Análise de colapso progressivo para um edifício com estrutura de concreto armado

Abstract

Progressive collapse is defined as a structural failure that starts from a local failure and can propagate to all or part of the structure. Little discussed in Brazilian regulatory norms, the phenomenon has been known for more than 50 years and can bring great losses and fatalities. Computational software has proved to be great tools to assist the structural engineer with the possibility of performing different analyses and simulations in a structure in order to verify their propensity to propagate collapse. In this work, it is proposed to study the propensity for progressive collapse of a reinforced concrete building, using the recommendations of the General Services Administration (GSA) of the United States. GSA prescribes the removal of several columns of the building, one at a time, in order to analyze the behavior of the structure, using Demand-Capacity Ratio (DCR) to evaluate the load redistribution, after those elements loss. Eberick V9 software, was used to size and simulate the scenarios of loss of the elements, this software is commonly used in the design of reinforced concrete structures in Brazil, based on NBR 6118: 2014. The analyses were performed using static linear analysis, applying loading combinations that consider the dynamic effects of progressive collapse from a multiplication factor. The results obtained for the analyzed cases showed that the building designed by Eberick V9 was not able to absorb loads coming from the loss of a column and would most likely propagate the failure until the collapse reached the entire structure.