BG&E developed a structural model of the bridge using Midas bridge analysis software and included the complex construction stages that were required to build the bridge over the live QR railway corridor.

The proof engineering process for this complex bridge involved a high level of collaboration between the designers and the construction CBGU JV to understand the construction staging as this had a direct impact on the design of the bridge. BG&E was able to engage with the design team and the CBGU JV to successfully close out all design comments on the bridge design.

The Yamma Bridge is slated to become a landmark for Brisbane’s inner south – stretching 480 metres over passenger and freight rail lines to connect the Boggo Road health and science precinct, the Princess Alexandra (PA) Hospital precinct, a new high school, and the University of Queensland (UQ). This bridge is being delivered as part of the Cross River Rail Project in SE QLD.

BG&E was engaged by the CBGU JV to be the Proof Engineer for all structural designs associated with the Cross River Rail project which included a new cable stay pedestrian bridge and approach ramps.

The new bridge spans the Queensland Rail (QR) corridor and includes lifts on both sides, dedicated cycle and pedestrian paths, seating, shade and rest stops and is designed to meet disability access requirements.

The 480 metre long bridge is divided into a western approach, cable stayed bridge, and an eastern approach. The western and eastern approach ramps span up to 38 metres long and are 4.65 metres wide and the cable stayed section over the QR corridor consists of two spans (35.6 metres and 73.9 metres) and is 6.25 metres wide.

The bridge deck for the approaches and main cable stayed spans comprised of a steel box section with a cast in-situ reinforced concrete composite deck slab. The approach spans are supported on reinforced concrete piers consisting of a single pile and column extending into a pile cap. The cabled stayed spans are supported on a 45 metre high steel H Pylon supported by a reinforced concrete pile cap on bored piles.