THE PHYSICALLY NONLINEAR CONTACT ANALYSIS OF CIRCULAR PLATE ON DEFORMABLE FOUNDATION BY ANSYS SOFTWARE

A circular reinforced concrete plate on deformable foundation is investigated in this paper. A foundation is composed of three layers of soil which are defined as isotropically nonlinear materials with variable physical properties. The reinforced plate is treated as an elastic body. Dissymmetrical half-circular loading of linearly variable pressure is subjected on the plate. Generally the unified system "structure-foundation" is the contact analysis problem, which is modeled by ANSYS software. The plastic shear deformations are evaluated in solving of contact problem by the finite element method. Comparable analysis with treatment of physically linear system "structure-foundation" is performed. After linear analysis the comparison shows, that rigidity of the foundation generates bigger extreme stresses in the plate in context of the Huber-Mises criterion. However in nonlinear analysis, intensity of stresses is naturally decreasing when more flexible model of the foundation is used.