METHOD FOR DETERMINING THE RATE OF CHARRING OF A WOODEN COMPRESSED ELEMENT Russian patent published in 2019 - IPC G01N25/50 G01N33/46 

FIELD: fire safety.

SUBSTANCE: invention relates to fire safety: to investigation of combustion parameters of solid substances, construction materials and wooden structures, in particular to determination of rate of charring of wooden compressed elements in fire conditions in a building. According to the invention, a wooden compressed element is tested without flame exposure by nondestructive methods on a set of unit quality factors of a wooden compressed element. For this purpose position of wooden compressed element in building space is determined, geometrical sizes of wooden element, conditions for burning of dangerous cross-section of wooden element in fire conditions, critical layer of charring, average density, strength and moisture of wood in natural condition. Required value of the rate of charring of the section of a wooden compressed element is determined from analytical equation (1). Description of burning process of compressed element in fire conditions for assessment of charring section rate is represented by mathematical dependence, which takes into account position of heated faces of wooden compressed element in building space, massiveness of section, actual moisture content, average density and strength of wood for compression.

EFFECT: possibility of determining the rate of charring of a wooden compressed element without fire tests, high reliability of quality control of construction timber, wooden compressed structural elements and nondestructive tests, low economic costs for testing.

3 cl, 2 dwg