Análise de pilares de concreto armado em situação de incêndio

Abstract

Reinforced concrete buildings in Brazil are the most common, with concrete being a material with good resistance to fire, as it is not combustible and has low thermal conductivity. However, continuous exposure of the material to fire can cause the structure to collapse.The design of reinforced concrete structures is based on the Brazilian standard ABNT NBR 6118: 2014 “Projeto de estruturas de concreto — Procedimento” (Design of concrete structures - Procedure). The actions caused by fire are not present in this standard, therefore the Brazilian standard ABNT NBR 15200 “Projeto de estruturas de concreto em situação de incêndio” (Fire Design of concrete structures) was designed so that the structure also be verified in a fire situation and compliance with the requirements of ABNT NBR 14432 "Exigências de resistência ao fogo de elementos construtivos de edificações” (Fire-resistance requirements for building construction elements - Procedure). This work presents the calculation methodology for the fire design of concrete columns and develops a practical example of the analysis of the columns in a building, where it is possible to verify the structural safety of the columns in a fire situation.