singapore engineer singapore engineer singapore engineer

NEWS
A 3D visualisation of moving roof, fixed roof cladding, scuppers, truss legs
and louvres.
define this - a sphere for the top and a torus for the bottom
surface - with the roof structure reducing from a maximum
depth of 5 m at the centre of the dome to 2.5 m at the base. This
optimised structural solution provided an architectural benefit
at ground level as the proportions of the structure reduced to
something more in keeping with the human scale.
Other shared objectives were set, such as simplifying the
detailing of all complex node intersections across the entire roof
and developing a standardised family of node details that could
be replicated wherever possible. This required an update to the
geometry of the roof, to achieve a more symmetrical design
than the competition-winning roof geometry. An additional
parallel truss was added, the main gutter trusses were realigned,
the geometry of the roof opening was adjusted and the diagonal
trusses were simplified.
The parametric model was used to control a multitude of
other relationships between elements, which would not have
been achieved, using conventional software. Each parameter
was treated in the same way - structural and architectural
requirements were considered, an optimised parameter agreed
on and inserted into the geometric control model for the roof.
And so, over a matter of months, a fully editable 3D model of
the stadium roof was completed, which defined every constraint
imposed on the roof and could be used independently by every
member of the team.
The architectural treatment of the stadium roof cladding has
been developed to clearly express the design and geometry
of the structure and at the same time meet the environmental
performance requirements to ensure spectator comfort within
the stadium.
For the moving roof, the desire was for a lightweight cladding
system that provided shade to the seating bowl and reduced
solar heat gain. At the same time, the moving roof has to appear
translucent and create a naturally lit event space during the day.
The multi-layer ETFE pillow met these design requirements and
at the same time provided the opportunity to illuminate the
moving roof at night.
The main areas of the roof dome are clad in a profiled
aluminum rain screen cladding system while the structure is
expressed using a recessed smooth panelised cladding system.
These recessed scupper areas are integrated into the night time
illumination of the roof with LED node lighting.
At the lower part of the roof, a giant louvre zone provides a
naturally ventilated sun- and rain- protected zone outside of
Internal rendering of stadium bowl.
October 2012 THE SINGAPORE ENGINEER
45