Detection of defects in FRP-reinforced concrete with the acoustic-laser vibrometry method
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2013.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2013
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| Online Access: | http://hdl.handle.net/1721.1/79423 |
| _version_ | 1826202820908417024 |
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| author | Chen, Justin Gejune |
| author2 | Oral Büyüköztürk and Robert W. Haupt. |
| author_facet | Oral Büyüköztürk and Robert W. Haupt. Chen, Justin Gejune |
| author_sort | Chen, Justin Gejune |
| collection | MIT |
| description | Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2013. |
| first_indexed | 2024-09-23T12:20:07Z |
| format | Thesis |
| id | mit-1721.1/79423 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T12:20:07Z |
| publishDate | 2013 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/794232019-04-11T11:09:51Z Detection of defects in FRP-reinforced concrete with the acoustic-laser vibrometry method Detection of defects in fiber-reinforced polymer-reinforced concrete with the acoustic-laser vibrometry method Chen, Justin Gejune Oral Büyüköztürk and Robert W. Haupt. Massachusetts Institute of Technology. Department of Civil and Environmental Engineering. Massachusetts Institute of Technology. Department of Civil and Environmental Engineering. Civil and Environmental Engineering. Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2013. This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections. Cataloged from student-submitted PDF version of thesis. Includes bibliographical references (p. 165-168). Fiber-reinforced polymer (FRP) strengthening and retrofitting of concrete structural elements has become increasingly popular for civil infrastructure systems. When defects occur in FRP-reinforced concrete elements at the FRP-concrete interface, such as voids or delamination, FRP obscures the defect such that visual detection may not be possible. Most currently available non-destructive testing (NDT) methods rely on physical contact; an NDT method that is capable of remotely assessing damage would be greatly advantageous. A novel approach called the acoustic-laser vibrometry method which is capable of remote assessment of damage in FRP-reinforced concrete, is investigated in this thesis. It exploits the fact that areas where the FRP has debonded from concrete will vibrate excessively compared to intact material. In order to investigate this method, a laboratory system consisting of a commercial laser vibrometer system and conventional loudspeaker was used to perform tests with fabricated FRP-reinforced concrete specimens. The measurement results in the form of resonant frequencies were compared to those determined from theoretical and finite element defect models. With a series of measurements the vibrational mode shapes of defects and extent of the damage were imaged. The feasibility of the method was determined through a series of parametric studies, including sound pressure level (SPL), defect size, laser signal level, and angle of incidence. A preliminary Receiver Operating Characteristic (ROC) curve was determined for the method, and future work involving the acoustic-laser vibrometry method is proposed. by Justin Gejune Chen. S.M. 2013-07-09T19:25:02Z 2013-07-09T19:25:02Z 2013 2013 Thesis http://hdl.handle.net/1721.1/79423 849647432 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 168 p. application/pdf Massachusetts Institute of Technology |
| spellingShingle | Civil and Environmental Engineering. Chen, Justin Gejune Detection of defects in FRP-reinforced concrete with the acoustic-laser vibrometry method |
| title | Detection of defects in FRP-reinforced concrete with the acoustic-laser vibrometry method |
| title_full | Detection of defects in FRP-reinforced concrete with the acoustic-laser vibrometry method |
| title_fullStr | Detection of defects in FRP-reinforced concrete with the acoustic-laser vibrometry method |
| title_full_unstemmed | Detection of defects in FRP-reinforced concrete with the acoustic-laser vibrometry method |
| title_short | Detection of defects in FRP-reinforced concrete with the acoustic-laser vibrometry method |
| title_sort | detection of defects in frp reinforced concrete with the acoustic laser vibrometry method |
| topic | Civil and Environmental Engineering. |
| url | http://hdl.handle.net/1721.1/79423 |
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