Reinforced concrete is one of the most common materials in construction. Constructions made of this material have a high bearing capacity; well perceived dynamic and static loads. This is ensured by the adhesion between the reinforcing bar and concrete. The amount of adhesion is made from a number of different factors formed in the region of the conventional surface of interaction of reinforcement with concrete. It is implied that even if any reinforcement is used, materials come into contact over the surface, which can collapse depending on the load. Violation of the clutch causes significant deformation of the structure, which subsequently leads to a loss of the bearing capacity of the element. Therefore, there is a need to study the magnitude of the adhesion between concrete and reinforcement under various influences. This article describes the results of a numerical experiment on pulling out fiberglass reinforcement of a periodic profile from concrete. A mathematical model is constructed, which allows to study the accumulation of defects and the destruction of reinforcement in the area of concrete fixing. The results of numerical studies are considered.

Prefabricated reinforced concrete structures are widely used to speed up the erection of structures in construction practice; they are connected during installation by means of embedded core elements, subsequently monolithic with concrete. Under the influence of external loads, axial tensile and transverse shear forces arise in such nodal joints, which are often neglected in the static analysis of structures. In turn, this can lead to the development of ultimate deformations in the assembly, to a change in the conditions for fixing the structure, and, as a consequence, to their premature collapse. This article discusses the effect of the axial pulling force in the reinforcing bar on the stress-strain condition (VAT) of the concrete mass surrounding it. To solve this problem, a numerical experiment is carried out in the ANSYS 19.0 Workbench package, in which the adhesion of fiberglass and metal reinforcement to concrete is simulated. It allows establishing the nature of the stress distribution in the core embedment area.