Abstract
The constant-velocity one-dimensional (1D) wave theory can be applied to interpret the results of conventional (longitudinal wave) impulse response tests in concrete piles, where the determination of pile lengths relies on the regular frequency information. However, frequency analysis is not currently recommended for flexural wave impulse response tests due to its dispersive characteristics at low frequencies. The assumption of constant wave velocity is only applicable at high frequencies for flexural waves. This paper develops a simple approach to quantitatively determine the lower bound of constant wave velocity for flexural wave impulse response tests performed on seven concrete piles. The resulting frequency analysis indicates that all of the predicted pile lengths ranged within a 5% error in relation to their actual lengths.
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