The flexural vibrations of piles during dynamic tests have to be carefully investigated since it is difficult to control the co-axiallity of the ram mass with respect to the neutral axis of the pile. In this paper, we present two case histories of high strain dynamic pile testing where eccentric impacts were generated. First, measured dynamic signals are presented to show the different relationships between quantities measured at the pile head (force, velocity, bending moment and rotation rate). Then, flexural effects on dynamic pile capacity are determined by the Case method to show effects of the impact eccentricity on dynamic bearing capacity.
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