Progressive Collapse Study of RC Frame Building with Removal of Column at Different Locations

Progressive collapse is nothing but failure of structural member step by step due to accidental or earthquake load. Literature emphasizes the criticality of understanding load redistribution mechanisms and structural robustness, particularly in multi-storey reinforced concrete (RC) buildings. Paper presented here is taking into account a study of G+7 regular buildings to know the reasons for failure of building under accidental loads like earthquake. Response spectrum analysis with soil type II (medium soil) as per IS 1893 is considered for the analysis purpose. Alternate Path method with nonlinear staged collapse is adopted as per General Service Administration (GSA) and Unified Facilities Criteria (UFC) guidelines, USA considering different column removal cases both in elevation and plan. Based on demand capacity ratio (DCR) it is inferred that the removal of middle column alone at ground floor from both long and short side has partially affected the performance of building. While, removal of middle column at ground and mid (4th) floor level shows tendency of partial or complete collapse of building.DCR values for all columns is below 1, indicates that it has capacity to redistribute the moment to the adjoining members.