The Flying Mast

(insane in the membrane...)

So long Giant Marshmallow

The Iconic inflatable roof of the BC Place Stadium in Vancouver, Canada – aka the “giant marshmallow” – was finally deflated last may.

(Credit: John Bollwitt via Flickr)

(Credit: maplemusketeer via Flickr)

The existing pneumatic dome is to be dismantled and replaced with a partially fixed, partially retractable fabric roof as well as a transparent membrane façade.

When completed, this roof will be the largest cable-supported retractable roof in the world. The projected area of the retractable portion of the roof is approximately 6,700m², requiring a total of approximately 13,400m² of membrane material.

The project’s estimated budget is $458 million, and it is scheduled for completion by summer 2011.

The  new roof would cut energy costs at the stadium by one quarter, or about $350,000 per year.

A model of the new roof:

(Credit: Michael Kwan (Freelancer) via Flickr)

The project was designed by Stantec Architects Ltd, with structural engineering being provided by Geiger Engineers, New York, USA and Schlaich Bergermann & Partners, Stuttgart, Germany, supported by specialist consultants from Tensys.

The entire retractable roof and the fixed façade for the stadium is supplied by the Hightex GmbH in Germany – a world leader in the design and construction of retractable roof systems.

The fixed roof will be completed by FabriTec Structures, a brand of USA Shade & Fabric Structures – an award-winning full service
design/build organization specializing in tensile membrane structures.

From Hightex’s web site:

The contract will involve the fabrication and installation of the complete retractable portion of the membrane roof system in Tenara membrane, a woven, high translucency PTFE fabric, as well as the façade system to be fabricated from a transparent membrane with a light-controlling frit pattern. The design work will commence immediately, with completion planned to take place in mid 2011.

[…]

The new roof substructure consists of radial cable net and outer steel columns. The fabric roof is divided up into 36 fixed outer panels and 36 inner retractable segments. The outer fixed roof, to be the subject of a separate contract, has an area of about 34,000m². The inner roof will consist of a double layer Tenara membrane with an inflated inter-space to form “cushion” elements.

The cushions will be pre-stressed using hydraulic tensioning units and inflation via fan units. The retractable roof will be connected to the 36 radial cables by specially designed sliding and driving carriages. The deflated cushion will be stored at the centre of the roof in a membrane garage. To close the roof, the driving carriages will pull the membrane outwards radially towards the perimeter. The retractable roof is made of a highly translucent fabric which will allow the fabric to be folded without damage.

The new façade comprises some 6,000m² of transparent membrane panels using ETFE. The facade panels are pre-stressed using metal arches and are attached directly to the primary steel structure.

The deflation of the BC stadium – Time Lapse:

The deflation seen from the inside:

(Credit: miss604 via Flickr)

(Credit: miss604 via Flickr)

(Credit: miss604 via Flickr)

(Credit: miss604 via Flickr)

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October 20, 2010 - 4:00 PM Comments: Closed

The Greenpoint Stadium in Cape Town

(Credit: warrenski via Flickr)

Greenpoint Stadium is another stadium designed by the German firm GMP Architekten – in collaboration with the local firms Louis Karol Architects and Point Architects – for the 2010 FIFA World CUP in South Africa. structural engineering of the roof was done by Schlaich Bergermann und Partner.

The stadium is located in a 80 hectare public park in Cape Town on the shore of the Atlantic Ocean and at the foot of Signal Hill. The project with its clean and light design concept and undulating silhouette integrates tastefully in its surrounding landscape. Since the stadium could not be sunk into the ground due to the rocky subsoil of the site, an artificial elevated plateau was added in order to reduce the apparent height of the building.

(Credit: Steve Crane via Flickr)

The stadium is designed for both football and rugby games and has a capacity of approximately 68,000 seats. It will host one of the semi-finals matches of the World Cup. The angle of inclination of the seats guarantees the spectators an optimal view of the pitch from any point.

(Credit: Blyzz via Flickr)

The lobby is located at a height of 25 m and offers a view to the pitch as well as a panoramic view over the Green point Common park, the city and the ocean.

