Calculation of the Fire Resistance Limit of a Steel-Reinforced Concrete Slab Based on Experimental Data on Heating in a Small-Size Fire Furnace

Abstract

The article considers the issue of calculating the fire resistance limit of a steel-reinforced concrete slab with a corrugated profile based on experimental data of its heating in a small-sized fire furnace. The need to combine the results of experimental studies with calculation methods to increase the accuracy of determining the load-bearing capacity of structures under fire conditions is substantiated.An experimental-calculation approach is proposed, which involves the use of point temperature measurements in the control zones of the slab cross-section with subsequent interpolation of the temperature field and determination of the stress-strain state taking into account the temperature dependence of the physical and mechanical characteristics of materials. The calculation was performed in accordance with the requirements of current regulatory documents on the design of steel-reinforced concrete structures for fire resistance.An example of the application of the methodology for assessing the loss of bearing capacity of a slab under standard fire exposure and operational load conditions is given. A comparative analysis of the obtained results with experimental test data was carried out, which confirmed the adequacy and practical suitability of the proposed approach.The developed methodology allows for a substantiated determination of the fire resistance limit of steel-reinforced concrete slabs without conducting full-scale tests and can be used in the design and assessment of fire safety of building structures for various purposes.