International Civil Engineering & Architecture Conference (ICEARC'19), Trabzon, Turkey, 17 - 20 April 2019, pp.1252-1261
Engineering structures can be exposed to high temperature effects due to fire and similar reasons during their lifetime and they can lose their strength significantly. This case suggests that structural behavior of structures under high temperature effects should be evaluated. If failure has not occurred, structural damage status and the decision on whether to continue the use of the structure are very important. Because, there is a certain degree of decrease in the strength and stiffness of the structural elements. Within this scope, studies are carried out to determine the dynamic characteristic (natural frequency, mode shape and damping ratio) changes that will occur due to fire or similar high temperature effects, to make damage estimates and to determine the usage status due to the changes in the stiffness. This study was carried out to expand the studies on “Temperature Effect in Structural Health Monitoring”. In the study, the changes in natural frequency values of the first two modes of reinforced concrete columns exposed to fire from all side surfaces were examined and the data obtained as a result of numerical analysis were evaluated comparatively. As a result of the investigations, it is observed that the increase in duration of exposure to the temperature caused a decrease in natural frequency values of the columns. It is also understood that the size of the column cross-section is effective in this reduction amount.