Predicting the Geometric Shape of the Cross-Section of Fire Retardant Wooden Beams under Conditions of Fire

Abstract

The article presents the results of the depth of charring of wooden beams with fire- retardant cladding with OSB plates and fire-retardant plywood during fire tests under standard temperature conditions. The aim of the work was to identify changes in the geometric parameters of the charring zone of a wooden beam as a basis for calculating the design data for the strength of these beams. To achieve the aim, the following tasks were set: to determine that the contours of the charred zone in the cross-sections of wooden beams with fire-retardant cladding can be described using isotherms with a critical temperature of charring initiation; to develop a method for mathematically describing the geometric shape of the charring zone in the cross-section of the beam by approximating the contour lines of this zone using Bézier lines.