The article discusses the features of modeling composite reinforced concrete beams from various (B25 and B65) concrete strength classes. The basic principles of the theory of composite rods were applied in the modeling process. The section of the reinforced concrete beam was divided by boundary layers with a reduced shear coefficient. The stresses and the nature of the distribution of deformations over the height of the beam section were evaluated before and after the introduction of a different number of boundary layers. During the extended analysis, options for introducing vertically arranged boundary layers along the length of the beam were considered. Based on the results obtained, it was possible to evaluate the specifics of the operation of bent structures with a different number of boundary layers.

Keywords: contact zone, contact characteristic, shear modulus, shear calculation, composite structure, reinforced concrete beam made of high-strength concrete

The article deals with the peculiarities of the results of tests carried out to determine the characteristics of the contact zone organized by stamping on a steel plate. During the test, the specimen was in the steel mold in which it was manufactured. The steel form was used to prohibit horizontal movement of the steel thin plates and minimize the effect of uneven slippage of the steel gouge in the direction perpendicular to the shear force. The considered tests were carried out according to a specially developed methodology, which took into account the specifics of the contact zone shear operation, the applied tooling and took into account the set objectives of the study.

Keywords: contact zone, contact characteristics, test methodology, shear tests, stamping, composite design