теза Hierarchical approach to the calculation assessment of fire resistance of reinforced concrete beams

Abstract

The study on fire resistance assessment was carried out on a reinforced concrete beam with a cross-sectional area of 300x600 mm, rectangular in cross-section, with a single two-row reinforcement: 4Ø22A400S. The beam was made of concrete of class C30/35, the distance to the axis of the lower level of reinforcement was 50 mm, to the axis of the upper level of reinforcement - 120 mm, the level of the operating load was 0.5 of the destructive load. The heating conditions were taken from three sides. The compliance of the fire resistance class of the studied structure with R120 was checked using the tabular and zone methods.