Abstract:

Analyzed in this paper were the influences of several parameters , such as the load ratio , the effective column length , the sectional dimensions , the load eccentricity ratio , the reinforcement ratio and the loading angle on the fire resistance of reinforced concrete columns with L-shaped cross section exposed to the IS0834 standard fire , and 5400 columns subjected to fire in all sides were used to caπY out the fire response analyses , with the above- mentioned parameters being the variables. Based on the analytical results , a practical method to calculate the fire resistance of the column with L-shaped cross section was presented. The results show that the loading angle has significant and complicated effect on the fire resistance of the column , and that reducing the load ratio is an effective method to improve the fire resistance.

Key words: concrete, reinforced concrete column, fire resistance, calculation, L-shaped cross section