital twin (DT) technology in SHM can enhance predictive maintenance and real-time decision-making, improving long-term infrastructure resilience. Additionally, research on sensor robustness against environmental noise and external disturbances, as well as the integration of edge computing and wireless sensor networks (WSNs) for efficient data transmission, will be critical in advancing SHM applications. This review provides critical insights and recommendations to bridge the gap between theoretical innovations and real-world implementation, ensuring the effective monitoring and maintenance of bridge infrastructure in modern civil engineering.<\/jats:p>","DOI":"10.3390\/jsan14020022","type":"journal-article","created":{"date-parts":[[2025,2,20]],"date-time":"2025-02-20T04:53:39Z","timestamp":1740027219000},"page":"22","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":29,"title":["Optimal Sensor Placement for Structural Health Monitoring: A Comprehensive Review"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6096-2637","authenticated-orcid":false,"given":"Zhiyan","family":"Sun","sequence":"first","affiliation":[{"name":"School of Engineering, RMIT University, 124 La Trobe Street, Melbourne, Victoria, VIC 3000, Australia"}]},{"given":"Mojtaba","family":"Mahmoodian","sequence":"additional","affiliation":[{"name":"School of Engineering, RMIT University, 124 La Trobe Street, Melbourne, Victoria, VIC 3000, Australia"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-5391-8099","authenticated-orcid":false,"given":"Amir","family":"Sidiq","sequence":"additional","affiliation":[{"name":"School of Engineering, RMIT University, 124 La Trobe Street, Melbourne, Victoria, VIC 3000, Australia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9388-3698","authenticated-orcid":false,"given":"Sanduni","family":"Jayasinghe","sequence":"additional","affiliation":[{"name":"School of Engineering, RMIT University, 124 La Trobe Street, Melbourne, Victoria, VIC 3000, Australia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8197-4832","authenticated-orcid":false,"given":"Farham","family":"Shahrivar","sequence":"additional","affiliation":[{"name":"School of Engineering, RMIT University, 124 La Trobe Street, Melbourne, Victoria, VIC 3000, Australia"}]},{"given":"Sujeeva","family":"Setunge","sequence":"additional","affiliation":[{"name":"School of Engineering, RMIT University, 124 La Trobe Street, Melbourne, Victoria, VIC 3000, Australia"}]}],"member":"1968","published-online":{"date-parts":[[2025,2,20]]},"reference":[{"key":"ref_1","unstructured":"Middleton, C., Fidler, P., and Vardanega, P. 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