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English
This paper presents a large-scale experimental analysis of a new high-tech method for strengthening reinforced concrete columns using metal and CFRP materials. The research is justified by evaluating existing traditional and modern methods of strengthening reinforced concrete compressed elements, identifying their main drawbacks, and taking these into account, a new strengthening method was developed. To study the large-scale effect of the new high-tech metal and composite-based strengthening method, two groups of a total of 46 reinforced concrete column samples with different flexibilities were designed and tested for central and eccentric compression until failure. The main test parameters included column flexibility, load application eccentricity, internal and external metal reinforcement, spacing, and cross-sectional area of composite strengthening. The study investigated the influence of the above-mentioned variable factors on the failure pattern, ultimate strength, peak stress, and deformation characteristics of columns strengthened with carbon fiber composite materials (CFRP). The results showed that reinforced concrete columns strengthened with CFRP, having the same dimensions and tested under the same load application eccentricities, demonstrated different increases in ultimate strength compared to unstrengthened columns. Peak stress increased with an increase in the cross-sectional area of metal reinforcement and decreased with an increase in the distance between composite stirrups. Ultimate axial strains of strengthened samples increased with a decrease in the distance between composite stirrups. The difference in the cross-sectional area of composite strengthening did not have a significant impact on the load-bearing capacity and ultimate strains of reinforced concrete strengthened structures.
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18. Klyuev S.V., Slobodchikova N.A., Saidumov M.S., Abumuslimov A.S., Mezhidov D.A., Khezhev T.A. Application of ash and slag waste from coal combustion in the construction of the earth bed of roads. Construction Materials and Products. 2024. 7 (6). 3. https://doi.org/10.58224/2618-7183-2024-7-6-3
19. Pukharenko Yu.V., Khrenov G.M., Kluev S.V., Khezhev T.A. Eshanzada S.M. Design of steel fiber-reinforced concrete for slip forming. Construction Materials and Products. 2024. 7 (5). 2. https://doi.org/10.58224/2618-7183-2024-7-5-2
20. Kachurin N.M., Stas G.V., Prokhorov D.O., Gavrina O.A. Selection of technologies and directions for reducing the technogenic impact of mineral formations on the environment. Sustainable Development of Mountain Territories. 2024. 16 (1). P. 283–291. DOI:10.21177/1998-4502-2024-16-1-283-291.
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22. Georgiev S.V., Mailyan D.R, Solovyeva A.I. The high-tech and effective method of strengthening reinforced concrete structures with CFRP materials with preliminary modifi-cation of the cross-section shape. Construction Materials and Products. 2024. 6 (6). 2. DOI: 10.58224/2618-7183-2023-6-6-2
2. Xiao Y, Wu H. Compressive behavior of concrete confined by carbon fiber composite jackets. Journal of Materials in Civil Engineering, 2000. 12 (2). P. 144. DOI: 10. 1061/(ASCE)0899-1561(2000)12: 2(139)
3. Wu Gang, Lyu Zhitao Study on the stress-strain relationship of FRP-confined concrete circular column without a strain-softening response. Journal of Building Structures. 2003. 24 (5). P. 6. DOI: 10.3321/j.issn:1000-6869.2003.05.001
4. Wu Gang, Wu Zhishen, Lyu Zhitao Study on the stress-strain relationship of FRP-confined concrete circular column with a strain- softening response. China Civil Engineering Journal, 2006. 39 р.
5. Wu G., Wu Z., Lu Z. Stress-strain relationship for frp-confined concrete prisms. Fibre-Reinforced Polymer Reinforcement for Concrete Structures, 2003. P. 561 – 570.
6. Toutanji H, Deng Yong Strength and durability performance of concrete axially loaded members confined with AFRP composite sheets. Composites: Part B. 2002. 33 (4). P. 257. DOI: 10.1016/S1359-8368(02)00016–1
7. Youssef M N, Feng M Q, Mosallam A S. Stress-strain model for concrete confined by FRP composites. Composites: Part B. 2007. 38 (5/6). P. 623. DOI: 10.1016/j.compositesb. 2006. 07. 020
8. Gu Xianglin, LI Yupeng, Zhang Weiping Compressive stress-strain relationship of concrete confined by carbon fiber composite sheets. Structural Engineers. 2006. 22 (2). P. 54. DOI: 10.3969/j.issn.1005-0159.2006.02.012
9. Teng J G, Huang Y L, Lam L. Theoretical model for fiber reinforced polymer confined concrete [J]. Journal of Composites for Construction, ASCE. 2007. 11 (2). P. 208. DOI: 10.1061/(ASCE)1090-0268(2007)11:2(201)
10. Klyuyev S.V., Klyuyev A.V., Lesovik R.V., Netrebenko A.V. High strength fiber concrete for industrial and civil engineering. World Applied Sciences Journal. 2013. 24(10). P. 1280 – 1285.
