26 storey mixed-use building in ParramattaIn the heart of Parramatta's retail and business district, 10 Valentine provides the way for the new commercial 31 storeys commercial tower presenting a refined and precise marker to the Parramatta skyline. Comprising of 5 levels of the carpark, 26 levels of commercial, with off-form concrete framed structure and a new steel structure accommodating green walls.
Due to a narrow site and existing entry conditions, an eccentric lift and stair core are required to maintain maximum carpark spaces and commercial NLA. With the assistance of outriggers walls on the mid-plant room level, TTW engineered a unique and efficient design of the core, maintaining economical wall thicknesses.
As the building's lift and stair core are an eccentric core with transitioning columns from the carpark to the commercial levels, it required careful consideration of the lateral stability of the structure and the transfer of the large lateral loads back into the core. TTW overcame this design challenge by analysing the system carefully and ensuring that the load path maintains a simple and logical path. This simplified the frame design and foundation design. Collaboration with the architect was paramount to this design to minimise large lateral sways and stresses in the structural elements while maintaining a clear floor and ceiling space.
The space limitation on the boundary adjacent to the Sydney Trains rail corridor required further investigations. The Design Team has considered the use of pre-cast U column shells, as it negates the requirement of having to fully scaffold and form around the columns and gain space working within the boundary.