Buildings with the most diverse purposes are subject to extreme events, such as vehicle impact, explosions, and sudden loss of members essential to their stability. Progressive collapse can be defined as the process in which a localized damage leads to chain failure, causing the fall of an entire building or a large part of it. The sudden loss of an essential member due to exceptional loads can trigger the progressive collapse of a structure, causing enormous human and economic damage. Progressive collapse is a dynamic nonlinear phenomenon, so its modeling is complex. The most employed technique for evaluation of progressive collapse is the alternative load path method, which verifies the structure behavior after the sudden loss of a load-bearing element, checking its stress redistribution capacity and strength to load increase in critical situations. This work realized successive analysis of structural models of a reinforced concrete building, adopting a progressive complexity to each of them, using the alternative path method. At the end, the effectiveness and importance of each of the analysis steps employed at work were analyzed. The structure designed acoording to the reinforced concrete brazilian standard needed adjustments to meet the minimum resistance requirements of progressive collapse.