New residential building in Carducci street, MILANO

A residential building with high quality standard composed of 3 underground levels for parking, storage, technical rooms and services and of 8 elevated floors for dwellings topped by a terrace with a swimming pool and featuring at ground level areas for office use and reception for a total of around 6.000 m2 of horizontal surface subdivided in 2000m2 underground and 4000m2 in elevation.

The works include the total demolition of the existing building and the construction of the new edifice with two underground levels added to the existing one.

The design had to take in account a complex demolition phase aimed ad preserving the stability of the border walls that, in lack of a joint, constitute the partitions from the adjacent more recent edifices but are not connected to the relevant structures.

In order to effect the above said wall stability a steel retaining system was designed and planned for stepped erection during the demolition works of the existing building and for the inverse phases during the construction of the new one.

The perimeter of the underground volume is lined with a curtain of micropiles braced by steel struts because, due to the presence of the adjacent constructions and of a metro line, the use of ground anchors is not possible.

All the structures are in reinforced concrete with floor plates 0.26m deep with the exclusion of the first underground level where the relevant depth is increased to 0.50m; the plates are solid up to the street level and include plastic voiding boxes above it.

The first underground level plate transfers the vertical actions of the above ground columns to the parking partition walls that are not aligned with the structures in elevation; the stair and elevator core is continuous from the foundation up to the roof.

A reinforced concrete continuos raft 0.60m deep constitutes the foundation.

The above ground construction is divided into two buildings, one in front of via Carducci and the other one in front of via Terraggio, that are connected by the the stair and elevator core and on the opposite side by a r.c. frame integrated in the architectural masking of the blind wall of the adjacent edifice.

The resistance to the horizontal actions is effected by the r.c. core walls and by frames with shear walls and transverse beams deeper than the floor plates that act as at level diaphragms; the columns, with hinged ends, resist the vertical loads and as secondary elements contribute to the seismic resistance.