Nonlinear Soil Spring Model Applied to Simplified Pushover Analysis of Soil-Pile Interaction

AriMochammad Teguh


An approximate solution to the earthquake problem occurring in the seismic performance of pile-to-pile cap connections has been performed by applying a statically or cyclically lateral load to the superstructure, which is assumed to reflect the effect of the earthquake. In this case, the develop-ment of soil spring values based on the p-y method was adopted to approximate such a solution of soil spring stiffness and modeling in a two-dimensional static incremental (pushover) analysis. The soil was modeled using nonlinear pile elements and the applied loads were simulated as a combination of vertical distributed and lateral loads acting on the pile cap. The nonlinear soil springs associated with the p-y and t-z springs were utilized along the circular reinforced concrete pile. The pile was embedded in two different soil layers, which were varied with depth. A numerical application of the simplified model for soil-pile interaction based on this method was carried out with the more complex finite element analysis, demon-strating a significant lateral displacement reduction due to the soil confinement surrounding the pile.

Keywords: nonlinear, soil spring, soil-pile interaction, finite element, pushover analysis, earthquake

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