‘Investigation of Shear Transfer mechanisms in Repaired Damaged Concrete Columns Strengthened with RC Jackets

Numerous techniques have been applied in upgrading and rehabilitating the capacity of crucial reinforced concrete (RC) elements, such as columns. Jacketing with various materials such as FRPs and reinforced concrete jackets (high strength concrete, self-consolidating, etc.) is commonly used in seismic retrofitting 0, 0, 0, 02006). The key of the strengthening design has proven to be the interface capacity in transferring loads and to slip 0, 0, 0, 0). For this reason it is commonly adopted the treatment of the interface with various methods 0). Either by increasing the roughness 0) of the surface or by applying bonding resins 0) or even finally by placing steel connectors of various kinds 0, 0) the interface capacity is considered to be enhanced 0, 0). Various codes world-widely 0, 0: Greek Retrofit Code Attuned to EN 1998/3, 0 do not quantify the resistance load of elements repaired with each rehabilitation method. Moreover, in all published studies the variable overloading effect 0, 0 is usually examined, though, the factor of extensive construction damage in combination with loading influence is not very analytically referred to 0, 0). It is decided to quantify and examine the influence of the latter factor to the interface surface in bearing and transferring loads. Together with the initial damage factor, the kind of connectors placed at the interface is studied. Dowels and bend down welded bars were selected to connect the interface of the jacketed elements.