PSI - Issue 81

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Procedia Structural Integrity 81 (2026) 406–410

VIII International Conference “In - service Damage of Materials: Diagnostics and Prediction“ (DMDP 2025) Study of deflections of steel fiber concrete and steel fiber-reinforced concrete beams under low-cycle loading: an experimental study Serhii Drobyshynets a , Pavlo Sunak a , Ihor Mudryy b, *, Andriy Pelekh b , Vasyl Rizak c , Andrii

Subota c , Mykhailo Nesukh c , Bogdan Karavan d a Lutsk National Technical University, Lvivska 75, 43018 Lutsk, Ukraine b Lviv Polytechnic National University, S. Bandery 12, 79013, Lviv, Ukraine c Uzhhorod National University, 14 University Str., 88000 Uzhgorod, Ukraine d National University of Water and Environmental Engineering, Soborna 11, 33000 Rivne, Ukraine

© 2026 The Authors. Copy from the contract: Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2025 organizers Keywords: deflection, steel fiber concrete, steel fiber-reinforced concrete, beam, low-cycle loading, stress-strain state. 1. Introduction The efficiency of using timber, steel, and reinforced concrete structures (Babych et al. (2019); Kovalchuk et al. (2022); Andriichuk et al. (2018); Koteš et al. (2020); Iskhakov et al. (2023); Blikharskyy et al. (2021)) in construction is determin ed by their high strength and durability. These structural systems are widely applied in residential, industrial, and urban construction (Parneta et al. (2024); Ilnytskyy et al. (2019); Filipchuk et al. (2023); Bosak et al. (2021); Rybak et al. (2025); Babych et al. (2019)). Each of them has its own advantages and limitations (Chapiuk et al. (2025); Sobczak-Piastka et al. (2020); Dvorkin et al. (2021); Andriichuk et al. (2021)). One of the most commonly used structural materials is reinforced concrete (Drobyshynets et al. (2024); Kononchuk et al. (2022); Babich et al. (2019); Dovbenko et al. (2024); Andriichuk et al. (2019); Korniychuk et al. (2024)). Reinforced concrete structures represent a cost-effective and reliable solution in modern construction (Hadi et al. (2010); Filipchuk et al. (2024)). The combination of concrete and steel enables structures to withstand significant loads and environmental actions Abstract The article describes the methodology for manufacturing and testing the investigated beams. The results of experimental tests on the behavior of flexural elements under low-cycle loading are presented. Graphical relationships between stress levels and deflections of the specimens are provided. It was established that the type of reinforcement has a significant influence on beam deflections under low-cycle loading. Reinforced concrete and reinforced concrete with rebar and steel fibers beams exhibited a similar pattern of deflection development throughout the entire loading-unloading process, indicating effective composite action of the reinforcing bars and steel fibers within the concrete matrix. Stabilization of deflections occurred earlier in steel fiber reinforced concrete bending elements. The failure pattern of the beams confirmed that reaching the ultimate strains of the reinforcement is the governing criterion for loss of load-bearing capacity, while the presence of steel fibers promotes a more ductile failure process and increases the energy absorption capacity of the system.

* Corresponding author. Tel.: +38-096-202-09-07; fax: +0-000-000-0000 . E-mail address: qwert_2024@ukr.net

2452-3216 © 2026 The Authors. Copy from the contract: Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2025 organizers 10.1016/j.prostr.2026.03.070