Abstract
The purpose of the study is to identify in the process of exploitation of reinforced concrete structures, buildings that experience various types of cyclic loads, while the behaviour of these structures under low-cycle loading, especially when the working extended reinforcement is deformed beyond the elastic limit, is poorly studied. Based on the results of the study, the development of inelastic deformations in the longitudinal extended reinforcement makes significant changes in the stress-strain state of normal sections of the bent reinforced concrete element under low-cycle loading in comparison with the case 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 extended zone, as well as secondary cracks that begin at the source of normal cracks and develop in directions parallel or slightly inclined to the compressed edge 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 results study, the equations of the mechanical state concrete of the compressed zone and the extended longitudinal zone of the reinforcement under inelastic deformation of the reinforcement are developed. The results obtained are that the stress-strain state of normal sections in the zone of pure bending under cyclic loading, established on the basis of theoretical studies, allows us to assess most accurately the mechanical properties of the compressed zone and the longitudinal working reinforcement in the conditions of inelastic cyclic deformation of the reinforcement, which is a significant contribution to the theory of fatigue strength to provide savings of concrete and steel reinforcement up to 20% compared to similar calculation methods.
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Mirsayapov, I. (2021). Influence of Inelastic Deformations of Reinforcement on the Stress-Strain State of Reinforced Concrete Bending Elements Under Cyclic Loading. In: Vatin, N. (eds) Proceedings of STCCE 2021. STCCE 2021. Lecture Notes in Civil Engineering, vol 169. Springer, Cham. https://doi.org/10.1007/978-3-030-80103-8_20
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