METHOD FOR EVALUATING FIRE RESISTANCE OF BEAM STRUCTURE Russian patent published in 2018 - IPC G01N25/50 

FIELD: fire safety.

SUBSTANCE: invention relates to fire safety of buildings and structures. Method for evaluating the fire resistance of a steel corrugated wall, stretched and compressed reinforced concrete belts of a composite beam of a building without compromising its suitability as per a set of single quality indicators is proposed. For this purpose, designated is a set of single indicators of quality of the corrugated wall, the stretched and the compressed belts; determined are the value of the design test load and the intensity of force stresses in the metal of the corrugated wall and in the working reinforcement of the stretched and compressed reinforced concrete belts of the composite structure. Duration of the resistance under the conditions of the thermal action of the steel corrugated wall, the stretched and the compressed reinforced concrete belts of the composite structure are determined by analytical dependences (2), (10) and (14). Description of the process of resistance of loaded elements of the composite beam to the standard thermal effect is represented by mathematical dependences, which take into account the heat engineering parameters, as well as the structural features of the corrugated wall and the reinforcement of the stretched and the compressed reinforced concrete belts.

EFFECT: technical result is an increase in the accuracy of the fire resistance of a steel corrugated wall, stretched and compressed reinforced concrete belts of a composite beam without a full-scale fire impact; as well as an increase in the accuracy of the design fire resistance of the composite beam as a whole and the determination of the time of resistance to the fire action of the least weak in terms of fire resistance of its element.

8 cl, 6 dwg, 2 tbl