Факультет цифрових, освітніх та соціальних технологій
Постійне посилання на фондhttps://repository.lntu.edu.ua/handle/123456789/50
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Item type:Наукова стаття, Deformability of a glued wooden beam with pre-stressed composite reinforcement(2024) Gomon, Petro; Babych, Yevgenij; Polishchuk, Mykola; Kysliuk, Dmytro Y.; Bandura, Irina; Pakholiuk, Orest; Shevchuk, AnastasiiaThe article proposes a method for pre-stressing a reinforced glued wooden beam that involves placing steel reinforcement in the form of metal rods in the compressed zone and pre-stressed composite reinforcement in the form of tape in the tension zone. The procedure for pre-stressing is outlined, and experimental studies of such bending elements have been carried out. Graphs of the distribution of deformations in both wood and reinforcement along the height of the calculated cross-section during pre-stressing and without pre-stressing are provided. It was found that the load-bearing capacity of the reinforced glued wooden beam increased by 45% during the pre-stressing process with composite reinforcement in the tension zone.Item type:Наукова стаття, Adhesion of Class A500C Steel Reinforcement to Concrete of Various Strengths(2026) Chapiuk, Oleksandr; Filipchuk, Sergiy; Suvorov, Oleksandr; Pakholiuk, Orest; Kusliuk, Dmytro; Zadorozhnikova, Iryna; Uzhegova, Olga; Shevchuk, AnastasiiaNew experimental data on the bond forces (bond stresses) between sickle-shaped ribbed steel reinforcement of class A500C and normal-weight concrete of various strength classes have been obtained. Pull-out tests of 16 mm diameter steel bars embedded in concrete prisms 5d (80 mm) high were conducted using a hydraulic tensile testing machine. An improved calculation methodology is proposed to ensure a reliable bond between A500C steel reinforcement and normal-weight concrete of varying strength levels. It was established that an increase in concrete strength leads to a proportional increase in the bond capacity of sickle-shaped reinforcement. A linear relationship between the maximum tangential bond stresses and concrete strength was identified, demonstrating good agreement with the experimental results. The proposed linear dependence can be applied in the design of reinforced concrete structures for calculating the ultimate bond strength between sickle-shaped steel reinforcement and normal-weight concrete of various strength classes.