POST-FIRE BEHAVIOR OF CROSS-SHAPED STEEL REINFORCED CONCRETE COLUMNS: SIMULATION AND ANALYTICAL EXPRESSIONS

Abstract

In order to explore the behavior of cross-shaped steel reinforced concrete (SRC) columns after fire, the heat transfer analysis model and structural analysis model were established by ABAQUS software. The simulation results of the cross-shaped column were compared with the existing test results, in the aspect of the temperature distribution, time-temperature curve, failure mode, and load-displacement relationship after fire exposure. The results show that the simulation results agree well with the experimental results. The influence of critical parameters on residual bearing capacity coefficient k was discussed, which including constant heating duration, maximum heating temperature, concrete strength, yield strength of section steel, yield strength of rebars, limb thickness, effective column length, rebar diameter, and steel content. Finally, a simplified formula was proposed to calculate the residual bearing capacity of cross-shaped SRC columns after fire.