METHOD FOR DETECTING THE RESISTANCE TO THE STRETCHING OF THE REINFORCED CONCRETE ELEMENT IN A FIRE CONDITION Russian patent published in 2018 - IPC G01N25/50 

FIELD: fire safety.

SUBSTANCE: invention relates to the fire safety of buildings, in particular the fire resistance of reinforced concrete elements of building structures, and concerns the investigation and analysis of the quality of stretched reinforcement by means of thermal means when the load is exposed to a joint and the high temperature of a standard fire. Method for detecting the resistance to stretching of the reinforced concrete element in a fire condition includes conducting a full-scale inspection of a reinforced concrete element, measuring its geometric dimensions, identification of the reinforcement scheme, the determination of the type of concrete and its thermal characteristics, the size of the protective layer of concrete and the depth of occurrence of the stretched reinforcement, the determination of the type and class of the reinforcement by strength, its standard resistance and the value of the critical heating temperature, the coefficient of change in the standard resistance of heated reinforcement to tension. In this case, the test of the reinforced concrete element is carried out without destruction according to the set of single indicators of the quality of concrete and reinforcement, and the value of the limiting standard tensile strength of the reinforcement according to the fire resistance is determined according to the maximum standard resistance to the reinforcement extension according to the fire resistance of the reinforced concrete element, equal to the product of the standard tensile strength of the reinforcement and the reliability factor for the reinforcement.

EFFECT: technical result is expressed in increasing the accuracy and expressiveness of determining the degree of fire protection of the armature, the degree of its heating for a given duration of a standard fire, in increasing the speed, in determining the parameters that affect the behavior of stretched reinforcement under conditions of high temperature, in reducing the required amount of computer memory for calculating the fire resistance of a reinforced concrete element, and in resource saving in fire tests.

9 cl, 3 dwg, 2 tbl