Studi eksperimental dan analisis empirik performa sambungan sistem lantai komposit cold formed steel-plywood

Abstract

A composite floor system consisting of cold-formed steel (CFS) and plywood could be an alternative to concrete floor systems. However, there are still a few design calculations which include the influence of connections for this floor system. This is due to the lack of research regarding the behaviour of CFS-Plywood connections. Therefore, this study presents an experimental investigation into the behaviour of the connections that were used. Two different shear connection types, selfdrilling screw and adhesive epoxy were examined and compared. Material testing was carried out in this study to obtain the mechanical properties of the materials and single shear tests were conducted to determine failure modes, load-displacement behaviour, ductility, slip modulus, and shear modulus of both connection types. The experimental results indicated that composite system which connected by self-drilling screw has higher ductility than system with adhesive epoxy. Furthermore, the slip modulus and shear modulus were employed in empirical analysis to calculate the effective bending stiffness of the designed floor system. The results showed that the 2,4 meters CFS-plywood floor system using adhesive epoxy provided 63,4% increase in bending stiffness compared to CFS joist's bending stiffness. This value significantly surpassed the increase of bending stiffness provided by system using self-drilling screw, which was 5,4%. Increasing bending stiffness of the composite floor system results in reduced vertical deflection, so it could be more easily to meet the design criteria.