earticle

영어

A concrete filled steel tubes(CFST) has many merits such as a higher load-bearing capacity and a better fire resistance performance than the ordinary steel columns not equipped with another structural materials. But the recent steel based high building requires that the stronger and the higher performance in aspects of fire resistance because the higher the building is the more risk occur.
At this paper, to get data for a CFST reinforced by steel bars, two kinds of tubes such as round, rectangular were used and the two sorts of concrete grades, 21MPa and 35MPa, were poured and SBD 24 deformed bar applied as a main bar, a stirrup and two load ratios. After fire tests with loading, the fire resistance of 180 minutes were shown through round section, 30% of load ratio and compressive strength 21MPa. The fire resistance from round section is higher than that of rectangular for its geometric shape. The
temperature of steels embedded into the sections is guessed that it has a relationship among applied load ratio, limit temperature and fire resistance.