PSI - Issue 72

Oleksandr Chapiuk et al. / Procedia Structural Integrity 72 (2025) 308–314

313

σ s , МPа

140

1

2

100

60

0 20

δ , mm

0,00

0,05

0,10

0,15

0,20

Fig. 5. Variation of rod slip δ based on the stress σ s in prisms P-4: 1 represents the first cycle, and 2 represents the eleventh cycle (within the intervals of the third, fifth, and seventh cycles).

The performance of samples P-5 and P was similar. In samples P-5, the residual slip was nearly identical to that of samples P-4, while in samples P-6, it was reduced by half. In specimens P-5, the ultimate state occurred at reinforcement stresses of σ s 0 m = 248.8 MPa, whereas in specimens P-6, the ultimate state was reached at reinforcement stresses of σ s 0 m = 398.0 MPa. This indicates that repeated loading did not influence the reinforcement stresses in the ultimate state when compared to a single load. 4. Conclusions 1. The limit state of adhesion of sickle-shaped reinforcement to concrete is defined as the condition when the displacement of the free end of the rods relative to the concrete reaches 0.2 mm. 2. Experimental evidence shows that when reinforcement is employed in a section with its full design resistance, the minimum length for rod anchoring in relation to this section should be at least 15 times the diameter of the rod (15 d ). 3. The stresses in the rods at the limit state of adhesion are linearly dependent on the anchoring length. 4. Repeated service-level loads cause residual slippage of the rods but do not influence the stress values in the reinforcement at the ultimate state compared to a single load. References Abendroth, M., Soltysiak, S., 2016. Assessment of material properties by means of the small punch test. Recent Trends in Fracture and Damage Mechanics, 127-157 Aleksiievets, V., Gomon, S., Aleksiievets, I., Homon, S., Ivaniuk, A., Zadorozhnikova, I., Bandura, I., 2024. Influence of thicknesses of outer and middle elements on the performance of nail connections. Procedia Structural Integrity 59, 710-717 Babych, Y.M.,Savitskiy, V.V.,Andriichuk, O.V.,Ninichuk, M.V.,Kysliuk, D.Y., 2019. Results of experimental research of deformability and crack-resistance of two span continuous reinforced concrete beams with combined reinforcement. IOP Conference Series: Materials Science and Engineering 708(1), 012043 Bosak, A., Matushkin, D., Dubovyk, V., Homon, S., Kulakovskyi, L., 2021. Determination of the concepts of building a solar power forecasting model. Scientific Horizons 24(10), 9-16 Chapiuk, O., Oreshkin, D., Hryshkova, A., Pakholiuk, O., Avramenko, Y., 2023. Adhesion of the Metal and Composite Fiberglass Rebar with the Heavyweight Concrete. Lecture Notes in Civil Engineering 299, 47-60 Datsiuk, V., Homon, S., Gomon, S., Dovbenko, V., Petrenko, O., Parfentyeva, I., Romaniuk, M., 2024. Effect of long-term operation on the strength properties of pine wood. Procedia Structural Integrity 59, 583-587. DBN B.1.2-14-2018, 2018. Zahalni pryntsypy zabezpechennia nadiinosti ta konstruktyvnoi bezpeky budivel i sporud [General principles of ensuring the reliability and structural safety of buildings and structures]. Ministry of Regional Development of Ukraine, Kyiv, pp. 30. Dovbenko, V., Kukhniuk, O., Homon, S., Ivaniuk, A., Aleksiievets, V., Savytska, O., Kulakovskyi, L., 2024. Study of the strength properties of concrete impregnated with a polymer composition. Procedia Structural Integrity 59, 702-709 DSTU 3760:2019, 2019. Prokat armaturnyy dlya zalizobetonnykh konstruktsiy. Zahalʹni tekhnichni umovy [Reinforcing bars for reinforced concrete structures. General technical conditions]. Ministry of Regional Development of Ukraine, Kyiv, 18