An Experimental Study on Fire Resistance of High Strength Concrete Columns according to Structural Fire Design

Abstract

In Korea, in the event of performing fire-proofing work on concrete columns with strength of 50 MPa and above, an assessment of the fire-resistance performance must be carried out in accordance with the Ministry of Land, Transport and Maritime Affairs Notice 2008-334 'Standards for Management of Fire-resistance Performance of High-strength Concrete Columns and Beams.' However, the current standards only prescribe the need to check whether the testing report is submitted during the performance of fire-proofing work. This may pose difficulties in managing the fire-resistance performance in cases where it is impossible to identify whether such work has been done with a naked eye as is the case of the fire mixing method. Thus, in this study, three types of structurally reinforced specimens were fabricated for a fire-resistance performance test in order to propose a structural reinforcement technique that would facilitate the identification of the technique implemented in the field. The structural reinforcement techniques employed in this study were the method of increasing the amount of reinforcement and cross section in accordance with the Euro Code, the metal lath reinforcement method, and the method of increasing the amount of horizontal reinforcement. The strength of concrete used in the experiment was 70 MPa, the standard for design strength.