Análise numérica de edifícios de concreto armado em situação de incêndio

Abstract

The various catastrophes caused by fires over the years in multistory reinforced concrete buildings have increased the need to understand and research the behavior of structural elements when exposed to fire. Currently, the recommendations and simplified procedures for the design and verification of the structural safety of these fire-reinforced concrete structural elements are determined by the current standards that cover this area of study, such as NBR 15200:2012. In this way, the main objective of this work is to carry out a computational modeling of a multi-storey building in reinforced concrete with the aid of the CAD/TQS program, correctly dimensioned for ABNT NBR 6118: 2014 - Design of concrete structures, to carry out verification of the structural safety of reinforced concrete pillars, beams and slabs in a fire situation, as defined by the Brazilian standard ABNT NBR 15200:2012. Through the results of all structural elements of reinforced concrete against the verification of fire present in the computer program, it was observed that in the 5 hypotheses of fire located on the floors, the same pillars - P1, P3, P4, P6, P7, P12 , P13, P15, P16 and P18 - did not pass the structural safety checks for the flooring Coverage in the two envelopes used. As well, the 'ELU1' envelope detected that in the typical floors, the pillars P15 and P16, did not obtain a satisfactory result in the verifications. The descriptive reports collected from the 'Fogo' and 'ELU1' envelopes brought positive results, assuming that both had very similar results in the verifications. It is also observed that none of the beams or slabs for any of the checks carried out for the 5 hypotheses of fire situations, obtained the result of being not dimensioned.