Dmytrenko Y. The calculation model of bond in reinforced concrete at the presence of discrete cracks

Object - resistance of reinforced concrete structures of industrial and civil buildings in the interaction of reinforcement with concrete; research objective - to develop an analytical model of bond reinforcement with concrete in nonlinear formulation by the presence of discrete cracks during deformation effects taking into account the descending branch of the deformation; methods - experimental and theoretical; in theoretical and numerical studies - general methods of solid deformed body mechanics, the theory of reinforced concrete and software systems, including PC "LIRA SAPR"; novelty - for the first time proposed analytical model of bond reinforcement with concrete in nonlinear formulation with developing system of closed nonlinear equations, two of which are first-order differential equations; the technique was improved and for the first time experimental studies of bond reinforcement with concrete during deformation effects taking into account the descending branch of the deformation in concrete under the central and noncentral tension of reinforcing rods, pulling reinforcing rods from concrete, indentation of reinforcing rods in the concrete and shear along discrete cracks were conducted; the results of the comparative analysis of experimental, analytical and numerical studies with different ways of modeling of bond reinforcement with concrete using PC "LIRA-SAPR"; results - proposed analytical model of bond reinforcement with concrete in reinforced concrete structures in the presence of discrete cracks and taking into account the parameters and characteristics of concrete and reinforcement deformation provides a more reliable solution and identify the reserves for the rational use of materials; branch - building