Glass obelisk with sustainable building technology and cultural reference

 Allianz Tower, Istanbul
Photo source
Schüco International KG
The 185.5 m Allianz Tower in Istanbul is the first LEED Platinum-certified skyscraper in Turkey.

The glass building envelope, which represents an essential component of a complex holistic climate concept, was based on the Schüco UCC 65 SG unitised façade for technical, economic and aesthetic reasons.

The 40-storey “Allianz Tower” office building is located in the Asian part of the metropolis of Istanbul, which is separated from the European side with the old town by the Bosphorus. Consequently, the New York architects FXFOWLE sought a cultural reference in the Ottoman geometric motifs of building.

The Allianz Tower in Istanbul: a 185.5 m, 40 storey office building featuring the latest building technology which was the first building in Turkey to receive the LEED Platinum certificate. The texture and ornamentation in the façade make reference to the architectural language of the Orient.
The Allianz Tower in Istanbul: a 185.5 m, 40 storey office building featuring the latest building technology which was the first building in Turkey to receive the LEED Platinum certificate. The texture and ornamentation in the façade make reference to the architectural language of the Orient.
Picture credits: Schüco International KG

At the same time, the concept strives for a modern synthesis of culture and climate. The sculptural, angular form of the building alludes to Cappadocia rock formations of the  “Fairy Chimneys” in Anatolia, while a number of integrated gardens and the large “sky garden” at the top of the building anchor it in nature and the landscape.

Brilliant gold in colour and visible for miles around, the solar shading panels, which are arranged asymmetrically and in different densities across the building depending on the cardinal direction, are a design feature with a reference to regional building culture.

The combination of vertical and sloping façade surfaces characterises the sharp design of the obelisk-shaped office tower (Custom unitised façade based on Schüco Façade UCC 65 SG).
The combination of vertical and sloping façade surfaces characterises the sharp design of the obelisk-shaped office tower (Custom unitised façade based on Schüco Façade UCC 65 SG).
Picture credits: Schüco International KG

Differentiated sustainability assessment in accordance with LEED

The design for the Allianz Tower aspired to the highest LEED certification - Platinum - and took its bearings from the requirements of this differentiated and globally recognised rating system for green buildings in all relevant aspects.

Energy and water efficiency, the quality of the space and location, the use of sustainable materials from the region and numerous other assessment criteria were individually taken into account and ultimately led to an excellent overall evaluation for a high-rise building with 81 points out of a possible 110.

Fixed solar shading panels with brilliant gold, translucent surfaces provide a contrast to the reflective solar shading glazing. The number and arrangement of the shading surfaces depend on requirements and the orientation of the respective façade area.
Fixed solar shading panels with brilliant gold, translucent surfaces provide a contrast to the reflective solar shading glazing. The number and arrangement of the shading surfaces depend on requirements and the orientation of the respective façade area.
Picture credits: Schüco International KG

Project-specific individualised system façade

Technical, visual and economic requirements came together in the design for the rear-ventilated glass curtain wall. The option chosen was the  custom unitised façade based on  Schüco Façade UCC 65 SG - a powerful, flexible modular system for unitised façades.

In view of wind loads, weathertightness, security and other technical requirements, the means to move in a system environment which only contains components that have been tested by renowned test institutes proved to be a major advantage for the Allianz Tower over alternative special constructions.

Apart from the relatively ordinary parts of the façade, customised solutions are realised which will also ease the installion, as well.

Fixed solar shading panels with brilliant gold, translucent surfaces provide a contrast to the reflective solar shading glazing. The number and arrangement of the shading surfaces depend on requirements and the orientation of the respective façade area.
Fixed solar shading panels with brilliant gold, translucent surfaces provide a contrast to the reflective solar shading glazing. The number and arrangement of the shading surfaces depend on requirements and the orientation of the respective façade area.
Picture credits: Schüco International KG

For instance, at junction of the various inclined surfaces, special CNC milling pieces are used to combine the parts with a perfect tightness.

As further example, considering water drainage, special glazing gaskets are used where the inward inclination is more than 16 degrees.

Special solutions were also used for the double-skin safety glass compositions, which incorporate a low-e coating and a ceramic grid of dots in the glass composition due to the increased solar shading and the thermal insulation.

The Schüco custom unitised façade impressed the clients and architects from a visual and economic perspective too. A key aesthetic aspect was the flush-fitted external appearance of an all-glass façade in combination with narrow profile face  widths of only 110 mm in the interior. Furthermore, the unitised construction ensured efficient fabrication and installation and

guarantees the easy replacement of individual glazing units if maintenance is required.

The crest of the Allianz Tower comprises a large roof garden (here during the installation phase). Along with other sky gardens in exposed positions, it is integrated in the green climate concept of the building.
Picture credits: Schüco International KG
Picture credits: Schüco International KG  The crest of the Allianz Tower comprises a large roof garden (here during the installation phase). Along with other sky gardens in exposed positions, it is integrated in the green climate concept of the building.
The crest of the Allianz Tower comprises a large roof garden (here during the installation phase). Along with other sky gardens in exposed positions, it is integrated in the green climate concept of the building.
Picture credits: Schüco International KG

 

Project details

Project title: Allianz Tower, Istanbul (TR)

Client: Renaissance Development (USA)

Architect: FXFOWLE, New York (USA)

Façade consultant: Axis Facades, USA & Turkey
Fabricator: Aygün Alüminyum Sanayi ve Tic. A.Ş., Istanbul (TR)

Completion: 2016

 

Schüco products

Curtain walling for the tower: Custom unitised façade based on Schüco Façade UCC 65 SG

600450 Glass obelisk with sustainable building technology and cultural reference glassonweb.com

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