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Condor Tower

Structural Engineering

Project Type / Category
Multi Residential
End Client
Condor Projects (Australia) Pty Ltd
Architect
Anthony Keene Design Partnership
Contractor
Q-Con
Project Value
$50M
Project Location
22 St Georges Terrace, Perth
Project Completion
June 2008
Value Engineering Solution
  • Retaining and reusing the existing 10 storey structure.
  • No demolition or landfill.
  • Partially piled raft (2nd ever in WA).
Unique Design Items
  • The primary tower was designed and detailed to be installed directly on the top of an existing 10 storey building.
  • This effectively piggy backed 17 storeys on top of the existing structure.
  • Engineering and stiffening of the existing structure and foundations for the new imposed loads was complex and challenging, involving unique engineering solutions and construction techniques.
Awards
  • WA Engineering Excellence Awards 2010 Overall Winner - Category “Innovation and Development & Infrastructure and Building"
  • Australian Engineering Excellence Awards 2010 - Sir William Hudson Award
  • Concrete Institute Awards 2009 - Finalist
  • UDIA Award for Excellence - Condor Tower 2009 Urban Renewal

Condor Tower, located at 22 St Georges Terrace in Perth Western Australia, was completed in 2008 and exemplifies Australian engineering innovation through adding 17 storeys on top of an existing 10 storey building. A vertical building extension of such magnitude was unknown in Australia and rare worldwide. It demonstrates via leading example, how obsolete structures with remaining design life and inherent strength can be economically adapted for reuse via restructuring. Standing approximately 100m tall, Condor Tower incorporates an under-croft carpark, two commercial floors and 24 residential floors.

Transformation of the Oakleigh Building to 2.5 times its original height required the application of rigorous engineering analysis and efficient design. Essential to the overall solution was the restructuring of the existing structure and strengthening of the original foundation system.  Support at foundation level was solved via designing a partially piled raft which, at the time, had been rarely used within Australia and to our knowledge, only once before in Western Australia.

During design it was identified that limited industry understanding existed of the load sharing behaviour between new and existing concrete building elements. This prompted four years of research to be undertaken in conjunction with the University of Western Australia (UWA). Results from the research will contribute to more efficient building designs in future restructuring applications and led to the presentation of numerous technical papers at nationally and international conferences.

In 2009, Condor Tower won the urban Development Institute of Australia award for ‘Best of the Best’ in Urban Renewal. This prestigious award recognised that the innovative and unique approach of recycling and reusing existing structures, as employed in Condor Tower, is considered best current practice in sustainable urban renewal in Australia.

In 2010 it was awarded two state engineering excellence awards and was overall winner. Subsequently, the project received top honours at the National Australian Engineering Excellence Awards receiving the Sir William Hudson Award which recognises the most outstanding engineering project (in Australia) and is the highest accolade that Engineers Australia confers. It represents the very best of the best with the winner celebrated and acknowledged not only in Australia, but around the world.

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