Dynamic Response of Pile-Supported Frame Foundations

by Fakhry Aboul-Ella, Asst. Prof.; Coll. of Architecture, King Faisal Univ., Dammam, Saudi Arabia; formerly, of The Univ. of Western Ontario, London, Ontario, Canada,
Milos Novak, (M.ASCE), Prof.; Faculty of Engrg. Science, The Univ. of Western Ontario, London, Ontario, Canada,

Serial Information: Journal of the Engineering Mechanics Division, 1980, Vol. 106, Issue 6, Pg. 1215-1232

Document Type: Journal Paper


A theoretical approach is analyzed of the dynamic response of pile-supported frame foundations of turbomachineries to rotor unbalances. The approach includes dynamic interaction of soil, piles, flexible foundation mat, three-dimensional structural frame, flexible rotor, and viscoelastic oil film in journal bearings. The approach employs substructuring, dynamic stiffness method, and finite elements. Shear deformations and material damping are included in the stiffness matrices of the finite elements that are complex and frequency dependent. The stiffness matrix of the element is generalized to incorporate the stiffness and damping of the supporting medium including piles. It was found that soil-structure interaction markedly affects the response of the frame as well as the rotors in the lowest resonant regions. In the vicinity of a high operating speed, soil-structure interaction can be neglected.

Subject Headings: Stiffening | Soil-structure interaction | Finite element method | Dynamic response | Piles | Frames | Soil-pile interaction | Shear deformation

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