Title:
Shear Wave Velocity in Concrete Cylinders (Piles)- Universal Mode Method
Author(s):
Richard J. Finno and Hsiao-chou Chao
Publication:
Materials Journal
Volume:
102
Issue:
3
Appears on pages(s):
154-162
Keywords:
Poisson’s ratio; shear; test
DOI:
10.14359/14442
Date:
5/1/2005
Abstract:
To apply three-dimensional theoretical guided wave methods to cylindrical concrete elements in practice, the theoretical solution and experimental results have to be converted to a common baseline by the shear wave velocity cT. Evaluation shows the theoretical solutions are independent of the elastic constants of the concrete and surrounding material at certain frequencies. The solutions at these frequencies are termed the universal mode, and the corresponding frequencies are termed the universal mode frequencies (UMFs). Results of observations indicate that a spike corresponding to the UMF can be identified in the resulting spectrum of a vibration test on a concrete pile, and the cT can be computed from the frequency of this particular spike. The cT derived from this experimental approach is shown to be reasonable by comparing the numerically derived phase velocity dispersion curve and the phase velocities measured at the resonant frequencies.