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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 Fundamentspetcremont The organization address: 420087, Russia, Kazan, Gvardeyskaya st., 56
Title of the articleEvaluation of the concrete endurance of the compressed zone of reinforced concrete bending elements under stationary cyclic loading conditions
Abstract.Problem statement. In reinforced concrete bending structures with repeated cyclic loads of stationary mode in the concrete of the compressed zone are manifested and inelastic creep deformations develop under connected conditions. For this reason, the conditions for deforming concrete in the compressed zone are non-stationary even when the external load is stationary. Results. Experimental and theoretical studies of the behavior of a reinforced concrete bending element have been carried out in the stationary mode of repeated cyclic loading, the mode of deformation of concrete in the compressed zone as part of the bending element is established. To assess the endurance of compressed zone concrete under such deformation modes, studies were conducted using methods of fracture mechanics of elastic-plastic materials and the equations of endurance of compressed zone concrete for non-stationary deformation mode were obtained. On the basis of the conducted research, the equation of endurance of compressed zone concrete was developed for practical calculations of reinforced concrete bending elements under stationary conditions of repeated cyclic loading. Conclusions. The significance of the results obtained for the construction industry is that the proposed method allows the most accurate assessment of the stress-strain state of concrete in the compressed zone and the processes of concrete change from the point of view of fracture mechanics, which is a significant contribution to the theory of fatigue strength and provides concrete savings of up to 25 % compared to existing methods.
Keywords.reinforced concrete, compressed zone concrete, endurance, cyclic loading, stationary loading, fracture mechanics, vibration creep, inelastic deformations.
For citations:Mirsayapov Ilizar T., Garifullin D.R. Evaluation of the concrete endurance of the compressed zone of reinforced concrete bending elements under stationary cyclic loading conditions // Izvestiya KGASU. 2020. №2(52) P.16-23.


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