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Smart Structures and Systems Volume 16, Number 2, August 2015 , pages 263-280 DOI: https://doi.org/10.12989/sss.2015.16.2.263 |
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Vibration-based structural health monitoring of stay cables by microwave remote sensing |
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Carmelo Gentile and Alessandro Cabboi
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| Abstract | ||
| Microwave remote sensing is probably the most recent experimental technique suitable to the non-contact measurement of deflections on large structures, in static or dynamic conditions. In the first part of the paper, the main techniques adopted in microwave remote sensing are described, so that advantages and potential issues of these techniques are presented and discussed. Subsequently, the paper addresses the application of the radar technology to the measurement of the vibration response on the stay cables of two cable-stayed bridges. The dynamic tests were performed in operational conditions (i.e. with the excitation being mainly provided by micro-tremors, wind and traffic) and the maximum deflections of the cables were generally lower than 5.0 mm. The investigation clearly highlights: (a) the safe and simple use of the radar on site and its effectiveness to simultaneously measure the dynamic response of all the stay cables of an array; (b) the negligible effects of the typical issues and uncertainties that might affect the radar measurements; (c) the accuracy of the results provided by the microwave remote sensing in terms of natural frequencies and tension forces of the stay cables; (d) the suitability of microwave interferometry to the repeated application within Structural Health Monitoring programmes. | ||
| Key Words | ||
| dynamic testing; microwave remote sensing; radar; stay cable; structural health monitoring | ||
| Address | ||
| Carmelo Gentile: Politecnico di Milano, Department of Architecture, Built environment and Construction engineering (ABC), P.za Leonardo da Vinci 32, 20133 Milan, Italy Alessandro Cabboi: University of Cagliari, Department of Civil and Environmental Engineering and Architecture, Piazza d | ||