Torsional Vibrations of Pile Foundations

by Milos Novak, (M.ASCE), Prof. of Engrg. Sci.; Univ. of Western Ontario, London, Canada,
John F. Howell, Grad. Student; Faculty of Civ. Engrg., Univ. of Western Ontario, London, Canada,

Serial Information: Journal of the Geotechnical Engineering Division, 1977, Vol. 103, Issue 4, Pg. 271-285

Document Type: Journal Paper


Figures are presented to facilitate this application and the response of various representative footings to torsional excitation is also shown. For a pile group the contribution of pile twisting to the total response in torsion is usually small. For a single pile or pier torsion can be important and the inclusion of material damping is essential. The following dimensionless parameters govern the soil-pile interaction in torsion: Shear wave velocity ratio, slenderness ratio, mass ratio, dimensionless frequency, and material damping ratio. With increasing shear wave velocity ratio, both pile stiffness and damping increase. For soft soils and pile slenderness ratio greater than 25, the response is independent of the slenderness ratio and the tip condition. Pile foundations can have higher resonant frequencies but smaller resonant amplitudes than shallow foundations. The analysis presented compares favourably with the static solution of Poulos.

Subject Headings: Pile foundations | Piles | Shear waves | Wave velocity | Damping | Cross sections | Torsion | Vibration

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