About the authors

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 str., 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 str., 56 |

Title of the article | Engineering methods for calculating elastic modulus deformations and limits of concrete endurance under cyclic loading |

Abstract. | Problem statement. In reinforced concrete bent structures with repeated cyclic loads of stationary mode in the concrete of the compressed zone, the modulus of elasticity decreases and inelastic deformations of vibration creep develop. Due to the fact that creep deformations occur in connected conditions, the concrete deformations of the compressed zone are non-stationary even in the stationary mode of external load. Results. Theoretical studies of concrete behavior under stationary and non-stationary modes of repeated cyclic loading are carried out. To assess the change in the endurance limit and elastic modulus of concrete under such deformation modes, studies were conducted using the methods of fracture mechanics of elastic-plastic materials and engineering methods for calculating the endurance, deformations and elastic modulus of concrete for stationary and non-stationary deformation modes were obtained. Based on the conducted research, the equation of changes in the strength, modulus of elasticity and deformations of concrete was developed for practical calculations of reinforced concrete bending elements in stationary and non-stationary modes 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 35 % compared to existing methods. |

Keywords. | reinforced concrete, concrete, endurance, Young modulus, cyclic load, stationary loading, non-stationary loading, fracture mechanics, inelastic deformations of vibration creep. |

For citations: | Mirsayapov Ilizar T., Garifullin D.R. Engineering methods for calculating elastic modulus deformations and limits of concrete endurance under cyclic loading // Izvestiya KGASU. 2020. №3(53) P.15-26. |