The structural system of
the hangar is mainly formed by:
- ten parallel twin
trusses longitudinally oriented
- three transversal
composite portal frames
- a suspended system of external
- a roof deck covering system
The parallel 300 m longitudinally oriented twin trusses,
supported on three main transversal box girders, are positioned
with a relative separation of 9,115 m. The trusses have a parabolic
curved top flange, with a height varying from 3,5 meters at the
ends to 12,5 meters at the center, and a bottom horizontal flange
(fig.3). The upper chord geometry facilitates the rain drainage.
Two couples of twin trusses are then both connected, with vertical
and horizontal bracings, in order to finally obtain a self out
of plane stabilizing space frame.
Five reticular space frames, forming the principal structural
system (fig.4), are supported on transversal oriented frames formed
by 4 box-section concrete columns and a steel box-section continuous
beams, with three spans 27,5 meters each (85 meters long), positioned
along the two lateral gable walls and the axis of symmetry of
Because of their principal structural role and critical cantilever
action, the central columns are designed as very strong hollow
box section (6,0 * 3,0 meters) founded on concrete piles.
In the transverse direction, seismic and wind forces are
resisted by steel diagonal cross bracing composite sections, placed
between the central pairs of concrete columns of the laterals
and central transversal frame in such a way to realize, globally,
a seismic, ductile controlled, vertical wind bracing system (fig.5).
Regarding the lateral and gable walls, a suspended system is adopted
in order to: minimize foundation construction costs, increase
the stability properties of a high wall slender structure and
give an easy system for future lateral enlargement of the hangar.
The two 85 m long and 30 m high walls are directly suspended
from the heads of the main trusses following the same structural
geometry of twin profiles interconnected with a Vierendell
typical transversal connection.
The front door, 22,70 m high, involves the first long span trusses
to carry the track lines for the longitudinal retractable door
system. All the trusses supports an inner system of cranes, platforms
and catwalks addressed to the functionality of the hangar.
The final covering deck is done with trapezoidal corrugated galvanized
and prepainted steel sheets, additional insulating material and
a waterproofing metallic layer.
Veduta esterna dell'hangar
Fase di costruzione