A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Inspection of cables in concrete using guided waves
The French national research program ACTENA (for evaluation of non accessible tendons) aims at developing non destructive methods for monitoring prestressing steel tendons in civil works. In this program, the use of ultrasonic methods for the detection and location of fractures in tensioned tendons embedded in grout is investigated. These methods are based on guided waves generated from the end of the tendons. In this context, the CEA LIST has developed simulation tools for predicting guided wave inspections. These tools are based on the Semi-Analytical Finite Element (SAFE) technique, allowing one to calculate modes in a guide of arbitrary section. Both the radiation and the reception by a transducer and the scattering by a normal crack are accounted for in the simulation. Inspection methods based on phased arrays techniques have been developed to optimize the selection of one single mode. Application of these mode selection methods on bars has been studied by simulation and subsequently experimentally validated. Experiments have also been performed on strand tendons. Modes favorable to the propagation in the central wire have been identified and have proved to be emitted efficiently with a standard transducer.
Inspection of cables in concrete using guided waves
The French national research program ACTENA (for evaluation of non accessible tendons) aims at developing non destructive methods for monitoring prestressing steel tendons in civil works. In this program, the use of ultrasonic methods for the detection and location of fractures in tensioned tendons embedded in grout is investigated. These methods are based on guided waves generated from the end of the tendons. In this context, the CEA LIST has developed simulation tools for predicting guided wave inspections. These tools are based on the Semi-Analytical Finite Element (SAFE) technique, allowing one to calculate modes in a guide of arbitrary section. Both the radiation and the reception by a transducer and the scattering by a normal crack are accounted for in the simulation. Inspection methods based on phased arrays techniques have been developed to optimize the selection of one single mode. Application of these mode selection methods on bars has been studied by simulation and subsequently experimentally validated. Experiments have also been performed on strand tendons. Modes favorable to the propagation in the central wire have been identified and have proved to be emitted efficiently with a standard transducer.
Inspection of cables in concrete using guided waves
Prüfung von Drahtseilen in Beton mittels geführter Wellen
Jezzine, Karim (author) / Lhemery, Alain (author) / Paris, Olivia (author)
2009
6 Seiten, 3 Bilder, 1 Tabelle, 9 Quellen
(nicht paginiert)
Conference paper
Storage medium
English
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