Seismic py Responses of Flexible Piles

by Takaaki Kagawa, (A.M.ASCE), Sr. Geotechnical Engrg.; Special Projects Group, McClelland Engrgs., Inc., Houston, Tex.,
Leland M. Kraft, Jr., (M.ASCE), Manager; Special Projects Group, McClelland Engrgs., Inc., Houston, Tex.,

Serial Information: Journal of the Geotechnical Engineering Division, 1980, Vol. 106, Issue 8, Pg. 899-918

Document Type: Journal Paper

Abstract: The finite element method was designed to solve soil-pile-structure interaction under seismic excitation by introducing solid beam elements to reproduce beam flexure and soil-pile interaction. Dynamic lateral load-deflection relationships were characterized by ratio of soil reaction per unit pile length to product of pile displacement relative to free-field motion and dynamic stress-strain properties of soil. Three heterogeneous soil profiles with equivalent linear approximation of nonlinear stress-strain behavior were used with this new finite element method to study the characteristics of dynamic lateral load-deflection relationships. Results were compared with those by other investigators and showed that the proposed method provided improved means of evaluating load-deflection relationships of piles. Results of this study were used to compute discrete soil-pile springs and dashpots for use in a beam-on-Winkler foundation model.

Subject Headings: Soil-pile interaction | Dynamic loads | Finite element method | Displacement (mechanics) | Piles | Soil stress |

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