THE SUBSTANTIATION OF THE MATHEMATICAL MODEL OF THE PROCESS OF CHARRING OF THE SAMPLE FRAGMENTS OF WOODEN BEAMS WITH FIREPROOF REVETMENT

Abstract

The glued wooden structures and details are often used in construction. They have the looking beams with a rectangular and a tee section, a stinger, an element truss and arches. But this materials have an increased flammability and they can spread flames very quickly with lots of smoke. Due to the flammability of these structures it is important to guarantee their normalized fire resistance, as part of the comprehensive fire safety of construction objects. The use of fire protection lining remains an effective means of achieving the designed fire resistance of wooden frames. Fire resistant OSB panels are a promising material for fire protection. For fire retardant wooden beams, that is widespread in construction, we use fire protection lining remains based on OSB (Oriented Strand Board). The fire resistance of these plates was investigated using the experimental method. The research was conducted in an experimental furnace under the action of high temperatures and the influence of the standard temperature regime of the fire for 15, 30 and 60 minutes. The scientific novelty is to use methods such us: experimental, tabular and calculation method. This will allow to create mathematical models for predicting the geometry of the charcoal zone of wooden beams laminated with OSB panels. The subject of the scientific is the impact of change the geometry of the charcoal zone of wooden beams, this affects the accuracy of the mathematical model of the charcoal process. The constructed mathematical models can be considered as a scientific basis for the creation of new engineering calculation methods for estimating the fire resistance of wooden beams with flame retardant lining of OSB panels. Such engineering and design methods allow to improve the normative basis for the design of fire resistant wooden structures.