(Credit: Hadassah28 via Flickr)

The outer shell of the stadium is covered with a translucent light-colored fiberglass mesh that reacts and reflects the changing daylight conditions.

Detail of the fiberglass mesh used for the façade (Credit: warrenski via Flickr)

Detail of the fiberglass mesh used for the façade (Credit: warrenski via Flickr)

The saddle-shaped undulating roof structure is a combination of a suspended roof with radial truss systems. It is covered with 36,000 m2 of laminated safety glass and a translucent membrane skin on the interior that offers weather protection and sound insulation.

(Credit: warrenski via Flickr)

The 16m-wide inner ring consists of clear glass that allows natural light to come through, while the outer glass is enameled, reducing light intensity by about 80%.

(Credit: warrenski via Flickr)

The technical elements and lightings are installed in the space between the glass and membrane.

(Credit: warrenski via Flickr)

For more info on The Greenpoint Stadium in Cape Town see also:

designboom.com

fifa.com

Other related posts on this blog:

The Moses Mabhida Stadium

The World Cup stadiums in South Africa

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June 14, 2010 - 9:00 AM Comments: Closed

The Moses Mabhida Stadium

(Credit: David J. Roberts via Flickr)

The Moses Mabhida stadium – named after the former general secretary of the South African Communist Party – is one of the three stadiums designed by the German firm GMP Architekten for the 2010 FIFA World Cup.

This project group consisted of a total of 32 South African architectural firms plus GMP Architekten as consultant architects and Schlaich Bergermann und Partner as conceptual structural engineers.

(Credit: Sir. Mo via Flickr)

The Moses Mabhida Stadium is situated on an elevated platform in the central sports park on the shore of the Indian Ocean, and is accessed from the city and station via a broad flight of steps.

(Credit: Sir. Mo via Flickr)

The construction was finished in 2009 and some matches have been already held in this venue. The Moses Mabhida Stadium has a capacity to seat 70,000, and will host one of the FIFA 2010 World Cup semi-final matches. After the games, the number will be reduced to 56,000, but can be temporarily increased to as many as 85,000 for major events.

(Credit: David J. Roberts via Flickr)

The project features a 105m arch that rises high over the stadium, and is destined to become an architectural icon and city landmark in Durban’s skyline.

(Credit: Sir. Mo via Flickr)

The 350m long free-span steel arch weighs 2600 tons, and carries the weight of the inner membrane roof with 95mm-diameter steel cables.

(Credit: ¡Fgz! via Flickr)

(Credit: ChameleonGreen via Flickr)

The unusual geometry of the cable system is derived logically from the structure.

Radial prestressing cables are attached to the external edge of the roof all round the stadium and the great arch on one side and the inner edge of the roof on the other, thus forcing the latter into an almond shape.

The bifurcation of the huge arch at the south end forms the main entrance of the stadium. At the northern end, a cable car transports visitors to the ‘Skydeck’ at the apex of the arch to get a panoramic view of the city and the Indian Ocean.

(Credit: ChameleonGreen via Flickr)

The 46,000m2 PTFE-coated roof membrane admits 50% of the sunlight into the arena while also providing shade and shelter from rain to 80% of the stadium.

(Credit: Marc Forrest via Flickr)

By night the roof surfaces is illuminated on top by a line of LEDs mounted directly on the arch and from below by floodlights installed on the catwalk, resulting in a spectacular view.

(Credit: nozoomii via Flickr)

The compression ring and façade are carried on precast concrete columns below and hollow box steel columns above, the height and angle of inclination varying around the stadium from approx. 30m with a 90° inclination to about 50m with a 60° inclination.

(Credit: YattaCat via Flickr)

The façade is covered with perforated metal sheeting which give the stadium a light and airy feel. This solution provides shelter from rain and strong winds while allowing in natural light and ventilation.

For more info on The Moses Mabhida Stadium see also:

dezeen.com

designboom.com

archdaily.com

inhabitat.com

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June 12, 2010 - 9:30 AM Comments: Closed