RESEARCH OF TEMPERATURE DISTRIBUTIONS IN THE CROSS-SECTIONS OF WOODEN BEAMS WITH FIREPROOF FACING

Abstract

The article presents the results calculation of temperature distributions inside the cross-section of a wooden beam with fireproof facing. The subject of research is the influence of structural parameters of wooden beams on fire resistance under conditions of thermal action of high temperatures during a fire. The purpose is to reveal the regularities of heating the sections of wooden beams with fireproof facing with OSB plates, as changes in the geometric parameters of their carbonization zone under the conditions of the standard fire temperature regime to estimate their fire resistance limit. To fulfill this goal, the following research tasks: on the basis of the conducted fire tests, develop a method of interpolation of temperature distributions inside samples-fragments of a wooden beam; to develop a method of mathematical description of the geometric shape of the carbonization zone in the cross-section of a wooden beam without fire protection and with fireproof facing based on OSB plates. To develop a methodology for calculating temperature distributions inside the cross-section of a wooden beam with fireproof facing and tabular, thermo physical methods and mathematical modeling were used to construct contour lines of the charring zone. The scientific novelty of the study consists in revealing the regularities that establish the dependence of the configuration of the charring zone of wooden beams on the structural parameters their fireproof facing. the influence of the standard fire temperature regime, as a scientific basis for improving the calculated assessment of their fire resistance. After the calculations, the main result was obtained which allow you to determine the geometric configuration of the non-carbonized part of the cross section of the beam and determine its bearing capacity using the real geometric characteristics of the non-charred section of the wooden beam.