DOI QR코드

DOI QR Code

A simple approach for quality evaluation of non-slender, cast-in-place piles

  • Received : 2005.01.26
  • Accepted : 2007.03.06
  • Published : 2008.01.25

Abstract

This study proposes a conceptual framework of in-situ vibration tests and analyses for quality appraisal of non-slender, cast-in-place piles with irregular cross-section configuration. It evaluates a frequency index from vibration recordings to a series of impulse loadings that is related to total soil-resistance forces around a pile, so as to assess if the pile achieves the design requirement in terms of bearing capacity. In particular, in-situ pile-vibration tests in sequential are carried out, in which dropping a weight from different heights generates series impulse loadings with low-to-high amplitudes. The high-amplitude impulse is designed in way that the load will generate equivalent static load that is equal to or larger than the designed bearing capacity of the pile. This study then uses empirical mode decomposition and Hilbert spectral analysis for processing the nonstationary, short-period recordings, so as to single out with accuracy the frequency index. Comparison of the frequency indices identified from the recordings to the series loadings with the design-based one would tell if the total soil resistance force remains linear or nonlinear and subsequently for the quality appraisal of the pile. As an example, this study investigates six data sets collected from the in-situ tests of two piles in Taipu water pump project, Jiangshu Province of China. It concludes that the two piles have the actual axial load capacity higher than the designed bearing capacity. The true bearing capacity of the piles under investigation can be estimated with accuracy if the amplitude of impact loadings is further increased and the analyses are calibrated with the static testing results.

Keywords

References

  1. Abu-Hejleh, N, O'Neill, M. W., Hannerman, D. and Atwooll, W. J. (2003), "Improvement of the geotechnical axial design methodology for Colorado's drilled shafts socketed in weak rocks", Colorado Department of Transportation; Report No, CDOT-DTD-R-2003-6.
  2. ASTM D4945-89 (1989), Standard Test Method for High Strain Dynamic Testing of Piles. American Society for Testing and Materials.
  3. Coduto, D.P. (2001) Foundation Design, Principles and Practices, Prentice Hall, Upper.
  4. Saddle River, New Jersey. Goble Rausche Likins and Associates, Inc. (1995), CAPWAP Manual, Ohio, USA.
  5. JGJ 94-94 (1994). Technical Code for Building Pile Foundation, The Ministry of Building and Construction of the People's Republic of China.
  6. JGJ 106-97 (1997), Specification for High Strain Dynamic Testing of Piles, The Ministry of Building and Construction of the People's Republic of China.
  7. Rausche, F., Goble, G. G. and Likins, G. E. (1985), "Dynamic determination of pile capacity", J. Geotech. Eng., 111, 367-383. https://doi.org/10.1061/(ASCE)0733-9410(1985)111:3(367)
  8. Huang, N. E., Zheng, S., Long, S. R., Wu, M. C., Shih, H. H., Zheng, Q., Yen, N-C., Tung, C. C. and Liu, M. H. (1998). "The empirical mode decomposition and Hilbert spectrum for nonlinear and nonstationary time series analysis", Proc. Roy. Soc. Lond., A454, 903-995.
  9. Huang, N. E., Wu, M. L., Long, S. R., Shen, S. P., Wu, W., Gloersen, P. and Fan, K. L. (2003), "A confidence limit for the empirical mode decomposition and Hilbert spectral analysis", Proc. Roy. Soc. London., A459, 2317-2345.
  10. Priestley, M. B. (1981), Spectral Analysis and Time Series, Vol. 2., Multivariate Series, Prediction and Control, Academic Press, London.
  11. Rei, L. Y. (2001), Dynamics of Pile Foundation, Yan-jin Industrial Publisher, Beijing.
  12. Tang, Y. Q. and Yei, W. M. (1999), Handbook of Testing Techniques in Civil Engineering, Tongji university Publisher, Shanghai.
  13. Worden, K. and Tomlinson, G. R. (2001), Nonlinearity in Structural Dynamics - Detection, Identification and Modeling, Institute of Physics Publishing, Bristol and Philadelphia.
  14. Zhang, R., King, R., Olson, L. and Xu, Y. L. (2005a), "Dynamic response of the Trinity River Relief bridge to controlled pile damage: modeling and experimental data analysis comparing Fourier and Hilbert-Huang techniques", J. Sound Vib., 285, 1049-1070. https://doi.org/10.1016/j.jsv.2004.09.032
  15. Zhang, R., Hartzell, S., Liang, J. and Hu, Y. X. (2005b), "An alternative approach to characterize nonlinear site effects", Earthq. Spectra, 21(1), 243-274. https://doi.org/10.1193/1.1853390
  16. Zhang, R. (2006), "Characterizing and quantifying earthquake-induced site nonlinearity", Soil Dyn. Earthq. Eng., 26(8), 799-812. https://doi.org/10.1016/j.soildyn.2005.03.004

Cited by

  1. An analytical approach for free vibration and transient response of functionally graded piezoelectric cylindrical panels subjected to impulsive loads vol.94, pp.5, 2012, https://doi.org/10.1016/j.compstruct.2012.01.009
  2. Broadband vibration control of a structure by using a magnetorheological elastomer-based tuned dynamic absorber vol.40, 2016, https://doi.org/10.1016/j.mechatronics.2016.09.006
  3. Production of magnetizable microparticles from metallurgic slag in argon plasma jet vol.15, pp.3, 2009, https://doi.org/10.1016/j.jiec.2008.12.003
  4. An analytical solution for dynamic behavior of thick doubly curved functionally graded smart panels vol.107, 2014, https://doi.org/10.1016/j.compstruct.2013.07.039
  5. Characterization of cyclic properties of superelastic monocrystalline Cu–Al–Be SMA wires for seismic applications vol.72, 2014, https://doi.org/10.1016/j.conbuildmat.2014.08.065
  6. RE-EXAMINATION OF THICKNESS-RESONANCE- FREQUENCY FORMULA FOR STRUCTURAL INTEGRITY APPRAISAL AND DAMAGE DIAGNOSIS vol.04, pp.01n02, 2012, https://doi.org/10.1142/S1793536912500112
  7. A broadband frequency-tunable dynamic absorber for the vibration control of structures vol.744, 2016, https://doi.org/10.1088/1742-6596/744/1/012167
  8. Stochastic free vibration analysis of smart random composite plates vol.31, pp.5, 2008, https://doi.org/10.12989/sem.2009.31.5.481