MATEC Web Conf.
Volume 138, 2017The 6th International Conference of Euro Asia Civil Engineering Forum (EACEF 2017)
|Number of page(s)||8|
|Published online||30 December 2017|
Quick Assessment of the Anomalies in Concrete Structure Using Dispersive Characteristic of Surface wave
Department of Construction Engineering, Chaoyang University of Technology, Taichung, Taiwan
A waveform generated by a small impact hammer and recorded by single transducer is used to assess different kinds of anomalies in concrete. Using Short-Time Fourier Transform and the reassignment technique, the group slowness spectrogram can be calculated from the waveform. The surface wave response in the diagram of velocity vs. wavelength corresponding to the reassigned spectrogram is used for defect evaluation. Experiments were conduct on a concrete plate specimen containing multiple delaminated cracks, and a honeycomb. The group velocity profiles for test lines passing through different kinds of defects were obtained and compared. It was found the surface wave velocity begins to decrease with the increase of wavelength when the wavelength is about two times of the depth of the defect.
© The Authors, published by EDP Sciences, 2017
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
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