Translation. Region: Russian Federation –
Source: Saint Petersburg State University of Architecture and Civil Engineering –
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Scholarship recipients of the Faculty of Civil Engineering at the Russian Government Scholarship Awards Ceremony: Oleg Yatskovets, Ekaterina Buryak, and Zlata Zolotykh. Dean Andrei Nikulin is on the right.
Oleg Yatskovets, a sixth-year student in the Department of Reinforced Concrete and Masonry Structures at SPbGASU, is conducting research on "Statistical Patterns of the Kinetics of Resistance of Bending Reinforced Concrete Elements under Low-Temperature Conditions." The research was supported by a 2025 grant from SPbGASU. Oleg's supervisor is Vladimir Popov, Associate Professor of the Department and Candidate of Engineering Sciences.
"Alternating freezing and thawing of concrete affects not only its strength but also its deformation properties. Current standards don't adequately address the variability of concrete's deformation properties, despite the fact that nonlinear deformation model calculations use both the strength and deformation properties of concrete. Moreover, when exposed to alternate freezing and thawing cycles, these properties are significantly degraded," Oleg noted.
The study, conducted using methods of mathematical statistics and diagrammatic calculation, allowed us to draw the following key conclusions:
The type of concrete deformation diagram has little effect on the statistical distribution of the bearing capacity of bending reinforced concrete elements under conditions of alternating temperatures; with a low percentage of reinforcement (up to and including 1%), the effect of alternate freezing cycles (EFC) has no practical effect; with a high percentage of reinforcement, taking into account the conditions of alternating temperatures leads to a significant decrease in the bearing capacity compared to the standards; in the absence of EFC for any percentage of reinforcement and under the effect of EFC for a low percentage of reinforcement (up to 1.5%), the provision is not lower than the required values. Under the effect of EFC for a high percentage of reinforcement, the provision becomes lower than required; taking into account the variability of the deformation characteristics of concrete at low percentages of reinforcement (up to 1%) under conditions of alternating temperatures has virtually no effect on the value of the bearing capacity, and at high percentages of reinforcement it leads to a decrease in the values of the bearing capacity; The provision of the maximum reinforcement coefficient μR and the parameters associated with it (ξR, ω) before the central heating is already insufficient according to regulatory documents, and after exposure to alternating temperatures it decreases to almost zero for various classes of reinforcement, which significantly increases the risk of brittle fracture and the occurrence of emergency situations.
The obtained results confirm the need for further study of the variability of the deformation characteristics of concrete and its influence on the performance of bending reinforced concrete elements under conditions of alternating freezing and thawing.
Based on the research results, two articles were published in journals included in the Higher Attestation Commission (HAC) list. Furthermore, a state registration certificate was obtained for the SIGA 61 computer program, which enables calculations of the load-bearing capacity of flexural reinforced concrete, steel fiber reinforced concrete, and composite flexural elements in normal sections using the diagrammatic method, using various types of material stress-strain diagrams.
Publication in journals listed by the Higher Attestation Commission (HAC) confirms the scientific significance of the work. The articles also received the highest expert praise, winning two first-place laureate diplomas at the 48th International Competition of the All-Russian Society of Scientific Researchers.
For outstanding achievements in his academic and research work, Oleg Yatskovets was awarded a Russian Government scholarship. Furthermore, his research was awarded a third-place diploma at the IV International Competition of Scientific, Methodological, and Creative Works "Knowledge. Innovation. Priorities."
Other current recipients of presidential and government scholarships among SPbGASU students include Ivan Beshentsev (fourth-year student in the Faculty of Automobile and Road Construction, recipient of the President of Russia scholarship); Anna Andreeva and Denis Astapov (both fourth-year students in the Faculty of Forensic Expertise and Law in Construction and Transport); Evgeny Anufriev (fifth-year student in the Faculty of Automobile and Road Construction); Ekaterina Buryak (fourth-year student in the Faculty of Civil Engineering); and Zlata Zolotykh (first-year student in the Master's program at the Faculty of Social Sciences) – recipients of the Government of the Russian Federation scholarships.
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