One of the innovations implemented by the project was developed by Aurecon to detect refrigerant leaks from the air-cooled chillers . The mechanism deploys weighing cells which are connected to the business management system to continuously monitor the weight of the chillers , enabling detection of even a minor leak of refrigerant . This limits the environmental damage caused by refrigerants with ozone depletion or global warming potential .
In addition , a facilities manager was actively involved during the design phase to ensure that the operational intent of the sustainability initiatives is effectively implemented after the commissioning of the building services . on this structural steel structure to compare anticipated movement with the theoretical design values .
The design required a 3m deep girder spanning 24.5m with large heavy H sections as members . The resulting weight and the pre-assembled , pre-camber , requirement created challenges in installing this member into place on site . A 180 ton crane was used to lift the 11 ton girder from Oxford Road reaching across the site by 55m to the final installation position .
As Rosebank becomes a sought after destination for P grade office developments , 144 Oxford has set the standard for others to follow .
STRUCTURAL CHALLENGES 144 Oxford provided unique structural challenges for engineers Sutherland :
Office Nose The two noses of the office tower comprise of columns on an unconventional grid a well as orientation , sloping at different angles as the frame unfolds upwards and outwards . The final frame resulting in a 13m cantilever from ground to roof . The complex concrete frame called for rigorous detailing of the slanted columns , splay columns and tie-back structural steel to brace the structure back to the reinforced concrete cores . In-depth structural frame analysis was required to understand the long-term movement due to the ‘ leaning ’ nature of this portion of the building as well as it being positioned above several transfer beams above the deep basement below .
Atrium Roof / Façade The atrium roof support structure spans between the two towers with tension rods supporting the hanging 9-storey glass curtain wall as well as the four hanging steel-framed meeting pods . The support girder had specific , carefully considered , camber requirements to ensure deflection into final position as the load from the construction sequence continued to be added . At each stage of sequential loading a survey was conducted
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