Influence of precompression force on strength and deformations of contact between concrete and external profiled reinforcement

Abstract

In designing composite structures it is necessary to verify the following three sections: normal, diagonal and horizontal. The behavior of composite steel - concrete structures with external profiled reinforcement is directly dependant on deformability and strength of contact. Contact behavior between concrete and profiled steel sheet, three stages are distinguished, the first - until chemical bond is effective, the second - after failure of chemical bond, the third - after failure of mechanical bond when composite action is provided by friction and anchors. Deformability and strength of contact is greatly influenced by the shape of the profiled sheet, precompressing force acting perpendicularly to a contact plane and horizontal forces restraining transversal strains of concrete. It was established by investigations that a shear strength of contact between concrete and profiled steel sheet increases and shear strain decreases with an increase of contact between concrete and sheet precompressing forces and concrete transverse strain restraining forces.