Numerical Analysis of the Interaction between Shallow (Square, Circular and Strip) Foundations and Subsoil

Abstract

Abstract:In this paper, the effects of the stiffness of circular, square and strip foundation structures and bonding effects were analyzed. Presented analysis was oriented on the influence of stiffness system "foundation-subsoil" and bonds (bi-directional bond and one-directional bond with and without friction). The results of numerical calculations have proved that the relative stiffness of system "foundation-subsoil" affect considerably the value and the distribution of contact stresses (vertical normal and shear stresses) in the foundation gap and value of the displacements (settlement, deflection and relative deformations) of foundation. From the numerical point of view, this problem was solved by deformation variant of the FEM (finite element method). The numerically obtained results were presented in the graphical and tabular forms. Obtained results were qualitative and quantitative compared with one another. From the calculation results it is obvious that relative stiffness of the system "foundation structure-subsoil" substantially affects distribution of contact stresses in the foundation subsoil and displacements (settlement, deflection and relative deformations, flexibility) of foundation. In the case of flexible foundations, the bond on the contact surfaces must be considered during the calculation. On the other hand, the effects of friction on the contact surface between the foundation and subsoil affect the distribution of contact stresses and deformations only to smaller extent.

Comparison of Analytical and FEM Solutions of the Contact Tasks of Foundation - Subsoil Interaction

“…[2,3,4,5,6,7], -approximate solutions (numerical, empirical and experimental methods), e.g. [1,8,9,10,11,12,13,14], -combined solutions (based on a combination of semi-empiric, numerical and experimental methods), e.g. [15,16].…”

“…Choosing the most appropriate methods is mainly determined by the nature and complexity of the problem, as well as by the need to ensure the required safety and reliability of structures. Solving of the foundation-subsoil interaction by using Finite Element Method (FEM) was also presented in [1,8,9].…”

Foundation Plate Optimization

“…When we analyse any top building it is necessary to consider also a contact with the foundation. An analysis of such structures is presented by quite a lot of authors, in particular, we mention Bharatha [1], Hrustinec [2], Jendzelovsky [3], Tomlinson [4], and others. A foundation is unlimited, however, regarding a certain area in contact with the structure of a finite part.…”