Post-fire resistance of concrete filled steel tube columns

Abstract

Abstract Basically, columns of CFST ( Concrete-filled steel tube) are a common technique to increase the carried compressive forces in the frame. These columns are very effective method of composite building. The behaviors of these columns due to several various loading types have been well studied. This study investigated the CFST columns in order to advance their post-fire resistance. A standard fire exposure was used to examine columns without and with concrete. In order to study their performance after fire, fire exposed samples and specimens without fire exposure in total 6 samples were examined by concentric compressive load to the failure. Samples of CFST column were cast by high performance self-compacting concrete. The obtained results showed that concrete with steel tube provides very high post-fire resistances. Generally, certain configurations achieved post-fire resistances significantly higher than that CFST samples without fire exposure. The results of this work supply novel insights and suggest cost effective solutions to enhance the execution of concrete- filled steel tube columns that subjected to ambient temperature and due to fire exposure.