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Materials 2016, 9(6), 437; doi:10.3390/ma9060437

The Simple Lamb Wave Analysis to Characterize Concrete Wide Beams by the Practical MASW Test

1
Department of Architecture Engineering, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin 17104, Korea
2
Department of Safety Engineering, Incheon National University, 12-1 Songdo-dong, Yeonsu-Gu, Incheon 22012, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Steven Suib
Received: 9 April 2016 / Revised: 9 May 2016 / Accepted: 27 May 2016 / Published: 2 June 2016
(This article belongs to the Special Issue Acoustic Waves in Advanced Materials)
View Full-Text   |   Download PDF [6941 KB, uploaded 2 June 2016]   |  

Abstract

In recent years, the Lamb wave analysis by the multi-channel analysis of surface waves (MASW) for concrete structures has been an effective nondestructive evaluation, such as the condition assessment and dimension identification by the elastic wave velocities and their reflections from boundaries. This study proposes an effective Lamb wave analysis by the practical application of MASW to concrete wide beams in an easy and simple manner in order to identify the dimension and elastic wave velocity (R-wave) for the condition assessment (e.g., the estimation of elastic properties). This is done by identifying the zero-order antisymmetric (A0) and first-order symmetric (S1) modes among multimodal Lamb waves. The MASW data were collected on eight concrete wide beams and compared to the actual depth and to the pressure (P-) wave velocities collected for the same specimen. Information is extracted from multimodal Lamb wave dispersion curves to obtain the elastic stiffness parameters and the thickness of the concrete structures. Due to the simple and cost-effective procedure associated with the MASW processing technique, the characteristics of several fundamental modes in the experimental Lamb wave dispersion curves could be measured. Available reference data are in good agreement with the parameters that were determined by our analysis scheme. View Full-Text
Keywords: Lamb wave; MASW; surface wave; Rayleigh wave; P-wave; condition assessment; concrete; thickness estimation Lamb wave; MASW; surface wave; Rayleigh wave; P-wave; condition assessment; concrete; thickness estimation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Lee, Y.H.; Oh, T. The Simple Lamb Wave Analysis to Characterize Concrete Wide Beams by the Practical MASW Test. Materials 2016, 9, 437.

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