INFLUENCE OF CHLORIDE CORROSION ON THE STRESS-STRAIN STATE OF THE REINFORCED CONCRETE PLATE ON AN ELASTIC BASE

Abstract

The operating conditions of a number of reinforced concrete structures used in agricultural production cause the need of taking into account the chloride corrosion to analyze their long-term operation strength. Under the influence of chloride corrosion, the destruction of concrete and corrosion of metal reinforcement appear and lead to a change in the stress-strain state of the reinforced structures and to their durability reduction. In the presented work, the mathematical model of the elastically based reinforced concrete plate under the influence of chloride corrosion is presented as a fourth-order nonlinear differential equation in partial derivatives. The effect of concrete degradation on the stress-strain state of the structure was implemented by a technique involving a method of successive parameter perturbations to solve the nonlinear part of the problem and the grid method for solving the boundary part of the problem. There was developed a program that allows to analyze the behavior of the reinforced plate under the action of chloride corrosion on one or both surfaces of the plate. The algorithm of the program allows to change the boundary conditions, reinforcement parameters, direction, concentration and chlorides’ penetration velocity. There was analyzed the change in the stress-strain state of the reinforced plate over time for one of the possible variants of chloride corrosion pattern. On the basis of the computational results’ analysis it was demonstrated how the durability curve changes due to the action of chloride corrosion.