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Abstract

ABSTRACT:

This paper presents research results on load-carrying capacity of reinforced concrete columns under different fire conditions (number of surfaces exposed to fire). To achieve this aim, reinforced concrete columns with a cross section of 300300 mm exposed to ISO 834 fire were simulated. The thermo simulations were performed using SAFIR software. The results of thermal analyses were used to analyze the axial load-carrying capacity of the columns using fiber model. The analysis results show that the fire duration significantly reduces the axial loadcarrying capacity of columns. In addition, fire conditions reduce the loadcarrying capacity of columns to different extents. Specifically, columns with four-side exposure have the largest reduction in load-carrying capacity. These reduction values are 3%, 9%, 16% and 22% for the fire durations of 15, 30, 45 and 60 min, respectively.

Keywords: Reinforced concrete column; fire; fire duration; fire condition