GENERAL MODEL OF ADHESION REINFORCEMENT OF CONCRETE

Abstract

The basic provisions of the generalized adhesion model of reinforcement with concrete have been developed, which remains valid for any deformation stage of reinforced concrete elements. It differs from others in relative simplicity in that it is aimed at meeting the basic requirements of design engineers. This model is based on the function of the universal parameter - the efforts of adhesion the reinforcing rod with concrete along its conditional cylindrical surface. It is proposed to determine these efforts by means of a nonlinear function of the average adhesion stresses of reinforcement with concrete in the areas between the cracks. It is substantiated why the limit values of adhesion forces in the area between normal cracks remain unchanged and equal to the limit force in the stretched concrete. The most important parameters for tracing the adhesion level of reinforcement with concrete at any deformation stage of reinforced concrete element are determined. The violation of the reinforcement with concrete interaction is suggested to be fixed with the help of the strength extreme criterion of the stretched concrete.

The classification and the critical analysis of existing models of reinforcement with concrete adhesion mathematical solutions of their contact interaction schemes are given. The processes of formation and development of normal cracks in reinforced concrete elements are proposed to regulate the determining parameters of reinforcement with concrete adhesion.

The basis of the performed researches is the mathematical modeling of parameters of reinforcing bar with concrete adhesion along its conditional cylindrical surface.