Council on Tall Buildings and Urban Habitat
CTBUH Australia Hosts Urban Regeneration Seminar
In Brisbane
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March 12, 2015
BRISBANE – CTBUH Australia’s Brisbane Committee held the first of its Urban Regeneration Breakfast Seminars on March 12, 2015. More than 100 people attended the presentation on One Central Park, which was recently awarded the title of Best Tall Building Worldwide 2014. The award, presented by the Council on Tall Buildings and Urban Habitat, was chosen after a year-long selection process across 88 entries in four regions.

CTBUH Australia Chairman John Flynn gave a summary of current events in the tall building world and introduced the three speakers:
  • Mark Giles, Senior Associate, PTW Architects, Collaborating Architects;
  • Matt Harding, Principal, Robert Bird Group, Structural Engineers; and
  • Robert Saidman, Principal, Arup, Building Services Engineers.
One Central Park, Sydney, Australia
Mark Giles discussed the relationship with PTW Architects and the design architect, Ateliers Jean Nouvel, as well as the collaborative relationship that existed amongst the whole design team to deliver the project.

He described the project as consisting of two towers: the 34-story, 134-meter east tower and the 18-story west tower, situated over a common five-level commercial podium and five-level car park. The two towers contain 623 apartments, predominantly studio, one- and two-bedrooms, with a small number of three-bedrooms on upper levels. Over 16,000 square meters of retail space is available with a total gross floor area of 68,626 square meters and parking for 1,200 cars (not all allocated to One Central Park).
One Central Park has been developed by Frasers Property Australia and Sekisui House Australia in a joint venture, and is situated on a 5.8-hectare development site known as "Central Park." The site was originally developed in 1835 and has long been the site of a brewery. Over 30 heritage items are still located on the site and have been incorporated into the development. Mark discussed the location of the project in the context of the Sydney central business district (CBD) and showed how the city center is slowly tracking south toward the development. The development clearly marks the gateway to Sydney’s downtown area.
(Left) John Flynn, Australia Chairman, CTBUH &
(Right) Mark Giles, Senior Associate, PTW
Giles went on to describe the north, east, and west façades of the two towers, which presents linear planters and green walls (designed by Patrick Blanc) to the CBD and surrounding streets, forming straight and clean faces. The south façade however, presents a softer, quieter face to the southern elevation of the towers, the adjacent Chippendale residential development, and the parklands inside the development.

The west tower has heliostats incorporated on the roof that reflects sunlight to the underside of the large cantilever deck on the taller east tower. This deck has a reflector frame mounted below it. The heliostats track the sun with two-meter by two-meter polished aluminium mirrors, which reflect sunlight to the reflector frame and provide daylight to the pool terrace on the podium between the two buildings, and into the adjacent dining space and public parkland.
Matt Harding from Robert Bird went on to explain the structural engineering challenges to construct the 45-meter-long cantilever and how the steel frame and reflector frame were constructed. The trusses were built incrementally at the 29th floor. They sit on four columns at the front and are held down with four columns at the rear. The trusses were constructed segmentally as additional dead load was added by floor levels constructed above to hold the trusses in position. The trusses weigh 700 tonnes and provided space for a sky garden terrace as well as hold the reflector frame in place. The reflector frame was designed to be slid onto the trusses to avoid having to bolt it in place at a high level before it was stable. Matt also gave a description of the wind tunnel testing carried out to determine appropriate wind loads on this unusual structure. A building maintenance unit (BMU) unit was also slung under the cantilever trusses to maintain the green walls on the west façade.
Heliostats cantilevered off the west tower
The project also incorporated 2.7 linear kilometers of planter boxes which were integrated into the façade. The planter boxes were constructed with moulded plastic with all irrigation fabricated with the boxes. This arrangement, developed between the design team and fabricator, saved two kilonewtons per square meters of dead load on every floor level.

Robert Saidman from Arup went on to discuss the tri-generation and water recycling systems incorporated into the Central Park precinct, which were designed by WSP. The Central Thermal Plant (CTP) incorporates a 2.2MWe tri-generation system that produces 13MWt of hot water generation and 21MWt of chilled water generation, as well as thermal storage. Every apartment is individually metered so occupants can monitor their consumption rates in real time. This system has been calculated to produce a 190,000 tonne reduction in greenhouse gases (over the 25 year design life of the plant).
Matt Harding, Principal, Robert Bird Group Robert Saidman, Principal, Arup
Robert went on to describe the one-megaliter water recycling system, which produces all the water needed for the site and actually exports clean water. The system also incorporates blackwater mining by extracting from an adjacent sewer and treats and recycles the water. Robert also described how the green walls filter pollutants, provides insulation, provides protection from UV radiation, and reduces peak energy loads by 20 to 40 percent depending on the apartment location.