11. Abramyan S.G., Klyuev S.V., Polyakov V.G., Sabitova T.A., Akopyan G.O., Guseynov K.M. Specifics of information model development for functional conversion of offshore oil platforms. Construction Materials and Products. 2023. 6 (4.) P. 42 – 57. https://doi.org/10.58224/2618-7183-2023-6-4-42-57
12. Кlyuev S.V., Klyuev A.V., Аyubov N.А., Fediuk R.S., Levkina Е.V. Finite Element Design and Analysis of Sustainable Mono-Reinforced and Hybrid-Reinforced Fibergeopolymers. Advanced Engineering Research (Rostov-on-Don). 2025. 25(3). P. 171-185. https://doi.org/10.23947/2687-1653-2025-25-3-171-185
13. Wu Gang, Lyu Zhitao. Study on the stress-strain relationship of FRP-confined concrete rectangular columns. Journal of Building Structures. 2004. 25 (3). P. 104. DOI: 10.3321/j.issn:1000-6869.2004.03.016
14. Jing Denghu, Cao Shuangyin A model for calculating the axial stress strain curve of square-section concrete column confined by FRP]. China Civil Engineering Journal. 2005. 38 (12). P. 35. DOI: 10.3321/j.issn:1000-131X.2005.12.006
15. Pan Jinglong, Wang Yuguang, Lai Wenhui Effect of sectional shape of concrete column on the bearing capacity of short columns wrapped with FRP. Industrial Construction, 2001. 31 (6). 18. DOI: 10.3321/j.issn:1000-8993.2001.06.005
16. Kuznetsov D.V., Klyuev S.V., Ryazanov A.N., Sinitsin D.A., Pudovkin A.N., Kobeleva E.V., Nedoseko I.V. Dry mixes on gypsum and mixed bases in the construction of low-rise residential buildings using 3D printing technology. Construction Materials and Products. 2023. 6 (6). 5. DOI: 10.58224/2618-7183-2023-6-6-5
17. Abramyan S.G., Klyuev S.V., Emelyanova O.E., Oganesyan O.V., Chereshnev L.I., Akopyan G.O., Petrosian R.O. Improving reinforced concrete column strengthening techniques for reconstruction projects using composite jacketing formworks. Construction Materials and Products. 2023. 6 (5). 1. https://doi.org/10.58224/2618-7183-2023-6-5-1
18. Klyuev S.V., Slobodchikova N.A., Saidumov M.S., Abumuslimov A.S., Mezhidov D.A., Khezhev T.A. Application of ash and slag waste from coal combustion in the construction of the earth bed of roads. Construction Materials and Products. 2024. 7 (6). 3. https://doi.org/10.58224/2618-7183-2024-7-6-3
19. Pukharenko Yu.V., Khrenov G.M., Kluev S.V., Khezhev T.A. Eshanzada S.M. Design of steel fiber-reinforced concrete for slip forming. Construction Materials and Products. 2024. 7 (5). 2. https://doi.org/10.58224/2618-7183-2024-7-5-2
20. Kachurin N.M., Stas G.V., Prokhorov D.O., Gavrina O.A. Selection of technologies and directions for reducing the technogenic impact of mineral formations on the environment. Sustainable Development of Mountain Territories. 2024. 16 (1). P. 283–291. DOI:10.21177/1998-4502-2024-16-1-283-291.
21. Kulikova E.Yu., Balovtsev S.V., Skopintseva O.V. Geoecological monitoring during mining operations. Sustainable Development of Mountain Territories. 2024. 16 (2). P. 580–588. https://doi.org/10.21177/1998-4502-2024-16-2-580-588.
22. Georgiev S.V., Mailyan D.R, Solovyeva A.I. The high-tech and effective method of strengthening reinforced concrete structures with CFRP materials with preliminary modifi-cation of the cross-section shape. Construction Materials and Products. 2024. 6 (6). 2. DOI: 10.58224/2618-7183-2023-6-6-2
Georgiev S.V., Mailyan D.R., Solovyeva A.I., Che XiangYu, Kiiamova L.I. Experimental analysis of a new high-tech method of strengthen-ing reinforced concrete structures based on the use of metal and CFRP materials. Construction Materials and Products. 2025. 8 (6). 9. https://doi.org/10.58224/2618-7183-2025-8-6-9