Exceptional Architecture with High Strength Threaded Reinforcement Bars
At a height of 319m, the Australia 108 project is the country´s second tallest skyscraper with regards to its total height.
DYWIDAG-Systems International Pty. Ltd., Australia was asked to support on the reinforcement of the building located in Melbourne’s Southbank District.
The Australia 108 includes 1,105 apartments on 100 floors, the upper part of the building features a starburst that symbolizes the Commonwealth Star on the Australian flag. It cantilevers 6m out from the building façade at a height of 210m and includes a sky garden and two swimming pools. In addition, at levels 40-47 and 65-68, extremely high loads and forces acted on the supporting structure that would have resulted in reinforcement congestion.
DYWIDAG-Systems International has an extensive record of examples, approvals and applications across the globe where GEWI® Plus 670-800 Threaded Reinforcement Steel Bars have been used to optimize structures, increase building speed and save time and money.
As an optimum solution, DYWIDAG-Systems International Pty. Ltd. suggested reinforcement consisting of high tensile GEWI®Plus Threaded Reinforcement Steel Bars in larger diameters to reduce congestion.
For the Australia 108, the GEWI® Plus System including couplers was used in order to optimize the cross sections of the columns and wing walls at levels 40-47 and 65-68. The tendons were specially cut to length for this project.
In total, DYWIDAG-Systems International Pty. Ltd., Australia supplied 260t of high strength reinforcement, grade 670/800 N/mm2, 50, 57, 63,5 and 75mm Ø GEWI® Plus Bars. The tendons are both in accordance with local ACRS Approval T1002 and the Australian reinforcement norm AS/NZ 4671.
Furthermore, 63.5mm Ø GEWI® Plus Threaded Reinforcement Bars with a double 11 degree bend and specially designed cranked couplers were installed. In addition, 20t of high tensile 75mm Ø, grade 835-1030N/mm2 post-tensioning bars according to ACRS approval T1003 and AS/NZ 4672, the norm for post-tensioning bar and strand, were used in this project.
The designer was very satisfied with the help from DYWIDAG-Systems International in adapting the design methods to fit within Eurocode and check against Australian standards. The feedback of the builder and its subcontractors was very positive, as the threadbar system proved to be easy to use on the building site, including the coupling of the bars. It prevented a redesign of concrete cross-sections, and the bar systems made the construction of the building possible and reduced building delays that would otherwise have occurred.