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First name, Middle name, Last name, Scientific degree, Scientific rank, Current position. Full and brief name of the organization, The organization address.Mirsayapov Ilizar Talgatovich doctor of technical sciences, professor E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Kazan State University of Architecture and Engineering The organization address: 420043, Russia, Kazan, Zelenaya St., 1 Garifullin Dinar Rafikovich chief engineer E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it NPPF Fundamentspetsremont The organization address: 420087, Russia, Kazan, Gvardeyskaya st., 56
Title of the articleStress-strain state of normal sections of reinforced concrete elements under cyclic inelastic deformation of reinforcement
Abstract.Problem statement. The purpose of the study is to identify the features of the stress-strain state of reinforced concrete structures under low-cycle loading with inelastic deformation of the longitudinal working reinforcement Results. Based on the results of the study, the development of inelastic deformations in the longitudinal stretched reinforcement makes significant changes in the stress-strain state of the normal cross-section of the bent reinforced concrete element under low-cycle loading in comparison with the case of elastic deformation of the reinforcement. At the same time, there is an uneven development of reinforcement deformations due to the presence of cracks in the concrete of the stretched zone, as well as secondary cracks that begin at the source of normal cracks and develop in the directions parallel or slightly inclined to the compressed face of the elements. Analytical studies of the influence of higher-specified factors on the stress-strain state of normal sections of a reinforced concrete element in the zone of compressed bending are performed. Based on the research results, the equations of the mechanical state of concrete of the compressed zone and the stretched longitudinal zone of the reinforcement under inelastic deformation of the reinforcement are developed. Conclusions. The significance of the results for theories of reinforced concrete and the construction industry includes the fact that established on the basis of theoretical studies the stress-strain state of normal sections in the zone of pure bending under cyclic loading allows more accurate assessment of the mechanical concrete of the compression zone and the longitudinal main reinforcement in terms of cyclic inelastic deformation of the reinforcement, which is a significant contribution to the theory of fatigue strength to ensure a saving of concrete and steel reinforcement up to 20 % compared to the same calculation methods.
Keywords.low-cycle endurance, reinforced concrete, reinforcement, inelastic deformations yield strength, normal sections, cracks, normal stresses, compressed zone concrete, cycle asymmetry coefficient.
For citations:Mirsayapov Ilizar T., Garifullin D.R. Stress-strain state of normal sections of reinforced concrete elements under cyclic inelastic deformation of reinforcement // Izvestiya KGASU. 2020. №4(54) P.44-53.


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