BEHAVIOUR OF MONO-STUD PLATES IN CRACKED CONCRETE UNDER SHEAR LOADING

Anchor plates are commonly used in nuclear power plants as connection between equipment and reinforced concrete structures. These anchoring solutions are usually cast-in place, thus the steel plate is embedded in the concrete. The contribution of the embedded plate is usually neglected in calculation codes however, in this study, it is demonstrated that its contribution is noticeable. Classic anchor plates typically have four fasteners, thus complicating the installation with high density of reinforcement. New specific solutions with only one headed anchor are investigated in this paper: a more classic solution made with a single stud welded in the centre of the steel plate, and a more innovative one made with a piece of an IPE profile, welded in the centre of the steel plate. An experimental campaign was carried out in order to investigate the shear behaviour in cracked concrete with different boundary conditions. Confined and non-confined conditions were applied in order to manage the failure mode (steel failure of the stud or concrete edge failure) and in order to control the border effect of the embedded plate (with or without contact between concrete and edge plate). The contributions to the shear capacity of both stud, concrete and plate are evaluated. Finally, experimental results are compared with Concrete Capacity Design (CCD) method.