Deformation-strength model application at the determining of stress-strain state of reinforced concrete structures

The work considers the possibility and expediency of deformation-strength model applica-tion in the study of stress-strain state of reinforced concrete structures. Relying on the basic provisions of the mechanics of solid deformable body and the real stages of work of reinforced concrete elements, it is generalized and established by the authors that the real state of rein-forced concrete structures cannot only be described by stresses diagrams or only by strain diagram. Aim of the paper is consideration of concrete and reinforced concrete elements’ work as a force and deformation model. The theory of reinforced concrete structures resistance, as before, is aimed at a precise definition of the four major problems: accurate calculation of the load at which the first cracks appear; deter-mination of the width of the cracks in the operational phase, starting from the moment of their appearance; calculation of rigidity and deflec-tions, including the maximum permissible; definition of maximum possible bearing capacity (strength or stability). The real state of the rein-forced concrete structure cannot be displayed only by stress distribution or deformations diagrams. This can only be done when used in con-junction with both diagrams. In this case, the generalized model of the element deformation should be able to equally reflect both the nature of the growth of relative deformation of materials, and a process of continuous redistribution of stresses in them, especially at the stages that are close to the limit equilibrium.