| 摘要 |
FIELD: fire safety.SUBSTANCE: invention relates to fire safety of buildings and structures, in particular it can be used for classification of reinforced concrete trusses of buildings in terms of their resistance to fire. Core of invention: testing stretched and compressed elements of a reinforced concrete truss of a building without destruction as per a system of single quality parameters. That is ensured by an assigned system of single quality parameters of stretched and compressed elements; determined are the value of the test load and the intensity of bearing stresses in the working reinforcement. Limit of fire resistance of stretched and compressed elements is determined from corresponding analytical equations. Description of the process of resistance of the loaded elements of the reinforced concrete truss to the thermal action of standard fire is represented with mathematical relationships, which take into account integral heat engineering and structural parameters, as well as reinforcement features of the stretched and compressed elements.EFFECT: technical result is improvement of reliability of non-destructive tests, wider range of the method application, approximation of the test conditions to real ones.8 cl, 6 dwg, 2 tbl |
