American Express Corporate Headquarters comprises four basement car parking levels, a ground floor transfer deck and eleven storeys of office space above ground floor. The building sits directly adjacent to the Western Distributor.

American Express is a part of the wider King Street Wharf precinct, with total project value in excess of $1.2 billion. Robert Bird Group was engaged by the client for structural and civil engineering for the life of the entire development.

Project Value:     
$63 million
Year Completed:
2007
Building Metrics:Total Area:

  • 16,500 m² approx
  • Levels: 11 + 4 basements

Environmental Performance:
4 Star Greenstar
4.5 Star AGBR
Sectors:
Commercial
Waterfront
Client:
Multiplex Developments

Primary Contractor:
Multiplex Developments
Architect:
Cox Crone
Robert Bird Group Services:
Structural Engineering
Civil Engineering
Construction Engineering

Key technical challenges

  • The primary tower structure consists of a composite slab and beam structure. Due to the long beam spans and thin slab, extensive analysis for footfall vibration was required to ensure the structure achieved code requirements and client expectations.
  • Working with the existing structure and developing design solutions that strengthened rather than demolished.
  • Extensive co-ordination with the mechanical engineer to develop a strategy that minimised beam penetrations and beam notches.
  • Differential shortening analysis with consideration of mega truss, steel structure, concrete structure and existing structural elements

Environmental performance

  • 5 Star Greenstar
  • 5 Star NABERs Energy and 4 Star NABERs Water ratings.

Robert Bird Group added significant value to the project, including the following innovations:

  • Existing basement structure was strengthened using structural steel to allow for late deletion of internal tower columns, thus providing large column-free office spaces.
  • Efficient long-span post-tensioned floor plate structures minimized floor heights
  • Precast load-bearing façade solutions allowed fast and safe construction directly adjacent to the Western Distributor.
  • Detailed co-ordination and notching of floor beams minimised building height whilst allowing for efficient services reticulation.

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