Specialty Fabrics Review June 2020 - 44

FOCUS

MARKETS

on levels from 185 to 200 meters (607 to 656
feet), with magnificent views of Rottweil.
"Customers can access the lifts via a
naturally lit, two-story lobby" at the base,
Jahn says. "The glazed shafts show all the
elevators, and a lightweight, glass staircase
leads to the double-decker and twin elevators"
on view and in use by visitors.

The exterior wrap of the tower contributes
to the overall structural performance and
improves the durability of the concrete
portion of the tower. The long-lasting
PTFE-coated glass fiber fabric increases
in transparancy as it ascends the tower.

"The ThyssenKrupp tower is used to test
and certify high-speed elevators," Sobek
says, "and contributes considerably toward
reducing the development time of future
skyscrapers throughout the world."
With 12 elevator shafts, offices and meeting
rooms within, and at the highest level, an
observation deck for visitors (including
exhibition space and a cafe), the tower is
more than just a research and development
building. It has multiple entrances located at
different elevations at the base of the tower
to accommodate different groups of people.
"The building entrance is integrated into
the landscape by means of berms," Jahn says.
"A ring-shaped bypass opens up four different
entrances that allow customers, employees,
visitors and delivery traffic to be separated.
Parking spaces for cars, buses and trucks are
located parallel with the bypass."
In sequence, starting from the top: at 246
meters (807 feet) high, the tower is the tallest
structure in the valley, and one of the tallest
in Germany. Visitors get 360-degree views
of the Alps and immediate area at the 232meter (761-foot) mark, the highest visitor
platform anywhere in Germany. Areas for
presentations and company offices are located

CONCRETE + FABRIC IN HARMONY
The structure of the test tower is made of a
thin reinforced concrete tube with a diameter
of 20.8 meters (68 feet), with the walls of the
elevator shafts inside the tube only marginally
transferring horizontal loads throughout the
height of the tower. This means that it is a
highly efficient structure with an average
exterior wall thickness of only 25cm (9.8
inches). Wind loads on the concrete shell
add minimal deformations at the top of the
tower of only 331mm (13 inches) resulting
in a ratio of 1/725, a value comparable to the
usual ratios in most high-rise construction.
The exterior fabric wrap contributes to the
overall structural performance and improves
the durability of the concrete portion of the
tower. "The envelope consists of an extremely
long-lasting PTFE-coated glass fiber fabric
that increases in transparency as it ascends
the tower," according to a report from Sobek's
office. Approximately 16,000 square meters
(172,200 square feet) of the fabric membrane
is installed in a helical pattern in six long
strands of fabric-each strand 12 meters (39
feet) wide-weaving their way up the tower
about 2.5 meters (8 feet) away from the
concrete tube surface. Moving up the tower,
the mesh fabric begins at the base with 15
percent openness; at about a quarter way up,
18 percent openness; at the halfway point, 22
percent openness; to arrive at the top quarter
of the total height with 27 percent openness,
bringing in more light and expanding the
views from the elevators as they rise to the
observation deck level.
"The fabric is secured to six steel pipes
that spiral around and encircle the shaft of
the tower," Sobek says. "The prestressing
required for the fabric creates spatially curved
surfaces between the pipe ribs ... which has
an extremely positive effect on the vibration
behavior of the tower, and in particular
dampens the effects of oscillations."

44 REVIEW JUNE 2020

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Specialty Fabrics Review June 2020

Table of Contents for the Digital Edition of Specialty Fabrics Review June 2020

Specialty Fabrics Review June 2020 - Cover1
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