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Concrete In Australia : June 2013
24 Concrete in Australia Vol 39 No 2 FEATURE: BRIDGES EastLink Bridge: The signature structure of Peninsula Link Opened in January 2013, Peninsula Link in Victoria is a new 27km freeway between the EastLink motorway at Carrum Downs and the Mornington Peninsula Freeway at Mount Martha. It is the Mornington Peninsula s biggest infrastructure project to date. Peninsula Link was delivered under an availability public private partnership by the Southern Way consortium, which included a design and construct partnership between Abigroup and the Sinclair Knight Merz (SKM)/Aurecon design joint venture. e EastLink Bridge is the signature structure of Peninsula Link and the entry point to the new freeway as part of a major interchange. With an overall length of 320m, the EastLink Bridge is the longest of the project s 31 bridge structures. e single-deck bridge carries two 12m-wide carriageways separated by a central barrier, and comprises nine simply supported spans with lengths varying from 30m to 39m. e bridge superstructure consists of prestressed Super-Tee girders with an insitu overlay, while the substructure consists of both passively and post-tensioned reinforced concrete crossheads supported by twin reinforced concrete columns, which in turn are supported by precast driven piles. In total the bridge used approximately 6000m3 of concrete in its construction. In accordance with Australian standard AS5100 Bridge Design, the structure was designed and detailed to achieve a 100 year design life. Materials were chosen to support this requirement with minimal ongoing maintenance. e entire bridge was designed for SM 1600 traffic loads as per AS 5100. Piers close to the banks of the local creek were designed to resist the 1-in-2000-year average recurrence interval flood. As a critical piece of infrastructure in the road network, and as required by AS5100, the bridge was also designed to safely withstand the effects of potential earthquakes, following a detailed assessment of earthquake loading considering local geological features. Mark Percival, SKM design director for the Peninsula Link design joint venture, said: "Efficiency and repeatability were guiding principles for the bridge design, in terms of optimising the use of precast concrete elements and other materials, minimising the bridge footprint, maximising the use of repetitive items used, and minimising the number of expansion joints, resulting in very efficient time management." e original concept design of the dual carriageway bridge was for two bridges, one for each carriageway. e final design brought this back to one bridge, minimising the project footprint and optimising the use of materials. A cast-insitu deck slab was overlaid on precast Super-Tee girders to create a composite structure. Achieving composite behaviour enabled an efficient and effective structural design using slender Super-Tee girders, which led to savings for the contractor. e road grade line could also be lowered, leading to further savings in embankment construction. In addition, the lifting weights for the Super-Tee girders were reduced, shortening construction time, and increasing construction safety. Elements of the bridge in different areas were custom designed so that thicknesses and amounts of concrete could be tailored to suit the load and conditions. For example, the girders in longer spans were 1800mm deep, while on shorter spans they were 1500mm deep. As a result of making the insitu concrete deck continuous over all the piers (apart from the central pier), only three expansion joints were required. Minimising the number of expansion joints not only provides a smoother driving experience for motorists, but also reduces the time and cost for future maintenance works. Piers are geometrically similar, with each consisting of a single cast-insitu, prestressed or passively reinforced pier crosshead supported by twin columns. Columns are supported by a pile cap and a series of 350mm square precast driven piles. is uniform pier arrangement increased construction efficiency and saved time due to repetition of the same construction procedure. e alignment for all the bridge piers was set to match that Construction progress while waiting for consolidation of abutment earthworks. Feature lighting over the south-bound Mornington Peninsula Freeway ramp.