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Damage visualization of imperfectly-grouted sheath in PC structures
In recent years, PC cables' breakage due to corrosion is reported frequently in post-tensioned PC structures. It can be considered that the imperfectly-grouted sheath is the principal cause, leading to eventual failure in the worst case. The techniques to diagnose the imperfectly-grouted sheath in post-tensioned PC structures is thus in high demand. Conventionally NDT such as ultrasonic technique, SIBIE and AE monitoring have been applied for the diagnosing the deterioration of PC structures, but there are still many issues to solve with respect to the accuracy and quantitative evaluation for the degradation, so that the visual check, which is the most reasonable and convenient but can be applied only for the surface deterioration is well used to diagnose, regarding as the representative of the general deterioration in the present circumstances. To solve these issues, the authors have tried to identify the imperfectly-grouted sheath in post-tensioned PC specimens by elastic wave tomography, which has been studied enthusiastically in author's group exhibiting the high-accurate results of damage identification. In order to determine the both of the adequate arrangement of AE sensors and the effective frequency of the elastic wave transmission, numerical simulations were implemented in advance of the experimental approaches. In this paper, the both result of simulation and experiment for imperfectly-grouted sheath, subjected to elastic wave tomography are showed and finally some compatible results could be obtained. As a result, it was possible to identify imperfectly-grouted sheath in the post-tensioned PC specimen by elastic wave tomography. Several issues to improve the accuracy of the elastic wave tomography were cleared successfully in application of the elastic wave tomography for the diagnosis of the grouting condition between the sheath and tendons on in-situ PC structure.
Damage visualization of imperfectly-grouted sheath in PC structures
In recent years, PC cables' breakage due to corrosion is reported frequently in post-tensioned PC structures. It can be considered that the imperfectly-grouted sheath is the principal cause, leading to eventual failure in the worst case. The techniques to diagnose the imperfectly-grouted sheath in post-tensioned PC structures is thus in high demand. Conventionally NDT such as ultrasonic technique, SIBIE and AE monitoring have been applied for the diagnosing the deterioration of PC structures, but there are still many issues to solve with respect to the accuracy and quantitative evaluation for the degradation, so that the visual check, which is the most reasonable and convenient but can be applied only for the surface deterioration is well used to diagnose, regarding as the representative of the general deterioration in the present circumstances. To solve these issues, the authors have tried to identify the imperfectly-grouted sheath in post-tensioned PC specimens by elastic wave tomography, which has been studied enthusiastically in author's group exhibiting the high-accurate results of damage identification. In order to determine the both of the adequate arrangement of AE sensors and the effective frequency of the elastic wave transmission, numerical simulations were implemented in advance of the experimental approaches. In this paper, the both result of simulation and experiment for imperfectly-grouted sheath, subjected to elastic wave tomography are showed and finally some compatible results could be obtained. As a result, it was possible to identify imperfectly-grouted sheath in the post-tensioned PC specimen by elastic wave tomography. Several issues to improve the accuracy of the elastic wave tomography were cleared successfully in application of the elastic wave tomography for the diagnosis of the grouting condition between the sheath and tendons on in-situ PC structure.
Damage visualization of imperfectly-grouted sheath in PC structures
Osawa, Satoshi (Autor:in) / Shiotani, Tomoki (Autor:in) / Kitora, Hisato (Autor:in) / Momiyama, Yoshiyuki (Autor:in)
2014
8 Seiten, Bilder, Tabellen, 6 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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