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Open AccessArticle

Comparative Study of Damage Detection Methods Based on Long-Gauge FBG for Highway Bridges

1
Highway College, Chang’an University, Xi’an 710064, China
2
Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University, Nanjing 210096, China
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(13), 3623; https://doi.org/10.3390/s20133623
Received: 4 June 2020 / Revised: 23 June 2020 / Accepted: 26 June 2020 / Published: 28 June 2020
(This article belongs to the Special Issue Fiber Bragg Grating Based Sensors and Systems)
Damage detection of highway bridges is a significant part of structural heath monitoring. Conventional accelerometers or strain gauges utilized for damage detection have many shortcomings, especially their monitoring gauge length being too short, which would result in poor damage detection results. Under this circumstance, long-gauge FBG sensors as a novel optical sensor were developed to measure the macro-strain response of the structure. Based on this sensor, many derived damage detection methods were proposed. These methods exhibit various characteristics and have not been systematically compared. As a result, it is difficult to evaluate the state of the art and also leads to confusion for users to select. Therefore, a strict comparative study on three representative methods using long-gauge FBG was carried out. First, these methods’ theoretical backgrounds and formats were reformulated and unified for better comparison. Then, based on validated vehicle–bridge coupling simulation, these methods’ performances were tested through a series of parametric studies including various damage scenarios, vehicle types, speeds, road roughness and noise levels. The precision and reliability of three methods have been thoroughly studied and compared. View Full-Text
Keywords: long-gauge FBG; damage detection; highway bridges; vehicle–bridge interaction; comparative study long-gauge FBG; damage detection; highway bridges; vehicle–bridge interaction; comparative study
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MDPI and ACS Style

Chen, S.-Z.; Feng, D.-C.; Han, W.-S. Comparative Study of Damage Detection Methods Based on Long-Gauge FBG for Highway Bridges. Sensors 2020, 20, 3623.

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