Integrated analysis of light gauge steel beam sections enhanced by steel fiber reinforced concrete: a comprehensive study on structural and thermal performance

This study delves into the utilization of advanced materials to enhance the mechanical characteristics and longevity of concrete structures, with a specific focus on the performance and design of beams composed of light gauge steel hollow sections (LGSHS) filled with steel fiber-reinforced concrete (SFRC) under flexural conditions. SFRC, known for its exceptional fire resistance, emerges as a promising alternative to Ordinary Portland Cement (OPC) in elevating concrete properties. The experimental and numerical findings consistently demonstrated a noteworthy 12% increase in maximum loading capacity, exhibiting a consistent curved trend at the moment against mid-span displacement when employing the composite material. Finite Element Analysis (FEA) modeling was used to scrutinize core concrete failure patterns, residual displacements of external metal during the load-carrying process, and load distribution patterns throughout the structural element. The infusion of SFRC into light gauge steel sections was found to enhance load-carrying capacity, ductility, and toughness. This paper scrutinizes the mechanical properties and structural behavior of LGSHS filled with SFRC, encompassing steel and concrete properties, member geometry, and response to fire exposure. The primary objective is to assess the load-deformation characteristics of rectangular hollow beams formed by concrete-filled steel tubes (CFST) filled with SFRC. The investigation aims to determine load-carrying capacity, strain, deformation capacity, ductility, and failure characteristics under ambient and elevated temperatures.

Keywords:
CFST Beams; Steel Fibers; Steel Fiber-Reinforced Concrete (SFRC); Finite element analysis (FEA); Ambient and elevated temperatures