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Sumit Singhal
Sumit Singhal
Sumit Singhal loves modern architecture. He comes from a family of builders who have built more than 20 projects in the last ten years near Delhi in India. He has recently started writing about the architectural projects that catch his imagination.

ATRIUM amras in Innsbruck, Austria by Zechner & Zechner ZT GmbH

 
November 22nd, 2013 by Sumit Singhal

Article source: Zechner & Zechner ZT GmbH

The brief was to plan an office building with low energy consumption on the periphery of Innsbruck. The site operates as a gate to the city, due to its proximity to the Innsbruck Ost transport hub.

Image Courtesy © Thilo Härdtlein, München

  • Architects: Zechner & Zechner ZT GmbH
  • Project: ATRIUM amras
  • Location: Innsbruck, Austria
  • Photography: Thilo Härdtlein, München
  • Client: ATRIUM amras GmbH, Hans Bodner BaugesmbH, Kufstein
  • Structural engineer: ZSZ Ingenieure, Innsbruck
  • Building equipment (HVAC, Electric): Ingenieurbüro Kainz PlanungsgesmbH., Innsbruck
  • Lighting design: Lichtdesign Gratzel, Innsbruck
  • Building physics: Spektrum, Dornbirn
  • Fire protection concept: IBS, Innsbruck
  • General contractor: Hans Bodner BaugesmbH, Kufstein

Image Courtesy © Thilo Härdtlein, München

  • Design: 20011 / 2012,
  • Construction: 2012/2013,
  • Completion 08/2013
  • Costs of construction: ca. € 10,5 Mio
Gross floor area:

  • Above ground: 6.900 m2,
  • Underground: 2.550 m2,
  • Total: 9.450 m2

Usable area:

  • Above ground: 5.900 m2,
  • Underground: 2.400 m2,
  • Total: 8.300 m2

Image Courtesy © Thilo Härdtlein, München

Compact Structure – an Atrium Flooded with Light

The building has an almost square ground plan, resulting from the layout of the development, and was designed as a type of atrium. The ground floor is raised by approximately 1m from the surrounding street level to avoid the underground parking coming into contact with groundwater.

Image Courtesy © Thilo Härdtlein, München

The entrance, which is connected to the neighbouring building that contains a furniture store, is also raised in this way to create a shared forecourt. The main entrance of the office building is therefore oriented towards this forecourt, and in addition the facade is rotated over two floors to mark the entrance and create a roof. Access to the pedestrian forecourt is via inclines, a wide staircase and a wheelchair ramp.

Image Courtesy © Thilo Härdtlein, München

Access to the interior is through the roofed inner area, which extends over multiple floors. Stairs that resemble bleachers lead from the entrance foyer on the ground floor up to the first floor, where a multipurpose area for small events and meetings is located.

Image Courtesy © Thilo Härdtlein, München

The word ‘atrium’ inspires the building’s name, and the atrium also provides important spaces within the structure to facilitate communication and interaction.

On the ground floor of the five-storey building there is commercial floorspace, including a pharmacy. Office space with flexible configurations is located above, as well as studios and doctors’ practices. Access to the units is via arcade-like corridors. The office spaces located around the atrium are organised to provide variable layouts of differently sized rental units.

Image Courtesy © Thilo Härdtlein, München

Alongside the interaction space of the atrium, a roof terrace provides another semiprivate meeting point for people employed within the building. The large terrace on the top floor also emphasises the views that the site provides of the surrounding mountains and Ambras Castle to the south.

Image Courtesy © Thilo Härdtlein, München

A Facade that is an Interplay of Contrasts

The facade is constructed from precast concrete components, each the height of an individual storey. These create a nonuniform grid composed of two differently sized window openings that alternate to form a varied pattern. The windows are a composite design with slim profiles and sun protection systems fitted in the middle for protection from the wind.

Image Courtesy © Thilo Härdtlein, München

The slight offset of the facade elements at each storey creates an interplay of light and dark, marks the edges of each level and makes it possible to read the floors. The contrast of light and dark is intensified by differences in the roughness of the surfaces. The rough and matt sandstone-colour concrete surfaces are contrasted with smooth reflective glass elements. The exterior shell of the building is such a distinctive part of the structure that it becomes a corporate identity and an icon for the project.

Image Courtesy © Thilo Härdtlein, München

The exterior walls are load bearing and are constructed from site-mixed concrete, to avoid the use of supports near the facade. The large parapets prevent fire spreading from floor to floor. Two cores reinforce the building frame, and house the staircases and shafts. The ceilings are unstressed reinforced concrete without joists. The upper ceiling is constructed using glued-laminated boards that function as box girders.

Image Courtesy © Thilo Härdtlein, München

Lean Technology – Low Energy

The optimum mix of transparent and closed exterior wall surfaces, high-quality exterior insulation and glazing provides waste heat recovery that gives the building an energy efficiency class of A+, with HWBref of 13.6 kWh/m2a.

The office windows are a composite design that has optimum building physics performance.

The structural properties allow a lean HVACR design.

Image Courtesy © Thilo Härdtlein, München

With the neighbouring project, ‘Leiner / Mpreis’, synergies were created, both in relation to the surrounding buildings and in shared transport systems. Alongside the jointly designed and used forecourt, shared entrances and exits to the underground parking reduce the space required for private vehicle access.

Image Courtesy © Thilo Härdtlein, München

Image Courtesy © Zechner & Zechner ZT GmbH

Image Courtesy © Zechner & Zechner ZT GmbH

Image Courtesy © Zechner & Zechner ZT GmbH

Image Courtesy © Zechner & Zechner ZT GmbH

Image Courtesy © Zechner & Zechner ZT GmbH

Image Courtesy © Zechner & Zechner ZT GmbH

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Category: Office Building

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