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

Abstract

In design of sandwich structures it is necessary to verify the following three sections: normal, diagonal and horizontal. Behavior of composite steel – concrete structures with external profiled reinforcement is directly dependant on deformability and strength of contact. In behavior of contact 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 is greatly influenced by shape of profiled sheet and contact precompression force. In experimental investigations contact was precompressed by force perpendicular to plane of contact. It was established by investigations that strength of contact between concrete and profiled steel sheet increases with contact precompressing force. Shear strain along contact reduces with the action of precompression force.