The structure consists of a supporting
structure for a chimney, with a strong corporative image. The
steel structure can be divided in three parts, for ease of description.
In the first part a framed structure with constant spans is presented.
This substructure is supported by a slender one, which has the
function of guaranteeing the vertical support to the chimney and
to the leaf (Part 3).
PART 1 - Regular frame structure supported on top of the existing
building (concrete structure). This structure has four levels.
The first level is at a height of 127.0m (note that the ground
level is at a notional height of 100m above the see level). The
spans have a total length of 7m and are braced horizontally and
diagonally in the middle span. Above this platform a three level
tower was built with a total height of 9 meters. The spans are
3.5m long. The last platform of this structure is at a level of
136 meters. The beam elements are made of steel profiles IPE400
and HEB400 for the columns.
PART 2 - In this part of the structure horizontal and vertical
supports were installed to accommodate horizontal displacements
of the chimney due to temperature variations, and therefore this
substructure involves the chimney
In order to resist the horizontal forces, eighteen cables, in
groups of 3 cables, were placed on two opposite sides of the structure.
The cables were connected to the structure through a ring. The
main aim of this ring was to make all the cables converge to the
same point (torsional centre of the structure). The columns are
made of profiles CHS 273.0x10.0 and all the horizontal curved
elements are made of profiles CHS 168.3x10. The steel cables have
PART 3 - In the structure of the leaf the outside line was defined
with steel profiles CHS 355.6x12.5 and in the inner part CHS 168.3x10.0
profiles were used to form the veins. Due to the size of the profiles
it was very difficult to camber the curved elements, therefore
cut and join using templates was adopted.