Torsional Vibrations of Circular Foundations

by Gerd F. Weissmann, (M.ASCE), Supervisor; Mechanics of Materials Group, Bell Telephone Laboratories, Inc., Murray Hill, NJ,

Serial Information: Journal of the Soil Mechanics and Foundations Division, 1971, Vol. 97, Issue 9, Pg. 1293-1316

Document Type: Journal Paper


Vibrations of circular foundation about their axis of symmetry are investigated. The analytical solutions of forced torsional oscillations on an elastic homogeneous isotropic half space are modified in order to account for the internal friction of soils and slipping of the foundations. Experimental data obtained on silty clay and sand are used to verify the proposed mathematical model of forced torsional vibrations of rigid circular foundations. Simplified expressions are developed for the determination of the resonant frequency and the amplitude at resonance. Good agreement between the experimental data and the theoretically predicted values is obtained.

Subject Headings: Soil analysis | Clays | Torsion | Vibration | Foundations | Elastic analysis | Resonance | Symmetry

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