405 Bourke Street is a new commercial development located in the heart of the Melbourne CBD. Designed by renowned architect Woods Bagot, the project is set to feature a 40 storey, 180 metre building combining office and retail spaces.
The tower is to be built in and around the constraints of the site. Existing car park structure, light easements, 399 Bourke Street building and the existing east retail and car park areas all provided constraints to the design as well as the constructability of the proposed tower.
The north-east portion of the tower cantilevers over the existing 399 Bourke Street via the use of three mega trusses. Each mega truss, approximately 28m long x 12m deep, consists of 2mx2m steel cross sections filled with concrete which form a distinctive feature of the building.
Extensive works and re-planning within the existing 399 Bourke retail zone were required with the design team to ensure the structural integrity of the existing structure was maintained and the client’s expectations realised.
Expected completion 2021
Total Area: 61,500
Brookfield Foundry Landowner Pty Ltd
Robert Bird Group Services:
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
- 5 Star Greenstar
- 5 Star NABERs Energy and 4 Star NABERs Water ratings.