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Open AccessArticle

Long-Term In-Service Monitoring and Performance Assessment of the Main Cables of Long-Span Suspension Bridges

by Yang Deng 1,2,*, Yang Liu 1,* and Suren Chen 3
1
School of Civil Engineering and Architecture, Changsha University of Science & Technology, Changsha 410004, China
2
Beijing Advanced Innovation Center for Future Urban Design, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
3
Department of Civil and Environmental Engineering, Colorado State University, Fort Collins, CO 80523, USA
*
Authors to whom correspondence should be addressed.
Sensors 2017, 17(6), 1414; https://doi.org/10.3390/s17061414
Received: 1 May 2017 / Revised: 13 June 2017 / Accepted: 13 June 2017 / Published: 16 June 2017
(This article belongs to the Special Issue Sensor Technologies for Health Monitoring of Composite Structures)
Despite the recent developments in structural health monitoring, there remain great challenges for accurately, conveniently, and economically assessing the in-service performance of the main cables for long-span suspension bridges. A long-term structural health monitoring technique is developed to measure the tension force with a conventional sensing technology and further provide the in-service performance assessment strategy of the main cable. The monitoring system adopts conventional vibrating strings transducers to monitor the tension forces of separate cable strands of the main cable in the anchor span. The performance evaluation of the main cable is conducted based on the collected health monitoring data: (1) the measured strand forces are used to derive the overall tension force of a main cable, which is further translated into load bearing capacity assessment using the concept of safety factor; and (2) the proposed technique can also evaluate the uniformity of tension forces from different cable strands. The assessment of uniformity of strand forces of a main cable offers critical information in terms of potential risks of partial damage and performance deterioration of the main cable. The results suggest the proposed low-cost monitoring system is an option to provide approximate estimation of tension forces of main cables for suspension bridges. With the long-term monitoring data, the proposed monitoring-based evaluation methods can further provide critical information to assess the safety and serviceability performance of main cables. View Full-Text
Keywords: suspension bridge; main cable; tension force; structural health monitoring; vibrating strings transducer; safety factor suspension bridge; main cable; tension force; structural health monitoring; vibrating strings transducer; safety factor
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MDPI and ACS Style

Deng, Y.; Liu, Y.; Chen, S. Long-Term In-Service Monitoring and Performance Assessment of the Main Cables of Long-Span Suspension Bridges. Sensors 2017, 17, 1414.

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