EXPERIMENTAL STUDY ON BEHAVIOR OF UNPROTECTED FOAMED CONCRETE FILLED STEEL HOLLOW COLUMN UNDER FIRE

Reduction in self-weight and achievement of full fire resistance requirements are some the important considerations design high-rise structures. Lightweight concrete filled steel tube (CFST) column provides an alternative method to serve these purposes. Recent studies on lightweight CFST columns at ambient temperature have revealed that foamed can be a beneficial innovative material. Hence, this study investigates potential using circular hollow for improving resistance. A series nine test unfilled section were carried out. ISO 834 standard exposure out investigate structural response under fire. The main parameters considered load level density; density used 1500 kg/m3 1800 15%, 20%, 25% level. All tested without any external protection, with concentrically applied fixed-fixed boundary conditions. dimension was 2400 mm long, 139.7 diameter thickness 6 mm. result showed increases up additional 16 minutes. improvement is more above gain about 71% when used. Generally, demonstrate good behavior, based density. Also, inward local buckling averted by filling concrete. General composite Eurocode 4 adopted calculate axial columns. These type structures like airports, schools, stadiums; taking advantage exposed aesthetic purpose high It also rise structures; reduction structure.