16 April 2013 One dimensional predictive model of interfacial stiffness in FRP-bonded concrete system using acoustic-laser technique
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Abstract
Fiber-reinforced polymer (FRP) has become increasingly popular in the application of strengthening and retrofitting existing concrete elements, such as beams, columns, slabs, and bridge decks. In view of the maintenance and the safety issues against these retrofitted systems, development of a robust and reliable nondestructive testing (NDT) technique that provides an accurate and remote assessment of interfacial properties in the FRP-bonded concrete system is required. In this paper, a one dimensional predictive model of interfacial stiffness in the FRP-bonded concrete system based on an acoustic-laser technique is proposed. This model is constructed based on a traditional beam theory in which an infinitely long beam sits on top of a series of springs, which can be regarded as a soft foundation. It is noticed that the resonance frequency can indicate the interfacial stiffness when the size of detected defect is small enough. The result from this predictive model is compared with the existing literature on the interfacial stiffness in epoxy-silica system and a good agreement is observed.
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Denvid Lau, Denvid Lau, } "One dimensional predictive model of interfacial stiffness in FRP-bonded concrete system using acoustic-laser technique", Proc. SPIE 8694, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2013, 86940W (16 April 2013); doi: 10.1117/12.2010251; https://doi.org/10.1117/12.2010251
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