Bearing Capacity Of Centrally Compressed Reinforced Concrete Elements Corrosion-Damaged As A Result Of Fire Exposure

Abstract

Determination of the bearing capacity of the elements damaged as a result of fire effect depends on the accuracy of the thermo-technical calculation. After this calculation, the distribution of the temperature field over the cross section of the element and the strength characteristics depending on it are determined. The temperature distribution over the cross section of the element depends on such parameters as heat capacity and thermal conductivity of parts of the section, the spatial position of the structure, its humidity. As part of this work, heat engineering calculations of the cross section of the reinforced concrete column were performed with various options of the cross section - with and without a protective layer, taking into account the thermal performance of all cross section components (reinforcement, concrete and corrosion) and excluding corrosion and reinforcement. Based on the obtained temperature fields, the bearing capacity and its percentage ratio were calculated. The main conclusion is that the bearing capacity of the centrally compressed corrosion-damaged elements is significantly influenced by the factor of separation of the protective layer of concrete, as well as thermal-technical characteristics of materials.