Teses #column

Reinforced concrete columns are very important elements in structures in fire. Their collapse may affect very much the equilibrium and stability of the complete structure. In structural elements analysis is very important to consider the interaction with other elements of the structure. However, the behavior of the structural elements is usually considered as isolated, without considering any interaction. There are many studies of reinforced concrete columns in fire situation considering them as isolated. However, there are too few considering the interaction with beams and frames that are typical from buildings. This doctoral thesis studies reinforced concrete columns in fire situation considering the interaction with the structure. In the analysis, material non-linearity, concrete cracking, and mechanical properties of concrete and steel variation as a temperature function, e.g. strength and young’s module loss and the stress-strain curves varying with temperature are considered. In addition, variations of the thermal properties are considered, e.g. specific heat, thermal conductivity, and thermal elongation. Some structures configuration combined with the concepts given before are analyzed with specialized software, including some own codes.