Determination Of Physical And Mechanical Properties Of Reinforced Concrete Steels During High Temperature

In this study, the effects of high temperature conditions that bring about with fire and the usage of in the building were investigated according to reinforced concrete steels. Steel grade B420C was used in the study. The reinforced concrete steels used in the operation are 12 mm in diameter. Three loading conditions were chosen: 0, 290 and 365 MPa but whose characteristic yield strengths have not been exceeded. Depending on the thickness of the concrete cover and the duration of the fire, the temperatures such as 75, 150 and 300 °C were taken into account for the heat to reach the steel surface. The physical and mechanical properties of the samples were determined before high temperature. These steels were applied with hot air guns while high temperature samples were connected and held in the calculated stress state. With thermo detector and thermal camera, the samples reaching the target temperature were subjected to reloading and the experiment were continued until the sample breaks. It has been determined that the preliminary loading and temperature conditions have resulted in significant changes in the characteristics of the steel. In the light of these studies, the effects on the reinforced concrete steels during the fire were obtained for the current building structure and design phase, and the progression of the reinforced concrete steels after the fire.