ЮЖНЫЙ — Строительные материалы — ЮЖНЫЙ — Строительные материалы

The problem of the soil-structure interaction (SSI) is crucial for the accurate prediction of the behaviour of structures subjected to seismic or other dynamic loads. The analysis of SSI effects requires the solution of the coupled problem of the structure and the ground, which is computationally expensive, particularly when dealing with complex geometries and nonlinear behaviour of the soil or the structure. Therefore, various methods have been proposed to simplify the SSI analysis, including the use of equivalent linear or nonlinear springs at the interface, the application of simplified models for the soil behaviour, or the use of approximate methods, such as the response surface method (RSM), the finite element method (FEM), or the boundary element method (BEM).

One of the simplest and most widely used methods for SSI analysis is the Winkler model, which assumes that the soil behaves as a collection of independent springs with constant stiffness distributed over the foundation area. The Winkler model is a linear approximation, and it does not account for the nonlinear behaviour of the soil or the interaction between the soil particles. However, it is computationally efficient and can provide reasonable results for simple cases, such as shallow foundations on homogeneous soil.

Another popular method for SSI analysis is the Poggesi model, which is a nonlinear extension of the Winkler model. The Poggesi model assumes that the soil behaves as a collection of independent nonlinear springs with varying stiffness distributed over the foundation area. The nonlinearity is introduced through a pressure-dependent stiffness, which accounts for the change in soil stiffness with increasing pressure. The Poggesi model can provide better accuracy than the Winkler model, particularly for deep foundations or nonlinear soil behaviour.

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