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http://dx.doi.org/10.12989/sss.2017.19.5.513

Application of wavelet transform for the impulse response of pile  

Ni, Sheng-Huoo (Department of Civil Engineering, National Cheng Kung University)
Yang, Yu-Zhang (Department of Civil Engineering, National Cheng Kung University)
Lyu, Chia-Rong (Department of Civil Engineering, National Cheng Kung University)
Publication Information
Smart Structures and Systems / v.19, no.5, 2017 , pp. 513-521 More about this Journal
Abstract
The purpose of this paper is to study the capabilities of the impulse response method in length and flaw detecting for concrete piles and provide a suggested method to find small-size flaws in piles. In this work, wavelet transform is used to decompose the recorded time domain signal into a series of levels. These levels are narrowband, so the mix of different dominant bandwidths can be avoided. In this study, the impulse response method is used to analyze the signal obtained from the wavelet transform to improve the judgment of the flaw signal so as to detect the flaw location. This study provides a new way of thinking in non-destructive testing detection. The results show that the length of a pile is easy to be detected in the traditional reflection time or frequency domain method. However, the small flaws within pile are difficult to be found using these methods. The proposed approach in this paper is able to greatly improve the results of small-size flaw detection within piles by reducing the effects of any noise and clarifying the signal in the frequency domains.
Keywords
piles; impulse response method; signal processing; wavelet transform; non-destructive testing;
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Times Cited By KSCI : 1  (Citation Analysis)
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1 Addison, P.S. (2002), The Illustrated Wavelet Transform Handbook, Institute of Physics.
2 Baker Jr., C.N., Drumright, E.E., Mensah, F., Parikh, G. and Ealy, C. (1991), "Use of nondestructive testing to evaluate defects in drilled shafts", Transportation Research Record, 1331, 28-35.
3 Beheshti-Aval, S.B., Taherinasab, M. and M. Noori, M. (2011), "Using harmonic class loading for damage identification of plates by wavelet transformation approach", Smart Struct. Syst., 8(3), 253-274.   DOI
4 Berger, J.A. and Cotton, D.M. (1990), "Low strain integrity testing of deep foundations", Proceedings of the 5th Annual Members' Conference, Seattle.
5 Briaud, J.L., Ballouz, M. and Nasr, G. (2002), "Defect and length predictions by NDT methods for nine bored piles", International Perspective on Theory, Design, Construction, and Performance, Orlando, Florida, USA.
6 Fei, K., Liu, H.L. and Zhang, T. (2007), "Three-dimensional effects in low strain integrity test of PCC pile", Rock Soil Mech., 28, 1095-1102.
7 Finno, R.J. and Gassman, S.L. (1998a), "Evaluation of bridge foundations by impulse response methods", Structural Materials Technology III, San Antonio, Texas, USA.
8 Finno, R.J. and Gassman, S.L. (1998b), "Impulse response evaluation of drilled shafts", Journal of Geotechnical and Geoenvironmental Engineering, 124 (10), 965-975.   DOI
9 Harrell, A.S. and Stokoe, K.H., II, (1984), Integrity Evaluation of Drilled Piers by Stress Waves, Transportation Research Center, The University of Taxes at Austin.
10 Hartung, M., Meier, K. and Rodatz, W. (1992), "Integrity testing on model pile", Proceedings of the 4th International Conference on the Application of Stress-Wave Theory to Piles, Netherlands.
11 Huang, Y.H., Ni, S.H., Lo, K.F. and Charn, J.Y. (2010), "Assessment of identifiable defect size in a drilled shaft using sonic echo method: Numerical simulation", Comput. Geotech., 37(6), 757-765.   DOI
12 Huang, Y.H. (2011), "Evaluation of the stress wave techniques for the integrity test of pile foundations", Ph. D. Dissertation, Natl. Cheng Kung Univ., Tainan, Taiwan.
13 Iskander, M., Roy, D., Kelley, S. and Ealy, C. (2003), "Drilled shaft defects: detection, and effects on capacity in varved clay", J. Geotech. Geoenviron. Eng. - ASCE, 129(12), 1128-1137.   DOI
14 Kim, D.S., Kim, H.W. and Kim, W.C. (2002), "Parametric study on the impact-echo method using mock-up shafts", NDT&E Int., 35(8), 595-608.   DOI
15 Kim, D.S. and Kim, H.W. (2004), "Evaluation of the base condition of drilled shafts by the impact-echo method", Geotech. Test. J., 27(5), 496-503.
16 Lin, Y., Sansalone, M. and Carino, N.J. (1991), "Impact-echo response of concrete shafts", Geotech. Test. J., 14 (2), 121-137.   DOI
17 Newland, D.E. (1999), "Ridge and phase identification in the frequency analysis of transient signals by harmonic wavelets", J. Vib. Acoust., 121(2), 149-155.   DOI
18 Malhotra, V.M. (1976), Testing Hardened Concrete: Nondestructive Methods, Iowa State University Press.
19 Mallat, S. (1999), A wavelet tour of Signal Processing. Academic, San Diego, 2nd edition.
20 Misiti, M., Misiti, Y., Oppenheim, G. and Poggi, J.M., (Eds.) (2007), Wavelets and Their Applications, ISTE Ltd., DSP series.
21 Ni, S.H., Huang, Y.H. and Lo, K.F. (2011), "Estimating the flaw size in drilled shafts using an impulse response method", J. Civil Eng. - KSCE, 38(1), 127-132.
22 Ni, S.H., Isenhower, W.M. and Huang, Y.H. (2012), "CWT technique for low-strain integrity testing of deep drilled shafts", J. Geoeng., 7(3), 97-105.
23 Park, H.C. and Kim, D.S. (2001), "Evaluation of the dispersive phase and group velocities using harmonic wavelet transform", NDT & E Int., 34(7), 457-467.   DOI
24 Sarhan, H.A., O'Neill, M.W. and Hassan, K.M. (2002), "Flexural performance of drilled shafts with minor flaws in stiff clay", J. Geotech. Geoenviron. Eng., 128(12), 974-985.   DOI
25 Stain, R.T. (1982), "Integrity testing", Civil Engineering, April, 53-59.