Revealing patterns in the behavior of a reinforced concrete slab in fire based on determining its stressed and deformed state
DOI:
https://doi.org/10.15587/1729-4061.2023.289930Keywords:
reinforced concrete ribbed slabs, fire resistance, iterative Newton-Raphson method, finite element methodAbstract
The object of research is the fire resistance of reinforced concrete ribbed slabs. The subject of research is the effect of the level of mechanical load on the fire resistance of the studied reinforced concrete ribbed slab under the influence of fire. Currently, the assessment of the fire resistance of such structures using the tabular method is significantly limited by certain geometric parameters of these plates. It is also not considered possible to apply the zone method, since reinforced concrete ribbed slabs consist of components that receive thermal effects according to various scenarios and geometric parameters, which is not taken into account in Eurocode 2.
Experimental calculations carried out in the current work using a refined procedure involving the finite element method allow solving the actual scientific and technical problem related to the determination of the dependence of the fire resistance of these structures on the level of load applied.
The calculation of the temperature spread over a reinforced concrete ribbed slab under the influence of the standard temperature regime of fire was carried out using convection and radiant heat exchange, which is recommended by Eurocode 2. The iterative implicit Newton-Raphson method was used to solve the mechanical problem. Evaluation of fire resistance of reinforced concrete ribbed slabs was carried out according to the onset of signs of the limit state of fire resistance due to the loss of load-bearing capacity. According to the results, it was established that at 100 % load level of the structure under investigation, the critical deflection of more than 268 mm and the rate of growth of deformation exceeding 18 mm/min were recorded simultaneously on minute 43.9.
According to the results of the research, the regularity of the limit of fire resistance of reinforced concrete ribbed slabs from the level of the applied mechanical load was established. This will make it possible to design and build buildings and structures using the specified building structures with guaranteed fire resistance classes, which improves the level of safety for people at the facilities
References
- Vasilchenko, A., Danilin, O., Lutsenko, T., Ruban, A. (2021). Features of evaluation of fire resistance of reinforced concrete ribbed slab under combined effect "explosion-fire". Materials Science Forum, 492–499. doi: https://doi.org/10.4028/www.scientific.net/msf.1038.492
- Yao, Y., Zhang, H., Fei Zhu, Y., Liu, Y. (2023). Progressive collapse resistance of reinforced concrete beam-column connection under fire conditions. Structures, 47, 1265–1283. doi: https://doi.org/10.1016/j.istruc.2022.11.147
- Pozdieiev, S., Nuianzin, O., Sidnei, S., Shchipets, S. (2017). Computational study of bearing walls fire resistance tests efficiency using different combustion furnaces configurations. MATEC Web of Conferences, 116, 02027. doi: https://doi.org/10.1051/matecconf/201711602027
- Nekora, O., Slovynsky, V., Pozdieiev, S. (2017). The research of bearing capacity of reinforced concrete beam with use combined experimental-computational method. MATEC Web of Conferences, 116, 02024. doi: https://doi.org/10.1051/matecconf/201711602024
- Concrete Reinforcing Steel Institute - CRSI (2015). Fire Resistance of Reinforced Concrete Buildings. CRSI Technical Note ETN-B-1-16. Schaumburg, Illinois, 6.
- Shnal, T., Pozdieiev, S., Nuianzin, O., Sidnei, S. (2020). Improvement of the Assessment Method for Fire Resistance of Steel Structures in the Temperature Regime of Fire under Realistic Conditions. Materials Science Forum, 1006, 107–116. doi: https://doi.org/10.4028/www.scientific.net/msf.1006.107
- Vassart, O., Zhao, B., Cajot, L. G., Robert, F., Meyer, U., Frangi, A. (2014). Eurocodes: Background & Applications Structural Fire Design. European Union, 256. doi: https://doi.org/10.2788/85432
- Nekora, V., Sidnei, S., Shnal, T., Nekora, O., Dankevych, I., Pozdieiev, S. (2021). Determination of features of composite steel and concrete slab behavior under fire condition. Eastern-European Journal of Enterprise Technologies, 6 (7 (114)), 59–67. doi: https://doi.org/10.15587/1729-4061.2021.246805
- BS EN 1992-1-1:2004+A1:2014. Eurocode 2: Design of concrete structures General rules and rules for buildings. Available at: https://www.en-standard.eu/bs-en-1992-1-1-2004-a1-2014-eurocode-2-design-of-concrete-structures-general-rules-and-rules-for-buildings/
- Mosley, B., Bungey, J., Hulse, R. (2012). Reinforced concrete design to Eurocode 2. Palgrave Macmillan. Available at: https://www.academia.edu/43123370/Reinforced_concrete_design_to_Eurocode_2
- Zafarullah, N., Ameir, E., Nakayama, A., Muhammad Bilal, H. S. (2022). Determination of structural reliability of a reinforced concrete slab under fire Load. E3S Web of Conferences, 347, 01009. doi: https://doi.org/10.1051/e3sconf/202234701009
- Lim, L., Buchanan, A., Moss, P., Franssen, J.-M. (2004). Numerical modelling of two-way reinforced concrete slabs in fire. Engineering Structures, 26 (8), 1081–1091. doi: https://doi.org/10.1016/j.engstruct.2004.03.009
- Fire safety of construction. General requirements. DBN V.1.1-7-2016. Kyiv: Ministerstvo rehionalnoho rozvytku ta budivnytstva, 35. Available at: https://zakon.isu.net.ua/sites/default/files/normdocs/28a25142ab16479b848fd157e102a044.pdf
- BS EN 1363-1:2020. Fire resistance tests - General requirements.
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Copyright (c) 2023 Stanislav Sidnei, Andriy Berezovskyi, Serhii Kasiarum, Olha Lytvynenko, Ihor Chastokolenko
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