All the positive qualities of reinforced concrete as a building material are ensured mainly by the joint work of reinforcement and concrete. The forces ensuring the retention of reinforcement inside the concrete were called adhesion forces. We can say that adhesion is a combination of physical and mechanical phenomena along the contact surface of reinforcement and concrete, providing their connection and resisting the movement of reinforcement relative to concrete. To describe the real phenomena occurring in the embedment of reinforcement, the actual stress-strain state in concrete and reinforcement, a new calculation model is proposed that describes the actual mechanism of operation and failure of the embedment and methods for calculating stresses in concrete and reinforcement and displacements in the reinforcement. For this, as well as to develop methods for calculating the movement of reinforcing bars and the bearing capacity of the seal, a calculation model is proposed based on the splitting model of Professor A.S. Zalesov. To calculate the movement of reinforcement, a transformed three-line diagram of the deformation of concrete with a descending branch is proposed. Based on the developed calculation model and calculation methods, theoretical dependences are obtained for determining the displacements of the reinforcement of the bar in the seal and the bearing capacity of the reinforcement anchoring. Theoretical results are in good agreement with the experimental data of various authors.
In the article, the authors present the results of a study of a flat reinforced concrete beamless floor of an existing building. The experiment consisted of loading a slab in span with water tanks. There were 15 loading stages in total, on average 4 kN. During the experiment, data was obtained on the relative deformations of concrete and reinforcement in the span and on the support. Also, observations of the growth of vertical deformations and the growth of cracks in the span were introduced.
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