Dimensionamento de um edifício para situação normal de temperatura e para situação de incêndio: uma análise comparativa

Abstract

Currently the use of ABNT NBR 15200: 2012 for fire design of concrete structures is restricted by most structural designers, greatly reinforced by the taboo that its application can make a building economically unviable. Despite being an exceptional situation, the fire has devastating consequences that endanger human lives. It is essential to expand studies in this area, reinforcing the importance of the subject matter and empirically quantifying its differences from ABNT NBR 6118: 2014 for design of concrete structures in normal temperature. This undergraduate thesis, besides making a bibliographic review of the subject, uses the TQS program to design a residential building for the two situations exposed, comparing the structural, consumption and economic results. In fire design, a decrease in γz was observed, even with the increase of the load related to the concrete's own weight, due to the increase of its dimensions. Consumption of concrete and steel also increased, highlighting the slabs that had the largest increases. Consequently, the cost of inputs also increased when designed for fire situation. For the residential building used in this final paper, although the fire standard caused increases in the dimensions of the structural elements and the acting loads, there was a decrease in the γ_z, ensuring a greater overall stability of the building and bringing it closer to a fixed node structure. Compared to the estimated total cost of the work, the use of the fire standard represents 5,33% of this total cost, i.e., its use may be economically viable