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Integrated residential, retail and commercial space

Opus provided structural and civil engineering for Mirvac’s 49-storey residential and commercial development at Chatswood.

This $160m development contains 295 residential units, 4 levels of commercial space, ground level retail space, and 7 levels of basement car park. The basement covers the whole site between the street boundaries and the adjoining railway enclosure structure. There is also a swimming pool and gymnasium on the commercial levels.

Mirvac set stringent deflection requirements that exceeded the relevant Australian standards. When examined in combination with the desired maximum slab depth required for each floor, these criteria represented significant design challenges.

The other key challenge for the design team on this project was the break-up of the pouring of the floor slabs. During the construction phase, the client opted to break up the pouring of each floor slab into multiple pours in order to achieve maximum design efficiency.

The lean, efficient structural design for the project was achieved as a result of the detailed analysis and re-analysis of the design elements. Opus provided detailed design and finite element analysis including post-tension analysis. This ensured that the client’s challenging deflection parameters were adhered to early in the design process, enhancing our ability to meet the timelines.

The project was detailed in Revit which allowed the identification of conflicts between services at the early stages of design and created a more efficient, streamlined design process. 

Opus also performed the detailed post-tension design on the project – a function rarely undertaken by structural engineers on a project of this size. The Opus team was flexible enough to provide the further analysis necessary to also determine a structurally feasible break-up of the slab pours, even once the project was well into the construction phase.