The building consists of basement, ground floor and 5 more storeys.
It features an asymmetrical plan view and an eccentric core – hosting staircases and elevator shafts – at the rear side of the building.
Our aim was to study and evaluate the adequacy of the building’s load-bearing structure, to strengthen the building against static and seismic loading, to upgrade its bioclimatic efficiency with the addition of thermal insulation on the facades and by that improve its architectural external views at the same time.
The morphology of the building does not allow interventions either inside or on its external periphery.
As a result, the statics design solution provided the strengthening of the exterior wall on the two free sides of the building and the strengthening of the staircase, with shotcrete jacket, in order to give the building, the required strength and rigidity in the event of an earthquake.
The “folded” shotcrete jacket was simulated as a “truss” for the statics analysis, with all the openings of the facades on which it is attached.
The analysis resulted in the calculation of the shotcrete’s reinforcement and of the additional necessary embedded steel profiles.
The jacket was fully fixed to the existing reinforced concrete frame with chemical anchors and steel rods and constituted a single, in full cooperation, load-bearing body.
In addition, local interventions were carried out internally were required, such as the construction of steel “capitals” on several column heads against punching.
The construction was completed in a short period of time, with the tutorial building in operation for the most of that time, safely and economically.