Frequency Dependence of Piles' Dynamic Stiffness
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Technical Brief 6: The evaluation of the dynamic behavior of deep foundations for Turbomachinery Modules is not a simple task due to uncertainties in the evaluation of the soil shear modulus and the approximations introduced with published literature formulas for complex stiffness (impedance) functions of piles. The direct measurement of the dynamic response of full scale piles can be an efficient method to reduce considerably these uncertainties and to get a reliable evaluation of the dynamic response of deep foundations. The above should also positively impact both the risks and the engineering schedule in the execution phase of the projects, reducing the dynamic analysis cases. The authors present herein the results of full-scale dynamic tests on piles, which have been performed by applying sinusoidal forces to their top.
Giancotti, Marco; Margiotta, Alessio; Orlando, Maurizio; Spinelli, Paolo (2016). Frequency Dependence of Piles' Dynamic Stiffness. Turbomachinery Laboratories, Texas A&M Engineering Experiment Station. Available electronically from