Percentile influence of beam column cross-sectional design on progressive collapse potential of low-rise reinforced concrete framed structure

The potential for progressive collapse of structures has been a subject of growing concern in the field of civil engineering. As such, this study aims to investigate the behaviour of low-rise, four-story RC-framed structures when subjected to abnormal loads, particularly missing column scenarios. To accomplish this objective, the study utilizes over 20 unique models with varying beam and column cross sections and designs them for India’s four seismic zones (II, III, IV, and V) by IS 456-2000 and IS 1893-2016 using FEM-based ETABS V.17 Software. Through linear static analysis, the study evaluates the potential for progressive collapse of structures in all three possible cases of column removal, as per the GSA Guidelines. The study aims to determine the progressive collapse potential of low-rise reinforced concrete framed structures designed for Indian seismic zones and assesses the percentile impact of different beam and column cross sections on the structure’s collapse potential. The results show that structures designed for high seismic zones, such as seismic zone V with high beam column cross sections, have greater progressive collapse resistance, whereas those designed for low seismic zones, such as seismic zone II with low beam column cross sections, have lower resistance. Behaviour of critical columns (flexure) using column interaction diagrams for GSA load-generating internal force and quantifying the effect on material quantities like concrete and longitudinal reinforcement is also studied. The significance of this study lies in its potential to aid in the development of improved design criteria for the integrity of beam column joints for structures subject to progressive collapse scenarios in Indian seismic zones.