IMPROVEMENT OF THE CALCULATION ASSESSMENT OF THE LIMIT OF FIRE RESISTANCE OF A LOAD-BEARING REINFORCED CONCRETE WALL BASED ON THE RESULTS OF FIRE EXPERIMENTS

Abstract

The purpose of this work is to develop an improved methodology for estimating the fire resistance limit of a load-bearing reinforced concrete wall based on temperature measurements at control points, according to a fire test conducted in a small-sized installation without mechanical load and taking it into account during calculations.

In this work, an algorithm for calculating the fire resistance limit of a load-bearing reinforced concrete wall based on the obtained experimental data based on the results of fire tests without mechanical load has been developed, which is the basis of the general methodology. The method of interpretation of data on the heating temperature of a load-bearing reinforced concrete wall, whose fragments were heated in a small-sized fire furnace according to the standard temperature regime of a fire without load, was improved; accordingly, the obtained data can be part of the experimental and calculation method of estimating the fire resistance limit. Due to the development of a more rational scheme for the locations of temperature control sensors (thermocouples), which are sufficient for data interpolation.

Temperature distributions in cross-sections of load-bearing reinforced concrete walls were determined. It was established that by changing the length of the product and the distributed load, which is designed during the operation of the structure in the building, it is possible to determine the fire resistance limit for load-bearing reinforced concrete walls of other dimensions and with a different working load.