The document discusses controlling progressive collapse in structures using shear walls. It analyzes an irregular multi-story structure using ETABS software with different column removal cases, including corner columns, middle columns, and interior columns. Demand capacity ratios are calculated and found to exceed safety limits without intervention. Shear walls are added near accidentally collapsed columns, reducing demand on surrounding members and controlling progressive collapse. Graphs show demand capacity ratios decrease with shear walls and remain below safety thresholds of 1.5. Shear walls effectively distribute loads and stiffen the structure after column loss events.