A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Microwave remote sensing of vibrating stay cables
The paper is focused on the application of microwave remote sensing to the measurement of dynamic deflections on the cables of two cable-stayed bridges. The radar technique allows to simultaneously measure the dynamic response of several stay-cables and provides a powerful and easy-to-use form of systematic and accurate evaluation of natural frequencies and cable tensions. More specifically, the results presented in the paper clearly highlight that: A large number of local resonant frequencies can be identified from radar data on each stay-cable of an array and these natural frequencies seems as accurate as that obtained with conventional accelerometers. In the investigated case studies, the number of frequencies identified from radar data was large enough to establish if the cables behave as a taut string or deviate from a taut string, so that accurate estimate of the cable tensions can be retrieved from the identified natural frequencies as well. The radar survey seems especially suitable to SHM of the stay cables. Furthermore, microwave remote sensing provides the deflection time-history of a stay-cable and could be used to directly evaluate the susceptibility of cables to large amplitude oscillations or the efficiency of devices (e.g., external dampers) adopted to prevent excessive vibrations.
Microwave remote sensing of vibrating stay cables
The paper is focused on the application of microwave remote sensing to the measurement of dynamic deflections on the cables of two cable-stayed bridges. The radar technique allows to simultaneously measure the dynamic response of several stay-cables and provides a powerful and easy-to-use form of systematic and accurate evaluation of natural frequencies and cable tensions. More specifically, the results presented in the paper clearly highlight that: A large number of local resonant frequencies can be identified from radar data on each stay-cable of an array and these natural frequencies seems as accurate as that obtained with conventional accelerometers. In the investigated case studies, the number of frequencies identified from radar data was large enough to establish if the cables behave as a taut string or deviate from a taut string, so that accurate estimate of the cable tensions can be retrieved from the identified natural frequencies as well. The radar survey seems especially suitable to SHM of the stay cables. Furthermore, microwave remote sensing provides the deflection time-history of a stay-cable and could be used to directly evaluate the susceptibility of cables to large amplitude oscillations or the efficiency of devices (e.g., external dampers) adopted to prevent excessive vibrations.
Microwave remote sensing of vibrating stay cables
Gentile, Carmelo (author)
2010
11 Seiten, 12 Bilder, 2 Tabellen, 16 Quellen
Conference paper
English
Remote monitoring of bridge stay cables
| British Library Conference Proceedings | 2007
| Wiley | 2012
Dynamic Measurement on Stay-Cables Using Microwave Interferometry
| British Library Conference Proceedings | 2010
Advanced Composite Stay Cables
| British Library Conference Proceedings | 1996