Seismic Analysis for Building Structures Under Dynamic Soil-Pile Interaction Using Simplified Models

Abstract

This paper presents the application of a new simplified model to simulate dynamic soil-pile interaction undergoing coupled sliding and rocking motions. The developed model's components and parameters are calculated using the theory of equivalent models developed in the previous work. A parametric analysis has been carried out for structural responses using dimensionless parameters considering dynamic soil-pile-structure interaction (SPSI). The analyzed parameters include earthquake frequencies, pile tip conditions, story mass ratios, and story stiffness ratios. The results show that the simplified model accurately estimates the peak response of the SPSI system at low frequencies. The magnification factors analyzed by the simplified model also agree well with the analytical solutions at high frequencies when the pile tip is fixed. Besides, the simplified model slightly overestimates the dynamic responses at high frequencies for the SPSI system when the pile tip is considered simply supported. Hence, the simplified model proposed has a good potential to be applied to the seismic analysis for building structures considering dynamic SPSI.