METHOD OF DETERMINING THE FIRE PROTECTION CAPACITY OF A FIRE PROTECTION COATING FOR METAL STRUCTURES
Abstract
Computational experiments using computer simulation were carried out in the work. An identical sample of a steel plate coated with a fire retardant material that swells when exposed to the heat from a fire was reproduced. Developed and built thermal mathematical models of the specified sample with the conditions of influence of the standard fire temperature regime lasting 30 min., 45 min., 60 min.
The results of the practical experiment and the indicators obtained as a result of the calculations are analyzed. According to the results of computer experiments, it was established that under the action of the standard temperature mode of fire lasting 30 min., 45 min., 60 min. the error compared with experimental tests was 3.5% on average. Analyzing the obtained results, the largest error in the obtained indicators is observed during the fire during 30 minutes. and is 4.1%.
The operation of these models is based on the non-stationary differential equation of thermal conductivity with numerical approximation using the finite element method. According to the results of the numerical experiments, the temperature distribution on the surface of the steel plate from the side that is not heated under the influence of the standard temperature regime of the fire at different moments of time was determined.
Based on the results of numerical experiments, a method was developed to determine the effectiveness of the fire-resistant material that swells under the influence of fire for steel structures, which significantly simplifies such calculations and does not affect the accuracy of the obtained results.
