111 Eagle Street, Brisbane

By Lynne Blundell

19 October 2011 – GPT’s 111 Eagle Street building in Brisbane was given an innovative façade treatment for its glass lift shaft to overcome issues of heat ¬– the first time the method has been used for lifts.

Scheduled for completion in 2012, the Eagle Street project, developed by GPT, has received a six Star Green Star design rating and is aiming for six star Green Star As-Built and five Star NABERS Energy ratings. It was designed by Cox Raynor architects and engineering firm Arup and constructed by Leighton Contractors.

The building features an organic structural frame and a high-performance fully glazed façade, maximising the Brisbane River views. Another key feature is the building’s flexible floor plates.

To further optimise the river views and work space the building was designed with 200 metre glass-faced lift shaft.

Although visually dramatic, the glass lift shaft presented some problems of excess heat, both due to the movement of the lift car and the impact of the afternoon sun from the western façade. The Floth Physics Team, which provided the airconditioning for the building, was engaged by Leighton Contractors to develop a solution to ventilate and condition the lift shaft to combat the excess heat.

Floth research and development manager Guillaume Jolly said finding a cost effective solution to ventilate the lift shaft in a way that was going to meet the project environmental standards was the biggest challenge the team faced throughout the project.

“We have used a facade modeling strategy that we have developed over the past three years with the help of the Lawrence Berkeley National Laboratory in California,” Jolly said.

“This is the first time in the world such a lift shaft has been uniquely integrated into the external façade.”

The Floth team used 3D modelling environments, dynamic thermal simulation and computational fluid dynamics to come up with solutions for the Eagle Street development.

Floth has provided engineering and sustainability services on a number of high profile projects including Green Square, HQ, 400 George Street and King George Central in Brisbane.

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