Construction—APAC—Australia—Commercial Buildings
Light and stable Structures: DYWIDAG Post-Tensioning Tendons
for Tower Two at Collins Square in Melbourne
Currently, one of the largest commercial construction projects in Australia is under construction at the centrally located
Collins Square in Melbourne’s Western Precinct. It involves the construction of a large block of buildings that includes
6 towers and a renovated, historical warehouse that will accommodate offices, retail facilities and restaurants on an area
of over 250,000m².
DYWIDAG Strand and Bar Post-Tensioning
Systems were used in levels 26 and 27 of
the 39 story high Tower Two at 727 Collins
Street. The contractor, Form 700, together
with its partner company Postenco, designed
an alternative solution for the complicated
structural design of both levels. In order to
comply with the design of the architects,
no columns could be used in the façade
of level 26 on one side of the building.
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As there are 12 more stories above level 27,
not having these columns in the façade
created structural instability that was initially
solved with passive reinforcement.
As an efficient and light-weight alternative,
Postenco proposed active post-tensioning
using eight 57mm Ø DYWIDAG Bar Tendons
and DYWIDAG Strand Tendons with
Type 6837 MA Anchorages.
The large steel “triangles” on level 26
were tensioned back to the central core
of the building using DYWIDAG Bar and
Strand Post-Tensioning Tendons.
In total, 8 Fep 1,050N/mm 2 DYWIDAG Bar
Tendons with nuts, couplers and plates
were cast into the floor and the walls of the
core. The DYWIDAG Strand Tendons were
installed in the heavy beams on level 27,
tying back the steel triangles of level 26.