This paper investigates the characteristics of dynamic soil springs in 31 high-rise reinforced concrete (RC) buildings with pile foundation and proposes simple evaluation equations. Using an axisymmetric finite element method (FEM), the dynamic soil springs at the bottom and lateral sides were analytically separated, and the effects of various parameters on their stiffness were examined. Based on the analysis, simple evaluation equations are proposed to estimate the stiffness of embedded pile foundation soil springs using a limited number of parameters. The proposed method demonstrates an error margin of approximately ±20%, indicating its validity and practical applicability.
