PSI - Issue 81

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ScienceDirect

Procedia Structural Integrity 81 (2026) 411–416

VIII International Conference “In - service Damage of Materials: Diagnostics and Prediction“ (DMDP 2025) Research on the behavior of reinforced concrete T-shaped flexural members subjected to low-cycle loading Petro Gomon a , Volodymyr Dovbenko a , Svyatoslav Gomon a , Olha Savytska a , Sviatoslav Homon a ,

Bogdan Karavan a , Ruslan V. Pasichnyk b , Ihor Mudryy c, * a National University of Water and Environmental Engineering, Soborna 11, 33000 Rivne, Ukraine

b Lutsk National Technical University, Lvivska 75, 43018 Lutsk, Ukraine c Lviv Polytechnic National University, S. Bandery 12, 79013, Lviv, 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: reinforced concrete, beam, low-cycle loading, load-bearing capacity, stress-strain state, crack, deformability. 1. Introduction The accelerating pace of economic development demands higher efficiency of capital investments and resource-saving approaches in construction (Sobczak-Piastka et al., 2020; Bosak et al., 2021; Chapiuk et al., 2025; Kononchuk et al., 2022; Babych et al., 2019; Hud et al. 2024), including the rational use of primary materials (Babich et al., 2019; Rybak et al., 2025; Pidgurskyi et al., 2024). The reduction of construction costs requires the improvement of analytical and design methods for structural elements of buildings and facilities, particularly those made of reinforced concrete, which remains the primary material in contemporary construction (Rybak et al., 2024; Dovbenko et al., 2024; Kovalchuk et al., 2022; Korniychuk et al., 2024; Filipchuk et al., 2024; Dvorkin et al., 2021). Reinforced concrete structures are widely used in both precast and cast-in-place forms (Babych et al., 2017; Parneta et al., 2024; Chapiuk et al., 2023; Kovalchuk et al., 2022; Filipchuk et al., 2023; Andriichuk et al., 2020). A significant proportion of load bearing members are flexural T-shaped reinforced concrete elements, such as ribbed slabs, crane girders, floor beams, and beams of special structures. Many of these elements are subjected to low-cycle loading, with loading levels varying depending on operating Abstract The article investigates the behavior of reinforced concrete T-beams under low-cycle loading. It was established that repeated loading can increase the load-bearing capacity of elements (in this case up to 7%), but it is accompanied byincreased deflections and crack widths. Stabilization of concrete strains in the extreme fibers was observed at the 6th – 7th loading cycle. The influence of cross-sectional geometry was revealed: with an increase in flange thickness, beam deflections, crack widths, and concrete strains decreased, while the ultimate capacity increased. At the same time, excessive enlargement of the flange thickness negatively affected the strengthening capacity of the elements after low-cycle loading. The obtained results may be applied to improve calculation methods and to enhance the reliability of reinforced concrete structures, particularly those operating under repeated or seismic loading conditions.

* 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.2026.03.071