Bridges

A new pedestrian and bicycle bridge, the Bridge of Remembrance (BoR), now links two of Hobartís most significant places of remembrance ñ the Cenotaph and Soldiers Memorial Avenue on the Queens Domain, with its trees and plaques honouring World War I soldiers. The design team for the bridge comprised Arup and architects Denton Corker Marshall (DCM) who worked closely to document the bridge and support the fabrication and construction which was undertaken by Haywards and Fulton Hogan. The bridge comprises a hybrid three span continuous form based on a structural steel box girder deck combined with a hidden steel truss inside the wing.

These rotate 180° along the length of the bridge, varying the structural depth to match the bridge forces. To develop the design a 3d parametric model was developed in Rhino Grasshopper to enable rapid re-definition of the analysis model and optimise the design of the unique structure. This allowed detailed investigation of the rate of rotation of the wings, spacing of the truss members, rain flow run off from the wings, and development of a modular structure to optimise fabrication.

Once the overall form of the bridge was established the Rhino model was extended to develop construction documentation, transportation limits and visualisations of the bridge structure. This paper will focus on using a single source of truth across the duration of a project to ensure alignment of the design, documentation and fabrication of a complex steel structure. It will also discuss the differing requirements of a 3d cad model for documentation compared to the requirements of the 3d analysis model for bridge design.