Abstract
A comprehensive experimental study and three corresponding numerical analyses were conducted to investigate the suitability of a modal analysis approach for identification of unknown pile embedment lengths. A small-scale pile facility containing partially embedded piles of differing lengths, cross section dimensions, and encasement attributes was constructed so that experimental pile response data could be gathered in a controlled laboratory environment. Impact tests were performed at a number of locations on each model pile, and the modal parameters for each were estimated from the resulting frequency response function data. Comparison of modal parameters estimated from model piles with similar cross section dimensions and different buried lengths showed essentially no variation in natural frequency as the buried length increased, in the frequency range that was practical to measure. Modal damping values showed a greater variation with pile embedment depth, but no discernable trends were apparent that would allow identification of the embedded length. Results from the numerical studies indicated the same. It was concluded that identification of pile embedment lengths using modal analysis is not a practically feasible task.
Published Version
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