Análise térmica de concreto submetido a temperaturas elevadas através de modelagem numérica

Abstract

With the large increase in population, the demand for buildings and infrastructure grows exponentially, and with it risks gradually emerge. Therefore, it is necessary to use a malleable and highly resistant material that can withstand different types of risks, namely concrete. Among the risks that concrete must be able to withstand, fire accidents stand out, which ended up getting worse due to the extensive use of electronic devices aimed at improving the quality of life. Bearing this factor in mind, research into improvements to the concrete structure becomes more relevant, and results are needed to distinguish what is positive and negative when dealing with concrete in situations of high temperatures. Therefore, the present research aims to study experimental results through numerical modeling studying the thermal behavior of concrete raised to high temperatures with different types and exposure times. From the compared results, a large difference was observed between the curve with greater exposure, where the concrete was able to achieve uniformity of the thermal field, thus presenting a fixed resistance reduction rate for the simulation in question. As for the standardized fire curve, there is an apparent difference in temperature from the inside to the outside.