Tūranga

Structural Designer

Lewis Bradford Consulting Engineers

Client Name

Christchurch City Council (Southbase Construction)

Location

Christchurch, New Zealand

PRINCIPAL CONTRACTOR
Southbase Construction

ARCHITECT
Architectus and Schmidt Hammer Lassen

KEY CONTRACTORS
Christchurch City Council - ​Building owner/ developer
Ruamoko Solutions - ​Structural peer reviewer
Prof. Stefano Pampanin - Specialist peer reviewer of hybrid walls
Prof. Brendon Bradley - Site specific seismic hazard analysis
Dr. Geoffrey Rodgers - HF2V damper design
Tonkin + Taylor - ​Geotechnical engineer Images: © Adam Mork (1)

PROJECT DESCRIPTION

A new central library built following the devastating 2010-2011 earthquakes in Christchurch. Tūranga was constructed to very stringent seismic performance criteria and features state-of-art seismic resisting systems. 

Judge's comment:

The concept for this five-storey, 10,000m2 library was inspired by the 2010-2011 earthquakes that affected Christchurch, New Zealand, where the majority of buildings remained safe, but a great number were uneconomic to repair and required demolition.

Tūranga’s hidden beauty lies in its level of seismic resilience, such that after a serious seismic event, the shock absorbing systems could be readily replaced and the building would be re-usable.

The massive concrete core walls, some weighing around 140 tonnes, were cast flat on site and then “tilted up”. They provide stability to the building and in a seismic event are able to “rock” due to their connection to the foundations and to adjacent components being made with replaceable shock-absorbing devices. They work in conjunction with a perimeter steel moment resisting frame which also has rocking base connections.

The engineers were instrumental in encouraging plant, that would have been positioned in a basement, to be placed on the roof, allowing the proposed basement to be removed from the scheme. This enables the building to be constructed off a shallow gravel layer, avoiding both the expensive basement and costly piled foundations.

A great example of how structural engineers can make such a crucial difference to a building, this is in every sense - a building that rocks!

Contact us

Telephone: +44 (0)20 7235 4535
Email: [email protected]

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