Flexural Behavior of Cold-Formed Steel Composite Floor Infilled with Desert Sand Foamed Concrete

Desert sand foamed concrete (DSFC), which offers advantages, such as fire resistance, sound insulation, construction convenience, and environmental benefits, has not been used in cold-formed steel (CFS) composite floors. In this study, four full-scale specimens were designed tested under four-point bending to investigate the effect of filling holes. The load–deflection curves strain distribution at mid-span measured analyzed. experimental results indicated that failure modes CFS floors local buckling top flange for without holes tensile bottom with holes, respectively, differed from web crippling observed non-composite Moreover, due presence concrete, flexural stiffness was significantly improved by 117.6% 73.6% while ultimate capacity increased 224.9% 121.8%, respectively. Through nonlinear finite element models validated against results, it found behavior increase thickness strength. impact obvious infilled