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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 Email: 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 str., 1 Garifullin Dinar Rafikovich chief engineer Email: 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 str., 56
Title of the articleEndurance evaluation of normal sections of reinforced concrete bending elements by the method of limit stresses
Abstract.Problem statement. The aim of the work is to undertake theoretical studies of the fatigue strength of normal sections of reinforced concrete bending elements under stationary and non-stationary modes of cyclic loading, taking into account the continuous change in the state and endurance limits of materials. For the development of calculation methods, at present, in this formulation, research results are not enough. Results. The authors carried out theoretical studies of changes in the stress-strain state of normal sections of reinforced concrete bending elements under stationary and non-stationary modes of repeated cyclic loading. The research showed that, regardless of the loading mode, there is a change in the stresses and stress cycle asymmetry coefficients in the concrete of the compressed zone and the longitudinal stretched reinforcement. Based on the results of the performed studies, we developed a method for evaluating the endurance of normal cross-sections of reinforced concrete bending elements and analytical equations to describe the changes in stresses and stress cycle asymmetry coefficients in the concrete of the compressed zone and stretched reinforcement of normal cross-section. Conclusions. The significance of the result for the construction industry lies in the fact that the developed method allows for an adequate and accurate assessment of the stress-strain state and endurance of normal sections, which is a significant contribution to the theory of design of structures under the action of cyclic loads. It also provides economy of concrete and rebar up to 15 % compared to existing calculation methods.
Keywords.reinforced concrete bending element, normal cross-section, compressed zone concrete, maximum stresses, cyclic loading stress cycle asymmetry coefficient, non-stationary and stationary loading.
For citations:Mirsayapov Ilizar T., Garifullin D. R Endurance evaluation of normal sections of reinforced concrete bending elements by the method of limit stresses // Izvestija KGASU. 2021. № 1 (55). Р. 13–23. DOI: 10.52409/20731523_2021_1_13.


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