Heat and mass transfer in reinforced concrete columns under fire action with consideration of the cooling stage
https://doi.org/10.33979/2073-7416-2024-113-3-72-82
Abstract
Statistics on fire incidents in the Russian Federation indicate that a number of regions with high seismic activity have the highest number of fires in the country. This poses a risk of building collapses due to seismic loads on vertical load-bearing structures damaged by fire. The current normative approach to the calculation of fire safety of reinforced concrete structures does not consider heat and mass transfer at the stage following the termination of the fire. The distribution of temperature fields along the cross-section of a reinforced concrete column is analyzed, taking into account the stages of heating and cooling. Standard fire tests of experimental reinforced concrete specimens are performed. The duration of standard fire exposure is 15, 30 and 45 minutes. For the central areas of the cross[1]section, the highest temperatures were obtained after heating, with a temperature increase of up to 222%. To elucidate the distribution of temperature fields, a numerical heat-technical FE calculation of experimental specimens in SOLIDWORKS PC is conducted. Based on the experimental data on thermocouples, the thermal characteristics λ and C are specified for each sample. ts of the study indicate that in order to identify the maximum temperatures, it is necessary to consider both the heating and cooling stages.
About the Authors
A. G. Tamrazyan
Moscow State University of Civil Engineering
Russian Federation
Russian Federation
Tamrazyan Ashot G. - doctor in tech. sc., prof., head of the department of reinforced concrete and masonry structures
Moscow
V. I. Chernik
Moscow State University of Civil Engineering
Russian Federation
Russian Federation
Chernik Vladimir I. - lecturer of the department of reinforced concrete and stone structures, postgraduate student
Moscow
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Review
For citations:
Tamrazyan A.G., Chernik V.I. Heat and mass transfer in reinforced concrete columns under fire action with consideration of the cooling stage. Building and Reconstruction. 2024;(3):72-82. (In Russ.) https://doi.org/10.33979/2073-7416-2024-113-3-72-82
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