Flexural performance of a lightweight composite floor comprising cold-formed steel trusses and a composite mortar slab

In this study, the flexural performance of a new lightweight composite floor constructed of cold-formed steel trusses and a composite mortar slab was tested. The average floor bearing capacity was approximately 15 kN/m2 at the mid-span deflection serviceability limit, and 22.5 kN/m2 at ultimate load. We obtained the ratio between the shear force applied to both the cement mortar and upper chord of the steel trusses, and the total shear force applied to the composite floor using a finite element model. We then proposed a theoretical method for determining the composite floor's deflection and bearing capacity, which agreed with the previous results. •A new lightweight cold-formed steel floor with a composite mortar is presented.•Bending tests on full-scale composite floor prototypes are conducted.•We develop accurate finite element models for the composite floor.•A theoretical method for determining the deflection and bearing capacity is proposed.