Investigating the Effect of Heat on Reinforced Concrete Frame Using Finite Element Software

The present paper examines the effect of heat on the reinforced concrete frame. A concrete frame with a specific geometric dimension has been modeled in ABAQUS finite element software and its loading capacity and other specifications, such as hardness and ductility, have been obtained. Then the concrete frame was heated under temperature 200, 400, 600, 800 and 1000°C and load capacities and coefficients were calculated. The purpose of the study is to investigate the effect of heat on the bearing capacity, hardness and ductility of concrete frames under the heat, which is important for the reinforcement of concrete structures against fire. The effect of heating on aggregates, tensions criteria and the modulus of elasticity of the rebar, as well as the strength and modulus of elasticity of concrete, have been applied through the ASTM E119 heating regulation. The results show that with increasing heat temperature, the load capacity of the frame decreases, which is very significant at temperatures of 800 and 1000°C. Due to the dependence of hardness and ductility on the initial displacement of the submission, the decreasing trend of the frames depends on the yield displacement. In the models under 800 and 1000, the hardness dropped sharply due to the collapse of the system.