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An Experimental Study on the Fire Behavior of CFT Column under the Constant Axial Loading Condition in Fire  

Kim, Hyung-Jun (한국건설기술연구원)
Kim, Heung-Youl (한국건설기술연구원)
Min, Byung-Youl (한국건설기술연구원)
Kwon, In-Kyu (강원대학교)
Kwon, Ki-Hyuk (서울시립대학교)
Publication Information
Fire Science and Engineering / v.24, no.6, 2010 , pp. 69-75 More about this Journal
Abstract
A concrete filled square steel tube (CFT) is composed of the external steel material, which its strength is reduced in fire due to sudden temperature increase, and the internal concrete with high thermal capacity that can ensure the fire resistance performance of the structure. Therefore, research about the influence factors of the structural performance of CFT column is required in order to apply CFT column to a fire resisting structure, and additional research about influence for each condition is also necessary. Among the influence factors, the boundary condition between column and beam is important structurally, and it is one of the major factors that determine overall fire resisting performance. This study performed a fire experiment under loading in order to analyse the influences of CFT column to the boundary condition. As the results of the experiment, fire resistance time of 106 minutes was ensured for the clamped-end condition but 89 minutes for the hinge-end condition in case of the 360 cross section. And, fire resistance time of 113 minutes was ensured for the clamped-end condition but 78 minutes for the hinge-end condition in case of the 280 cross section.
Keywords
CFT; Column; Boundary condition; Fire resistance; Structure;
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