PSI - Issue 81

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ScienceDirect

Procedia Structural Integrity 81 (2026) 401–405

© 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 frame, stressed-deformed state, artificial adjustment of forces, repeated loads, concrete, reinforcement. 1. Introduction In modern construction practice, various types of cast-in-place reinforced concrete frames are widely used in the design and construction of buildings and structures for general purposes. These structural systems provide reliability and long-term durability, even under severe climatic conditions. At the same time, existing calculation methods for statically indeterminate reinforced concrete structures do not fully account for changes in the physical and mechanical properties of materials during service, the development of cracking, (Chapiuk et al. (2023); Dvork і n et al (2021); Babich et al. (2019); Filipchuk et al. (2023)) deformation processes , and the evolution of the stress – strain state of frame elements . In addition, the features of internal force redistribution occurring under the influence of repeated loading are insufficiently considered (Dvork і n et al (2017); Babych et al (2018); Sobczak-Piastka et al (2020)). Thus, the relevance of using reinforced concrete frames with ties is determined by their high technical and economic performance , architectural versatility , and compliance with current design codes. Further improvement of calculation methods and construction technologies for such systems will contribute to increased construction efficiency and the development of innovative Abstract The paper presents the results of an experimental study on the behavior of double-hinged reinforced concrete frames with artificial force regulation subjected to single and repeated low-cycle loading. Low-cycle loading has a significant influence on the stress – strain state of U-shaped reinforced concrete frames with artificial force regulation. Under such loading, total and residual deformations of concrete and reinforcement, deflections, and crack widths in frame elements increase. It was found that total deformations in both concrete and reinforcement stabilize by the sixth loading cycle. The bearing capacity of a double-hinged reinforced concrete frame with artificial force regulation exceeds that of a similar frame without force regulation by 5.3% under single loading and by 20.3% under repeated loading. In addition, the deflection of the frame crossbar is reduced by 16.1% under single loading and by 11.2% under repeated loading compared to frames without artificial force regulation. VIII International Conference “In - service Damage of Materials: Diagnostics and Prediction“ (DMDP 2025) Stress – strain state of double-hinged reinforced concrete frames with artificial force regulation under repeated low-cycle loading Serhii Filipchuk*, Victor Karavan, Oleksandr Sobishchanskyi , Yuri Kovalchuk National University of Water and Environmental Engineering, Soborna 11, 33000 Rivne, Ukraine

* Corresponding author. Tel.: +380682260008. E-mail address: s.v.filipchuk@nuwm.edu.ua

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.2026.03.069