Improvement of the Impact-Echo Method for the Higher Reliability in the Structural Integrity Assessment


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The impact-echo method, which is to evaluate the integrity of concrete and masonry structures nondestructively, is an excellent method in practical applications, and provides a high quality of structural integrity assessment. However, in the case of multi-layered systems in which each layer has different stiffness, the impact-echo method may lack reliability in thickness evaluation, which demands improvement of the impact-echo method. This study was first dedicated to the understanding of stress-wave propagation in the impact-echo test, and secondly, the reliability of the impact-echo method was investigated through the numerical simulation of the impact-echo test. The investigation included the research on influencing factors such as stiffness contrast between layers and receiver location. Finally, the research in this paper led to the development of the phase-difference response (PDR) method, based on the frequency response between two receivers deployed in a line with an impact source.



Key Engineering Materials (Volumes 321-323)

Edited by:

Seung-Seok Lee, Joon Hyun Lee, Ik Keun Park, Sung-Jin Song, Man Yong Choi




M. R. Cho et al., "Improvement of the Impact-Echo Method for the Higher Reliability in the Structural Integrity Assessment", Key Engineering Materials, Vols. 321-323, pp. 336-339, 2006

Online since:

October 2006




[1] M.J. Sansalone, W.B. Streett: IMPACT-ECHO: Nondestructive Evaluation of Concrete and Masonry. Bullbrier Press (1997), p.339.

[2] S. -H. Joh, K.G. Bae, G.J. Nah, S.W. Lee, and S.D. Lee: Feasibility Study of Seismic Measurements for the Safety Assessment of Tunnel Concrete Lining. KGS Fall '98 National Conference (1998), pp.415-422.

[3] E. Kausel and R. Peek: Dynamic loads in the interior of a layered stratum: an explicit solution. Bull. Seismol. Soc. Am. Vol. 72, No. 1 (1982), pp.1259-1508.

[4] M.R. Cho: Development of a Seismic Method for the Nondestructive Integrity Assessment of Concrete Structures. Ph.D. Dissertation, Chung-Ang Unviersity, Korea (2002).

[5] K.H. Stokoe, II, S.G. Wright, J.A. Bay, and J.M. Roesset: Characterization of geotechnical sites by SASW method. Geophysical Characteristics of Sites, ISSMFE, Technical Committee 10 for XIII ICSMFE, International Science Publishers, New York, (1994).