METHOD FOR DETERMINING FIRE RESISTANCE OF REINFORCED CONCRETE COLUMN OF ROUND SECTION Russian patent published in 2019 - IPC G01N3/60 G01N25/50 

FIELD: fire safety.

SUBSTANCE: invention relates to the field of fire safety of buildings. Carry out technical inspections, establish the type of concrete and reinforcement of a concrete element, identifying the conditions of its support and fastening, determining the time of occurrence of the limit state on the basis of the loss of the carrying capacity of the reinforced concrete element under test load under conditions of standard heat exposure, conducting non-failure evaluation tests on a set of individual indicators of the quality of a reinforced concrete element, in which a technical inspection is accompanied by instrumental measurements of the geometric dimensions of the reinforced concrete element and its dangerous sections, the areas of concrete and reinforcement are established in the dangerous section. Indicators of thermal diffusion of concrete, stiffness and critical force of a reinforced concrete column, humidity and density of concrete are determined. Limit resistances of concrete and reinforcement for compression, the degree of reinforcement of the dangerous section of the reinforced concrete element and the magnitude of the intensity of the power stresses in the dangerous section are found. As a reinforced concrete element take reinforced concrete column of circular cross section and additionally determine the reliability of reinforced concrete circular column of the purpose, reveal the continuity of her body in a dangerous section, the actual limit of fire resistance from the beginning of the standard fire impact to the loss of carrying capacity (F_ur, min), which is determined using the analytical equation.

EFFECT: ability to determine the fire resistance of a reinforced concrete column of circular cross section without full-scale fire impact, increasing the reliability of statistical quality control and non-destructive tests, reducing economic costs.

7 cl, 3 dwg