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EnglishNon-destructive testing (NDT) methods to determine the condition of existing concrete members, such as pre- or post-tensioned beams belonging to concrete bridge decks, are used in assessing the need for preventive maintenance, repair or replacement of the structure. In this work, a prestress force identification method for concrete beams using static deflections is presented. The procedure makes use of the Euler-Bernoulli beam model and it is able to estimate the prestress forces using one or a set of displacements measured along the beam span. The method also requires the knowledge of the flexural rigidity of the element under examination. The deflected shape of a post-tensioned concrete beam, subjected to a three point-bending test, was short-term monitored in several laboratory tests. The accuracy of the deflection measurements allowed to obtain good prestress force estimations. Finally, it was shown that “compression-softening” theory holds for post-tensioned concrete beams with prestress forces satisfying the decompression serviceability limit state. Results of this experimental work will be presented and discussed.
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| Titolo: | Deflection-based measuring method for the prestress force prediction in concrete members | |
| Autori: | ||
| Data di pubblicazione: | 2017 | |
| Abstract: | Non-destructive testing (NDT) methods to determine the condition of existing concrete members, such as pre- or post-tensioned beams belonging to concrete bridge decks, are used in assessing the need for preventive maintenance, repair or replacement of the structure. In this work, a prestress force identification method for concrete beams using static deflections is presented. The procedure makes use of the Euler-Bernoulli beam model and it is able to estimate the prestress forces using one or a set of displacements measured along the beam span. The method also requires the knowledge of the flexural rigidity of the element under examination. The deflected shape of a post-tensioned concrete beam, subjected to a three point-bending test, was short-term monitored in several laboratory tests. The accuracy of the deflection measurements allowed to obtain good prestress force estimations. Finally, it was shown that “compression-softening” theory holds for post-tensioned concrete beams with prestress forces satisfying the decompression serviceability limit state. Results of this experimental work will be presented and discussed. | |
| Handle: | http://hdl.handle.net/11392/2373967 | |
| Appare nelle tipologie: | 04.3 Abstract (Riassunto) in convegno in Rivista/Volume |
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