Fire Resistance of High Strength Concrete Columns with Design Strength 120 MPa

설계강도 120 MPa 고강도 콘크리트 기둥의 내화 성능

An experimental investigation was earned out to evaluate the fire performance of high strength concrete column made with different section size. Two different high strength concrete columns measuring 3,428mm in height and with the same tie spacing of 150mm were prepared to evaluate the effect of section size of $305{\times}305mm$ and $500{\times}500mm$ on the fire resistance. Compressive strength was 138MPa at the time of fire resistance fire testing. Based on the test result, fire resistance of column with the larger section of $500{\times}500mm$ exhibited the better performance than that of the smaller section of $305{\times}305mm$. The former withstood against the very high temperature over 240minutes, while the latter resisted during 176minutes.