ULTIMATE BEARING CAPACITY FOR STEEL COLUMNS AFTER DAMAGE TO FIRE RETARDANT COATING IN FIRE

In order to understand the bearing capacity of steel column in fire after partial damage of fire retardant coating (FRC), calculation and analysis using differential equation of equilibrium are carried out to predict the bearing capacity of hinged steel column with initial flexure and load eccentricity suffering partial damage of FRC. The result is verified by employing ANSYS and good agreement is achieved. The parameters affecting the ultimate bearing capacity are analyzed, including damage length of FRC, temperature of column with damage of FRC, initial flexure, load eccentricity and slenderness ratio. The results show that the bearing capacity of column is reduced significantly when the FRC is damaged in fire, especially at the high temperature. Initial flexure and load eccentricity have great impact on the bearing capacity, but the influence decreases with the elevation of temperature. The bearing capacity is also reduced with the increase of slenderness ratio.