68th Canadian Geotechnical Conference and 7th Canadian Permafrost Conference

EVALUATION OF SEISMIC KINEMATIC AND INERTIAL FORCES IN PILES

Session: Foundations III / Fondations III

Mahmoud Hussien, Université de Sherbrooke, Sherbrooke (Canada)
Mourad Karray, Université de Sherbrooke, Sherbrooke (Canada)
Tetsuo Tobita, Kyoto University (Japan)
Susumu Iai, Kyoto University (Japan)

Parametric analyses are carried out by means of nonlinear two-dimensional (2D) finite element (FE) analyses, focusing on normalized seismic forces in piles supporting structures as affected by typical characteristics of structures and piles. The results of the study provide a new interpretation of the interplay between pile kinematic and inertial seismic forces. It is found that for relatively short/stiff piles; the kinematic interaction can be the prime contributor to the seismic forces in the pile provided that the excitation frequency is not close to the natural frequency of the coupled soil-pile-structure system, fSSI. The results show also that maximum kinematic seismic force does not always occur at the fundamental frequency of the deposit. For certain relative soil-pile stiffness and excitation amplitudes, the largest peak of the kinematic seismic forces in piles can be occurring at the second mode.