Modeling of reinforced concrete columns loaded with fire

The development of cars, especially their electrification, also determines the question of what happens in the event of a fire of a car or its batteries in shared garages of apartment buildings. The fire of cars in an enclosed space of an underground garage can now be modelled more accurately due to the improvement of numerical models (CFD simulations, fire dynamics simulator FDS), as well as an extreme increase in computer performance. We can use more fire load curves in the combustion analysis. When calculating the effects of fire on a reinforced concrete cross-section, a homogeneous concrete cross-section is considered in the mathematical-physical model. In this article we compare the solution of a homogeneous reinforced concrete cross-section under load with different fire curves. The first part of the article presents the material properties of the reinforcing steel and the concrete itself as a function of temperature. In the second part we deal with the load curves of various fires. The two load curves are taken from the EC standard and the third is taken from the literature. The third curve shows the burning of the battery and the entire electric car. The core of the article is the analysis of reinforced concrete cross-sections of concrete columns under temperature load. The differences obtained in the calculation of the homogeneous cross section loaded by the three types of curves are compared. The results are isotherms bound to individual time points of the solution. The article concludes with a comparison of the resistance of the concrete cross section to different types of fire.