Behaviour of Light Gauge Steel Hollow Columns and Beams in Filled with Steel Fiber Reinforced Concrete Subjected to Iso Standard Fire

Abstract

Concrete-Filled Steel Tubes (CFST) are increasingly popular in construction newlinefor buildings, bridges, and electric towers due to their superior performance, primarily newlinebecause of the confinement effect of concrete within the steel tube. CFST efficiently newlinecarry axial loads through the concrete core, with the steel tube enhancing structural newlineefficiency and cost-effectiveness. The research underscores the importance of assessing newlineCFST behaviour under high temperatures, as ISO Fire temperatures can significantly newlineimpact structural durability, posing risks to materials and safety. newlineTo improve fire resistance, light gauge steel tubes and various concrete newlineformulations are used in CFST sections. CFST are valued for their high load-carrying newlinecapacity and compact design, which can reduce the size of columns in tall structures and newlinesave floor space. Despite their benefits, the fire resistance of CFST sections requires newlinethorough evaluation. Although CFST have been studied for over 50 years, their newlinebehaviour under different loading conditions is not fully understood. Additionally, newlineincorporating steel fibers into concrete enhances properties like fracture energy, flexural newlinetoughness, tensile strength and fire resistance, though there are challenges related to the newlineperformance of fibers at high temperatures newline