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Detection of defects in FRP-reinforced concrete with the acoustic-laser vibrometry method

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dc.contributor.advisor Oral Büyüköztürk and Robert W. Haupt. en_US
dc.contributor.author Chen, Justin Gejune en_US
dc.contributor.other Massachusetts Institute of Technology. Department of Civil and Environmental Engineering. en_US
dc.date.accessioned 2013-07-09T19:25:02Z
dc.date.available 2013-07-09T19:25:02Z
dc.date.copyright 2013 en_US
dc.date.issued 2013 en_US
dc.identifier.uri http://hdl.handle.net/1721.1/79423
dc.description Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2013. en_US
dc.description This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections. en_US
dc.description Cataloged from student-submitted PDF version of thesis. en_US
dc.description Includes bibliographical references (p. 165-168). en_US
dc.description.abstract 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. en_US
dc.description.statementofresponsibility by Justin Gejune Chen. en_US
dc.format.extent 168 p. en_US
dc.language.iso eng en_US
dc.publisher Massachusetts Institute of Technology en_US
dc.rights 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. en_US
dc.rights.uri http://dspace.mit.edu/handle/1721.1/7582 en_US
dc.subject Civil and Environmental Engineering. en_US
dc.title Detection of defects in FRP-reinforced concrete with the acoustic-laser vibrometry method en_US
dc.title.alternative Detection of defects in fiber-reinforced polymer-reinforced concrete with the acoustic-laser vibrometry method en_US
dc.type Thesis en_US
dc.description.degree S.M. en_US
dc.contributor.department Massachusetts Institute of Technology. Department of Civil and Environmental Engineering. en_US
dc.identifier.oclc 849647432 en_US


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