METHOD FOR DETERMINING THE FIRE RESISTANCE OF REINFORCED CONCRETE COMPRESSED ELEMENT OF THE ANNULAR SECTION Russian patent published in 2019 - IPC G01N25/50 

FIELD: fire safety.

SUBSTANCE: invention relates to the field of fire safety of buildings. It can be used to classify reinforced concrete compressed elements of annular cross section according to their resistance to fire. Method for determining the fire resistance of compressed reinforced concrete element of the building structure is claimed, according to which a test of a reinforced concrete compressed element of an annular section is carried out without destroying a set of single quality indicators by means of evaluating their value using statistical control. To do this, the geometrical dimensions of the concrete element, the degree of reinforcement of concrete and the conditions of fastening the element are determined; density, humidity and index of thermal diffusion of concrete; the intensity of the voltage of the annular cross section of the element, the reliability indicator of the reinforced concrete element by purpose (level of responsibility), the index of the continuity of the housing of the reinforced concrete element of the annular section and its flexibility. Description of the process of resistance of a reinforced concrete element to a fire influence is represented by a mathematical dependence that takes into account the dimensions of the cross section of the element, the reinforcement degree α_μs, the intensity of the power voltage J_σ0, the normative resistance of concrete to axial compression R_bn and indicator of thermal diffusion of concrete, D_ct, as well as the value of the integral indicator of safety of a reinforced concrete element of the annular section. Fire resistance of a reinforced concrete element is determined using an analytical expression.

EFFECT: ensuring the determination of the fire resistance of a reinforced concrete element of the annular section without full-scale fire impact, increased reliability of statistical quality control.

8 cl, 2 dwg