STRESS-STRAIN STATE OF A CIRCULAR CYLINDRICAL COFFERDAM UNDER THE INFLUENCE OF HYDROSTATIC PRESSURE

Abstract

In this work, based on a three-dimensional system of differential equilibrium equations in partial derivatives of the linear theory of elasticity of an anisotropic body, are established parameters that describe the stress-strained state of a circular cylindrical cofferdam located in the field of hydrostatic pressure. To reduce a three-dimensional system to a one-dimensional one, the Bubnov-Galerkin method was used, which approximated unknown systems of equations along the generatrix and took into account that the shell is deformed taking into account axial symmetry in the circular direction. To solve the resulting one-dimensional problem in the direction of the normal to the middle surface of the shell, the discrete orthogonalization method was used.

The effect of strengthening the structure with a composite unidirectional fibrous material, the main elastic directions of which can be at an angle to the generatrix of the cylinder, is analyzed. The values of the stress and displacement components are compared for a single-layer steel structure and a two-layer steel and fiber composite structure.