Strengthening Technology for Damaged Floor Slabs through Compression Zone Enlargement and External Reinforcement

Authors

  • Oleg Kalmykov O.M. Beketov National University of Urban Economy in Kharkiv image/svg+xml
  • Nina Psurtsieva O.M. Beketov National University of Urban Economy in Kharkiv image/svg+xml
  • Kostiantyn Binkevych O.M. Beketov National University of Urban Economy in Kharkiv image/svg+xml

DOI:

https://doi.org/10.26906/znp.2025.65.4181

Keywords:

floor slab strengthening, reinforced concrete overlay, external reinforcement, chemical anchors, load-bearing capacity, building rehabilitation

Abstract

The article presents a technology for strengthening reinforced concrete floor slabs by enlarging the compressed zone and using external reinforcement. A 50 mm-thick monolithic overlay is installed on top of the slab, while steel channels are anchored below using chemical fasteners. The slab is pre-leveled with jacks; after hardening, the beams are removed. Full-scale hydrostatic tests confirmed the restored load-bearing capacity and minimal deflections (~2 mm). The method eliminates the need for dismantling, accelerates reconstruction, reduces costs by up to 58%, and preserves interior geometry - making it highly suitable for restoring war-damaged residential buildings.

References

1. Kalmykov, O.O., Binkevych, K.O., & Pasha, Ye.O. (2025). Features of calculating floor slabs strengthened by increasing the compressed zone. Construction and Civil Engineering, 1, 193–202. https://doi.org/10.33042/2522-1809-2025-1-189-193-202

2. Skoruk, O.M. (2023). Strengthening of hollow-core slabs with steel beams and fiber-reinforced concrete. Building Structures. Theory and Practice, 12, 115–125. https://doi.org/10.32347/2522-4182.12.2023.115-125

3. Rudnieva, I., Priadko, Yu., Priadko, M., & Tonkacheiev, H. (2020). Features and prospects of strengthening building structures with composite materials during reconstruction. Building Structures. Theory and Practice, 7, 12–22. https://doi.org/10.32347/2522-4182.7.2020.12-22

4. Smoliar, A.M., Miroshkina, I.V., & Yurchenko, S.V. (2016). Strengthening slab elements using structural bending. Modern Technologies and Calculation Methods in Construction, 5, 284–291.

1. Kramarchuk, A., Ilnytskyy, B., & Lytvyniak, O. (2023). Restoration of load-bearing structures in a multi-storey residential building after a fire caused by military operations. Budownictwo i Architektura, 23, 43–53. https://doi.org/10.35784/bud-arch.6210

2. Baggio, D., Soudki, K., & Noël, M. (2014). Strengthening of shear critical RC beams with various FRP systems. Construction and Building Materials, 66, 634–644. https://doi.org/10.1016/j.conbuildmat.2014.05.097

3. Vytak, O., & Bobalo, T. (2025). Strengthening of reinforced concrete slabs by adding monolithic beams: methods and implementation. JTBP. 2025; Volume 7, Number 2, 34-44 https://doi.org/10.23939/jtbp2025.02.034

4. Yang, S.-H., Cao, S.-Y., & Gu, R.-N. (2015). New technique for strengthening reinforced concrete beams with composite bonding steel plates. Steel and Composite Structures, 19(3), 735–757. https://doi.org/10.12989/scs.2015.19.3.735

5. Faur, A., & Virág, J. (2019). Implications upon using exterior post-tensioning tendons to retrofit a low strength concrete waffle slab. MATEC Web of Conferences, 289, 04002. https://doi.org/10.1051/matecconf/201928904002

6. Hani, A., & Munir, M. (2020). Structural behavior of RC slabs strengthened by embedded concrete beams. Journal of Engineering and Sustainable Development, 24(6), 46–55.

7. 160 buildings are planned to be restored in Kharkiv. (2025). Official website of the Kharkiv City Council. URL: https://www.city.kharkiv.ua/uk/news/u-kharkovi-planuetsya-vidnoviti-160-budinkiv-57062.html

8. Economic and Social Development Program of Kharkiv Region for 2025. (2024). Kharkiv Regional Council. URL: https://oblrada-kharkiv.gov.ua/wp-content/uploads/2024/12/programa-chastyna-1-zi-zminamy-1.pdf

9. Otrosh, Yu.A. (2018). Assessment of the technical condition of walls and slabs of residential buildings after fire. Industrial Construction and Engineering Structures, 9, 17–23.

14. Kalmykov, O.O., Binkevych, K.O. (2024). Experimental determination of deformability of floor panels in a large-panel residential building after strengthening. Scientific Bulletin of Construction, 110, 42–52. https://doi.org/10.33042/2522-1809-2025-1-189-193-202

Downloads

Published

2025-12-26

Issue

Vol. 2 No. 65 (2025): ACADEMIC JOURNAL Industrial Machine Building, Civil Engineering

Section

"Construction and civil engineering"

License

Copyright (c) 2025 Oleg Kalmykov, Nina Psurtsieva, Kostiantyn Binkevych

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Most read articles by the same author(s)