Mark Giles returned to the stage to further discuss the green walls, which incorporate 383 species of plant and over 30,000 square meters of horizontal and vertical green space. The parkland on the development covers 38 percent of the site area to provide a restful haven for occupants. The green wall system is irrigated using the recycled water and incorporates a trickle dose nutrient boost at the top of the building. Mark revealed that the overall development cost was around $AUD4,600 per square meter.

A vote of thanks was delivered by Scott Chapple of dwp|suters, the event sponsors.
Vidoes of the talks are available online here:

Speaker 1: Mark Giles, PTW Architects

Speaker 2: Matt Harding, Robert Bird Group

Speaker 3: Robert Saidman, Arup

Speaker 4: Mark Giles, PTW Architects

Question and Answer Session
Scott Cahill AECOM
Rob Dagnall AECOM
Tom Dawes AECOM
Richard Fairhead AECOM
Derek Forbes AECOM
Steve Morrisby AECOM
Paul Foreshaw All Harrows School
Mark Burrowes Architectus
Allan Reilly Architectus
Paul Chang Arkhefield
Frank Ehrenberg Arkhefield
Wesley Shaw Arkhefield
Andy Bradley Arup
Alistair Hall Arup
David Mills Arup
Sandra Nilsen Arup
Robert Saidman Arup
Dylan Smith Arup
Graeme McKenzie Aurecon
Chris Adkins Australand
George Peterson Aveo
Mal Graham BG&E
Tony Avis Bornhorst + Ward
Rocky Guruprasad Bornhorst + Ward
Brett Taylor Bornhorst + Ward
David Teakle Bornhorst + Ward
Andrew Wilson Bornhorst + Ward
Rob McDonald Brookfield Multiplex
Michelle Fitzgerald CBUS
Gavin Grahame CBUS
Karlo Zeckovic CNN Architects
Claire Bazeley Conrad Gargett
Andrew Campbell Conrad Gargett
Jarrod Darham Conrad Gargett
Paul Emmett Conrad Gargett
John Flynn Conrad Gargett
Kylie Gow Conrad Gargett
Katharina Nieberler-Walker Conrad Gargett
Megan Randerson Conrad Gargett
Phoebe Thompson Conrad Gargett
Louisa Watts Conrad Gargett
Bruce Wolf Conrad Gargett
Kristy Zhang Conrad Gargett
Ross Daley Cottee Parker
Martin Timms Cottee Parker
Mark Clements Crone Architects
Nick Grbavac Crone Partners
Lachlan Walker DC8 Studio
Colin Robertson Destravis
David Toohey Devcorp
Terry Conway Devine
Leigh McQuade DMA Partners
Paul Anthony dwp|suters
Doug Burley dwp|suters
Scott Chapple dwp|suters
Michelle Duval dwp|suters
Geoff Street dwp|suters
Fay Weng dwp|suters
Andy King Gleeds
Matt Leyshon Grocon
Alison Sayce GWA Bathrooms & Kitchens
Mark Roehrs Hassell
Kylie Rowlands Hendry Group Pty Ltd
Carmel Atkinson Hyder
Glenn Barton Hyder
Peter Cauchois Hyder
Kristy-Lee Cristea Hyder
Dave Hargraves Hyder
Michael Bruderlin ISPT
Rod Walker ISPT
Karren Ognibene KO & CO Architecture
Dan Caldwell McKenzie Group
Stuart Cavin Napier & Blakeley
Greg Theodoridis Nettleton Tribe
Frank Bakker Norman Disney & Young
Sean Bell Norman Disney & Young
Jeff Marchent Norman Disney & Young
Johnathan McCowen Norman Disney & Young
Peter Czyszek Opus
Leigh Glover Opus
Mark Kreutz Opus
David Norris Opus
Bruce Street Opus
Danielle Tuite Opus
Brian Wooldridge Opus
Mark Giles PTW Architects
Peter Anderson Property Solutions
Paul Megram Rider Levett Bucknall
Robert West RJW Consulting
Brian Timothy- Parks RLB
Matt Harding Robert Bird Group
Damon Kambouris Robert Bird Group
Phil Latham Robert Bird Group
Grant Weir Robert Bird Group
Scott Wheeler Robert Bird Group
Duncan Betts Rothelowman
Jeff Brown Rothelowman
Dean Miller Savilis
Mike Hobbs Stockland
Matthew Watt Studio Arkitecture
Evan Atkinson The Buchan Group
Chris Bowerbank The Buchan Group
Jackson Chan The Buchan Group
Magdalena Kowalczyk The Buchan Group
Anne Rigby The Buchan Group
Jim Lane Turner Townsend
Stewert Hobbs UQ
Geoff Gibbons Urban Strategies
Ben Slack Urbis
Cameron Stanley Urbis
Matt Berndt Videographer
Lincon Ford WTP
Aden Shirt WTP
Jared Chow Zenx Architects