PRACTICAL WAY FOR DETERMINING THE FIRE RESISTANCE OF SQUARE REINFORCED CONCRETE SECTIONS WITH A SYMMETRICAL REINFORCEMENT, SUBJECTED TO BIAXIAL BENDING AND ALL-SIDED FIRE EXPOSURE

Beams and plates in reinforced concrete structures, subjected to internal, edge and corner columns to biaxial bending. Based on the simplified calculation method, “Isotherm 500°C,” in BDS EN 1992-1-2, are composed normalized interaction curves (nomograms) for determining the fire resistance of reinforced concrete square columns, subject of all-sided fire exposure. The nomograms are drawn up for columns, reinforced with four longitudinal bars at the corners of the section. Conclusions and recommendations are made for the practical application of the nomograms.Beams and plates in reinforced concrete structures, subjected to internal, edge and corner columns to biaxial bending. Based on the simplified calculation method, “Isotherm 500°C,” in BDS EN 1992-1-2, are composed normalized interaction curves (nomograms) for determining the fire resistance of reinforced concrete square columns, subject of all-sided fire exposure. The nomograms are drawn up for columns, reinforced with four longitudinal bars at the corners of the section. Conclusions and recommendations are made for the practical application of the nomograms