Ultimate strength capacity of a square hollow section filled with fibrous foamed concrete

Abstract

Abstract. Concrete-filled sections used as building columns have become popular due to their architectural and structural elements. In recent years, there has been a renewed call for the improvement of materials used as concrete to fill the composite columns. Among these materials, foamed concrete has received great attention due to its structural characteristics and its potential as a construction material used in hollow sections. However, its behaviors as infill material in a hollow section, such as its strength and failure mode, should be investigated. In this study, experimental research was conducted to compare the experimental and theoretical values of its ultimate strength capacity. Eight specimens of hollow steel sections with two different thicknesses were filled with fibrous foamed concrete and then subjected to compression load. The obtained results were compared with those obtained from a hollow section with the same thicknesses, but were filled with normal foamed concrete. Results show that the ultimate strength capacity of the experimental value is the same as that of the theoretical value based on Eurocode 4. The largest percentage values between theoretical and experimental results for thicknesses of 2 and 4 mm are 58% and 55%, respectively.

Strength of Reinforced Fibrous Foamed Concrete-Filled Hollow Section

“…The addition of fibre to the CFHS increases the ultimate load. The inclusion of fibre improves the ultimate load capacity and the deformation and ductility of CFHSs [8,9].…”

Performance of Modified Foam Concrete-Filled Column Hollow Sections

“…A study by Khairuddin et al [23] on CFHSs using SFs in short columns found that adding rice husk ash (ASH) resulted in good strength and bonding between concrete and SHSs. According to Bhuvaneshwari et al [24] and Jaini, Rum, and Boon [25], using RHA as a sand replacement in FC increased compressive strength due to the high pozzolanic reaction and ability produced by RHA.…”

“…Meanwhile, SF was added at 0.8% of the total material. The percentage of RHA and SF in the mixture was suggested by Khairuddin et al [23] under the optimal strength of modified concrete. Table 1 shows the mixed design for the FC.…”

“…The ductility of CFHSs increases when D/t decreases [12]. According to Khairuddin [13], filling hollow sections with lightweight concrete, such as foam concrete (FC), yields CFHSs that are more malleable than CFHSs filled with normal concrete. The DI is calculated by using Eq.…”