Vibrational characteristics of FRP-bonded concrete interfacial defects in a low frequency regime

Tin Kei Cheng; Denvid Lau

doi:10.1117/12.2044860

10 April 2014 Vibrational characteristics of FRP-bonded concrete interfacial defects in a low frequency regime

Tin Kei Cheng, Denvid Lau

Author Affiliations +

Proceedings Volume 9063, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2014; 90630R (2014) https://doi.org/10.1117/12.2044860
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2014, San Diego, California, United States

Abstract

As externally bonded fiber-reinforced polymer (FRP) is a critical load-bearing component of strengthened or retrofitted civil infrastructures, the betterment of structural health monitoring (SHM) methodology for such composites is imperative. Henceforth the vibrational characteristics of near surface interfacial defects involving delamination and trapped air pockets at the FRP-concrete interface are investigated in this study using a finite element approach. Intuitively, due to its lower interfacial stiffness compared with an intact interface, a damaged region is expected to have a set of resonance frequencies different from an intact region when excited by acoustic waves. It has been observed that, when excited acoustically, both the vibrational amplitudes and frequency peaks in the response spectrum of the defects demonstrate a significant deviation from an intact FRP-bonded region. For a thin sheet of FRP bonded to concrete with sizable interfacial defects, the fundamental mode under free vibration is shown to be relatively low, in the order of kHz. Due to the low resonance frequencies of the defects, the use of low-cost equipment for interfacial defect detection via response spectrum analysis is highly feasible.

Citation Download Citation

Tin Kei Cheng and Denvid Lau "Vibrational characteristics of FRP-bonded concrete interfacial defects in a low frequency regime", Proc. SPIE 9063, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2014, 90630R (10 April 2014); https://doi.org/10.1117/12.2044860

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