Kinematic Pile Response to Vertical P-wave Seismic Excitation |
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Authors: | George Mylonakis George Gazetas |
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Affiliation: | 1Associate Professor, City University of New York, New York, NY?10031. 2Professor, National Technical University, Athens, Greece.
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Abstract: | An analytical solution based on a rod-on-dynamic-Winkler-foundation model is developed for the response of piles in a soil layer subjected to vertical seismic excitation consisting of harmonic compressional waves. Closed-form solutions are derived for: (1) the motion of the pile head; (2) the peak normal strain in the pile, and (3) the group effect between neighboring piles. The solutions are expressed in terms of a dimensionless kinematic response factor Iv, relating pile-head motion and free-field soil surface motion, a dimensionless strain transmissibility factor Iε, relating pile and soil peak normal strains, and a pile-to-pile interaction factor α measuring group effects. It is shown that a pile foundation may significantly reduce the vertical seismic excitation transmitted to the base of a structure. |
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Keywords: | Kinematics Excitation Piles Pile foundations |
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