Finite Element Analysis Modeling for Predicting Fire Resistance of Eccentrically-loaded Reinforced Concrete Columns

In order to predict the fire resistance of reinforced concrete (RC) columns, a three-dimensional finite element analysis modeling technique was developed considering the axial load ratio, eccentricity, and end-rotation constraint. The fully coupled thermo-mechanical analysis method in Abaqus was used for the modeling, and the modeling was verified by comparing with ten test specimens subjected to concentric or eccentric load. Although there were some differences due to the relatively high axial load ratio, eccentric load effect, and end-constraint, the modeling gave conservative results in terms of temperature distribution, axial deformation, and fire resistance rating. These results indicate that the proposed modeling technique can be used in the fire resistance design of RC columns.