COMPOSITE SYSTEMS OF EXTERNAL REINFORCEMENT OF REINFORCED CONCRETE STRUCTURES

Abstract

The article discusses the design solutions of systems of external reinforcement of reinforced concrete structures with composite materials. Schemes of deformation and collapse of structures under static bending are studied. The obtained dependences and laws of joint work of concrete and non-metallic reinforcement are generalized. The results of experimental studies of reinforced concrete structures by several authors are presented, a comparison is made that shows the similarity of the results of empirical methods in the approaches of various scientists. It is shown that the operation of a composite structure with external reinforcement is significantly influenced by the presence of a stress-strain state and force damage at the moment of amplification, as well as their level relative to critical values. The hypothesis of a change in the typical nature of the destruction of structures, namely, due to the loss of strength for the perception of tangential stresses of the contact zones of concrete and external reinforcement, is confirmed. It is shown that the work of concrete in the compressed zone determines the load-bearing capacity to a lesser extent in reinforced structures than in non-reinforced ones. A new method of assessing the load-bearing capacity is proposed by introducing the concept of limiting relative deformations of the adhesive seam in the contact zone. The dependence between the strength of the contact zone and the strength of the reinforced concrete structure is obtained.