METHOD FOR ENSURING LOAD-BEARING CAPACITY OF REINFORCED CONCRETE RIBBED FLOOR PANELS OF BUILDING IN CONDITIONS OF PROLONGED FIRE Russian patent published in 2023 - IPC G01N25/50 

FIELD: fire safety of buildings and structures.

SUBSTANCE: invention can be used to classify reinforced concrete ribbed floor panels according to fire safety, to establish their use in buildings of a certain degree of fire resistance. The essence of the invention lies in the fact that fire testing of reinforced concrete ribbed floor panels of a building is carried out without destruction, according to a set of single quality indicators. To do this, determine the geometric dimensions of the reinforced ribbed panels; heating scheme for the design section in fire conditions, placement of the main and additional reinforcement reduced to conventional reinforcement bars in the design section, depth of placement and degree of fire protection of conventional reinforcement bars in the longitudinal ribs of panels, coefficient of thermal diffusion of concrete, intensity of force stress in conventional longitudinal reinforcement bars. The load-bearing capacity of reinforced concrete ribbed floor panels is determined by the value of the design fire resistance limit of the floor (Fu_(R), min). In describing the process of resistance of a reinforced concrete ribbed panel to the fire effects of a standard fire, the proposed method takes into account the degree of fire protection of the reinforcement, the intensity of force stresses, the thermal diffusion coefficient of concrete, as well as the features of additional reinforcement of the ribbed slab.

EFFECT: ensuring the load-bearing capacity of a reinforced concrete ribbed floor panel of a building in conditions of a protracted fire, eliminating full-scale fire tests when assessing the bearing capacity of a reinforced concrete ribbed panel in conditions of a protracted fire, as well as increasing the reliability of the results and reducing the time and labor intensity of obtaining results of assessing the load-bearing capacity of reinforced concrete ribbed panel in fire conditions.

3 cl, 3 dwg