Title: An experimental research on three-dimensional waves in a concrete panel

Authors: Helsin Wang, Ta-Peng Chang, Richard J. Finno

Addresses: Department of Construction Engineering, National Taiwan University of Science and Technology, No. 43 Section 4, Keelung Road, Taipei 10672, Taiwan. ' Department of Construction Engineering, National Taiwan University of Science and Technology, No. 43 Section 4, Keelung Road, Taipei 10672, Taiwan. ' Department of Civil and Environmental Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3109, USA

Abstract: An experimental verification of three-dimensional waves is performed to determine the correct group velocity of guided wave in a concrete panel used as part of precast structural diaphragm walls. A frequency-controlled method is applied to induce the guided wave with central frequency as high as 25 kHz in the concrete panel. The measured acceleration waveforms are transformed into spectrograms with the joint time-frequency analysis. A mode identification method is then developed in which the experimental data associated with dispersive group velocity are plotted and compared with the theoretical group velocity-frequency plot to determine the correct dispersion modes and its corresponding group velocities among these induced waves. Experimental results show the validity of the proposed method. Such method has the potential for use as a non-destructive testing technique to assess the material quality of concrete panel.

Keywords: three-dimensional waves; 3-D waves; frequency controlled method; mode identification; joint time-frequency analysis; JTFA; dispersive group velocity; mode attributes; Rayleigh-Lamb waves; guided waves; nondestructive testing; NDT; concrete; concrete panels; precast structural diaphragm walls.

DOI: 10.1504/IJMPT.2011.040295

International Journal of Materials and Product Technology, 2011 Vol.41 No.1/2/3/4, pp.178 - 190

Published online: 28 Feb 2015 *

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